3154 lines
70 KiB
Rust
3154 lines
70 KiB
Rust
use expect_test::expect;
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use test_utils::mark;
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use super::{check_infer, check_infer_with_mismatches, check_types};
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#[test]
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fn infer_await() {
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check_types(
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r#"
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//- /main.rs crate:main deps:core
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struct IntFuture;
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impl Future for IntFuture {
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type Output = u64;
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}
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fn test() {
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let r = IntFuture;
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let v = r.await;
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v;
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} //^ u64
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//- /core.rs crate:core
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#[prelude_import] use future::*;
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mod future {
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#[lang = "future_trait"]
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trait Future {
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type Output;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_async() {
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check_types(
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r#"
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//- /main.rs crate:main deps:core
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async fn foo() -> u64 {
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128
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}
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fn test() {
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let r = foo();
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let v = r.await;
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v;
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} //^ u64
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//- /core.rs crate:core
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#[prelude_import] use future::*;
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mod future {
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#[lang = "future_trait"]
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trait Future {
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type Output;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_desugar_async() {
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check_types(
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r#"
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//- /main.rs crate:main deps:core
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async fn foo() -> u64 {
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128
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}
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fn test() {
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let r = foo();
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r;
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} //^ impl Future<Output = u64>
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//- /core.rs crate:core
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#[prelude_import] use future::*;
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mod future {
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trait Future {
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type Output;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_async_block() {
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check_types(
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r#"
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//- /main.rs crate:main deps:core
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async fn test() {
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let a = async { 42 };
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a;
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// ^ impl Future<Output = i32>
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let x = a.await;
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x;
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// ^ i32
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let b = async {}.await;
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b;
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// ^ ()
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let c = async {
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let y = Option::None;
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y
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// ^ Option<u64>
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};
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let _: Option<u64> = c.await;
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c;
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// ^ impl Future<Output = Option<u64>>
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}
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enum Option<T> { None, Some(T) }
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//- /core.rs crate:core
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#[prelude_import] use future::*;
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mod future {
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#[lang = "future_trait"]
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trait Future {
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type Output;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_try() {
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check_types(
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r#"
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//- /main.rs crate:main deps:core
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fn test() {
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let r: Result<i32, u64> = Result::Ok(1);
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let v = r?;
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v;
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} //^ i32
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//- /core.rs crate:core
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#[prelude_import] use ops::*;
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mod ops {
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trait Try {
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type Ok;
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type Error;
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}
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}
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#[prelude_import] use result::*;
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mod result {
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enum Result<O, E> {
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Ok(O),
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Err(E)
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}
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impl<O, E> crate::ops::Try for Result<O, E> {
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type Ok = O;
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type Error = E;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_for_loop() {
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check_types(
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r#"
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//- /main.rs crate:main deps:core,alloc
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use alloc::collections::Vec;
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fn test() {
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let v = Vec::new();
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v.push("foo");
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for x in v {
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x;
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} //^ &str
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}
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//- /core.rs crate:core
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#[prelude_import] use iter::*;
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mod iter {
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trait IntoIterator {
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type Item;
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}
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}
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//- /alloc.rs crate:alloc deps:core
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mod collections {
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struct Vec<T> {}
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impl<T> Vec<T> {
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fn new() -> Self { Vec {} }
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fn push(&mut self, t: T) { }
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}
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impl<T> IntoIterator for Vec<T> {
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type Item=T;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_ops_neg() {
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check_types(
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r#"
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//- /main.rs crate:main deps:std
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struct Bar;
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struct Foo;
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impl std::ops::Neg for Bar {
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type Output = Foo;
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}
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fn test() {
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let a = Bar;
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let b = -a;
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b;
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} //^ Foo
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//- /std.rs crate:std
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#[prelude_import] use ops::*;
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mod ops {
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#[lang = "neg"]
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pub trait Neg {
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type Output;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_ops_not() {
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check_types(
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r#"
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//- /main.rs crate:main deps:std
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struct Bar;
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struct Foo;
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impl std::ops::Not for Bar {
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type Output = Foo;
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}
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fn test() {
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let a = Bar;
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let b = !a;
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b;
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} //^ Foo
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//- /std.rs crate:std
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#[prelude_import] use ops::*;
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mod ops {
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#[lang = "not"]
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pub trait Not {
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type Output;
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}
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}
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"#,
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);
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}
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#[test]
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fn infer_from_bound_1() {
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check_infer(
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r#"
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trait Trait<T> {}
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struct S<T>(T);
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impl<U> Trait<U> for S<U> {}
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fn foo<T: Trait<u32>>(t: T) {}
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fn test() {
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let s = S(unknown);
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foo(s);
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}
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"#,
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expect![[r#"
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85..86 't': T
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91..93 '{}': ()
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104..143 '{ ...(s); }': ()
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114..115 's': S<u32>
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118..119 'S': S<u32>(u32) -> S<u32>
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118..128 'S(unknown)': S<u32>
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120..127 'unknown': u32
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134..137 'foo': fn foo<S<u32>>(S<u32>)
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134..140 'foo(s)': ()
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138..139 's': S<u32>
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"#]],
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);
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}
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#[test]
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fn infer_from_bound_2() {
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check_infer(
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r#"
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trait Trait<T> {}
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struct S<T>(T);
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impl<U> Trait<U> for S<U> {}
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fn foo<U, T: Trait<U>>(t: T) -> U {}
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fn test() {
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let s = S(unknown);
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let x: u32 = foo(s);
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}
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"#,
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expect![[r#"
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86..87 't': T
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97..99 '{}': ()
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110..162 '{ ...(s); }': ()
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120..121 's': S<u32>
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124..125 'S': S<u32>(u32) -> S<u32>
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124..134 'S(unknown)': S<u32>
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126..133 'unknown': u32
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144..145 'x': u32
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153..156 'foo': fn foo<u32, S<u32>>(S<u32>) -> u32
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153..159 'foo(s)': u32
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157..158 's': S<u32>
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"#]],
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);
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}
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#[test]
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fn trait_default_method_self_bound_implements_trait() {
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mark::check!(trait_self_implements_self);
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check_infer(
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r#"
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trait Trait {
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fn foo(&self) -> i64;
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fn bar(&self) -> {
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let x = self.foo();
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}
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}
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"#,
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expect![[r#"
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26..30 'self': &Self
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52..56 'self': &Self
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61..96 '{ ... }': ()
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75..76 'x': i64
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79..83 'self': &Self
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79..89 'self.foo()': i64
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"#]],
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);
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}
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#[test]
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fn trait_default_method_self_bound_implements_super_trait() {
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check_infer(
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r#"
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trait SuperTrait {
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fn foo(&self) -> i64;
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}
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trait Trait: SuperTrait {
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fn bar(&self) -> {
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let x = self.foo();
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}
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}
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"#,
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expect![[r#"
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31..35 'self': &Self
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85..89 'self': &Self
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94..129 '{ ... }': ()
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108..109 'x': i64
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112..116 'self': &Self
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112..122 'self.foo()': i64
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"#]],
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);
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}
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#[test]
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fn infer_project_associated_type() {
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check_infer(
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r#"
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trait Iterable {
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type Item;
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}
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struct S;
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impl Iterable for S { type Item = u32; }
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fn test<T: Iterable>() {
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let x: <S as Iterable>::Item = 1;
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let y: <T as Iterable>::Item = no_matter;
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let z: T::Item = no_matter;
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let a: <T>::Item = no_matter;
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}
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"#,
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expect![[r#"
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108..261 '{ ...ter; }': ()
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118..119 'x': u32
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145..146 '1': u32
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156..157 'y': Iterable::Item<T>
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183..192 'no_matter': Iterable::Item<T>
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202..203 'z': Iterable::Item<T>
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215..224 'no_matter': Iterable::Item<T>
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234..235 'a': Iterable::Item<T>
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249..258 'no_matter': Iterable::Item<T>
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"#]],
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);
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}
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#[test]
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fn infer_return_associated_type() {
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check_infer(
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r#"
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trait Iterable {
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type Item;
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}
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struct S;
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impl Iterable for S { type Item = u32; }
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fn foo1<T: Iterable>(t: T) -> T::Item {}
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fn foo2<T: Iterable>(t: T) -> <T as Iterable>::Item {}
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fn foo3<T: Iterable>(t: T) -> <T>::Item {}
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fn test() {
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let x = foo1(S);
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let y = foo2(S);
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let z = foo3(S);
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}
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"#,
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expect![[r#"
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106..107 't': T
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123..125 '{}': ()
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147..148 't': T
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178..180 '{}': ()
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|
202..203 't': T
|
|
221..223 '{}': ()
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|
234..300 '{ ...(S); }': ()
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244..245 'x': u32
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248..252 'foo1': fn foo1<S>(S) -> <S as Iterable>::Item
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248..255 'foo1(S)': u32
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253..254 'S': S
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265..266 'y': u32
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269..273 'foo2': fn foo2<S>(S) -> <S as Iterable>::Item
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269..276 'foo2(S)': u32
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274..275 'S': S
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286..287 'z': u32
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290..294 'foo3': fn foo3<S>(S) -> <S as Iterable>::Item
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290..297 'foo3(S)': u32
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295..296 'S': S
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"#]],
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);
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}
|
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#[test]
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fn infer_associated_type_bound() {
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check_infer(
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r#"
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|
trait Iterable {
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type Item;
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}
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fn test<T: Iterable<Item=u32>>() {
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let y: T::Item = unknown;
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}
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"#,
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expect![[r#"
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|
67..100 '{ ...own; }': ()
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77..78 'y': u32
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90..97 'unknown': u32
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"#]],
|
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);
|
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}
|
|
|
|
#[test]
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fn infer_const_body() {
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check_infer(
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r#"
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const A: u32 = 1 + 1;
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static B: u64 = { let x = 1; x };
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"#,
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expect![[r#"
|
|
15..16 '1': u32
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|
15..20 '1 + 1': u32
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|
19..20 '1': u32
|
|
38..54 '{ let ...1; x }': u64
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44..45 'x': u64
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|
48..49 '1': u64
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|
51..52 'x': u64
|
|
"#]],
|
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);
|
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}
|
|
|
|
#[test]
|
|
fn tuple_struct_fields() {
|
|
check_infer(
|
|
r#"
|
|
struct S(i32, u64);
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|
fn test() -> u64 {
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|
let a = S(4, 6);
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|
let b = a.0;
|
|
a.1
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
37..86 '{ ... a.1 }': u64
|
|
47..48 'a': S
|
|
51..52 'S': S(i32, u64) -> S
|
|
51..58 'S(4, 6)': S
|
|
53..54 '4': i32
|
|
56..57 '6': u64
|
|
68..69 'b': i32
|
|
72..73 'a': S
|
|
72..75 'a.0': i32
|
|
81..82 'a': S
|
|
81..84 'a.1': u64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn tuple_struct_with_fn() {
|
|
check_infer(
|
|
r#"
|
|
struct S(fn(u32) -> u64);
|
|
fn test() -> u64 {
|
|
let a = S(|i| 2*i);
|
|
let b = a.0(4);
|
|
a.0(2)
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
43..101 '{ ...0(2) }': u64
|
|
53..54 'a': S
|
|
57..58 'S': S(fn(u32) -> u64) -> S
|
|
57..67 'S(|i| 2*i)': S
|
|
59..66 '|i| 2*i': |u32| -> u64
|
|
60..61 'i': u32
|
|
63..64 '2': u32
|
|
63..66 '2*i': u32
|
|
65..66 'i': u32
|
|
77..78 'b': u64
|
|
81..82 'a': S
|
|
81..84 'a.0': fn(u32) -> u64
|
|
81..87 'a.0(4)': u64
|
|
85..86 '4': u32
|
|
93..94 'a': S
|
|
93..96 'a.0': fn(u32) -> u64
|
|
93..99 'a.0(2)': u64
|
|
97..98 '2': u32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn indexing_arrays() {
|
|
check_infer(
|
|
"fn main() { &mut [9][2]; }",
|
|
expect![[r#"
|
|
10..26 '{ &mut...[2]; }': ()
|
|
12..23 '&mut [9][2]': &mut {unknown}
|
|
17..20 '[9]': [i32; _]
|
|
17..23 '[9][2]': {unknown}
|
|
18..19 '9': i32
|
|
21..22 '2': i32
|
|
"#]],
|
|
)
|
|
}
|
|
|
|
#[test]
|
|
fn infer_ops_index() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs crate:main deps:std
|
|
struct Bar;
|
|
struct Foo;
|
|
|
|
impl std::ops::Index<u32> for Bar {
|
|
type Output = Foo;
|
|
}
|
|
|
|
fn test() {
|
|
let a = Bar;
|
|
let b = a[1u32];
|
|
b;
|
|
} //^ Foo
|
|
|
|
//- /std.rs crate:std
|
|
#[prelude_import] use ops::*;
|
|
mod ops {
|
|
#[lang = "index"]
|
|
pub trait Index<Idx> {
|
|
type Output;
|
|
}
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_ops_index_int() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs crate:main deps:std
|
|
struct Bar;
|
|
struct Foo;
|
|
|
|
impl std::ops::Index<u32> for Bar {
|
|
type Output = Foo;
|
|
}
|
|
|
|
struct Range;
|
|
impl std::ops::Index<Range> for Bar {
|
|
type Output = Bar;
|
|
}
|
|
|
|
fn test() {
|
|
let a = Bar;
|
|
let b = a[1];
|
|
b;
|
|
//^ Foo
|
|
}
|
|
|
|
//- /std.rs crate:std
|
|
#[prelude_import] use ops::*;
|
|
mod ops {
|
|
#[lang = "index"]
|
|
pub trait Index<Idx> {
|
|
type Output;
|
|
}
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_ops_index_autoderef() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs crate:main deps:std
|
|
fn test() {
|
|
let a = &[1u32, 2, 3];
|
|
let b = a[1u32];
|
|
b;
|
|
} //^ u32
|
|
|
|
//- /std.rs crate:std
|
|
impl<T> ops::Index<u32> for [T] {
|
|
type Output = T;
|
|
}
|
|
|
|
#[prelude_import] use ops::*;
|
|
mod ops {
|
|
#[lang = "index"]
|
|
pub trait Index<Idx> {
|
|
type Output;
|
|
}
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn deref_trait() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
fn deref(&self) -> &Self::Target;
|
|
}
|
|
|
|
struct Arc<T>;
|
|
impl<T> Deref for Arc<T> {
|
|
type Target = T;
|
|
}
|
|
|
|
struct S;
|
|
impl S {
|
|
fn foo(&self) -> u128 {}
|
|
}
|
|
|
|
fn test(s: Arc<S>) {
|
|
(*s, s.foo());
|
|
} //^ (S, u128)
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn deref_trait_with_inference_var() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
fn deref(&self) -> &Self::Target;
|
|
}
|
|
|
|
struct Arc<T>;
|
|
fn new_arc<T>() -> Arc<T> {}
|
|
impl<T> Deref for Arc<T> {
|
|
type Target = T;
|
|
}
|
|
|
|
struct S;
|
|
fn foo(a: Arc<S>) {}
|
|
|
|
fn test() {
|
|
let a = new_arc();
|
|
let b = (*a);
|
|
//^ S
|
|
foo(a);
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn deref_trait_infinite_recursion() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
fn deref(&self) -> &Self::Target;
|
|
}
|
|
|
|
struct S;
|
|
|
|
impl Deref for S {
|
|
type Target = S;
|
|
}
|
|
|
|
fn test(s: S) {
|
|
s.foo();
|
|
} //^ {unknown}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn deref_trait_with_question_mark_size() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
fn deref(&self) -> &Self::Target;
|
|
}
|
|
|
|
struct Arc<T>;
|
|
impl<T> Deref for Arc<T> {
|
|
type Target = T;
|
|
}
|
|
|
|
struct S;
|
|
impl S {
|
|
fn foo(&self) -> u128 {}
|
|
}
|
|
|
|
fn test(s: Arc<S>) {
|
|
(*s, s.foo());
|
|
} //^ (S, u128)
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn obligation_from_function_clause() {
|
|
check_types(
|
|
r#"
|
|
struct S;
|
|
|
|
trait Trait<T> {}
|
|
impl Trait<u32> for S {}
|
|
|
|
fn foo<T: Trait<U>, U>(t: T) -> U {}
|
|
|
|
fn test(s: S) {
|
|
(foo(s));
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn obligation_from_method_clause() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs
|
|
struct S;
|
|
|
|
trait Trait<T> {}
|
|
impl Trait<isize> for S {}
|
|
|
|
struct O;
|
|
impl O {
|
|
fn foo<T: Trait<U>, U>(&self, t: T) -> U {}
|
|
}
|
|
|
|
fn test() {
|
|
O.foo(S);
|
|
} //^ isize
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn obligation_from_self_method_clause() {
|
|
check_types(
|
|
r#"
|
|
struct S;
|
|
|
|
trait Trait<T> {}
|
|
impl Trait<i64> for S {}
|
|
|
|
impl S {
|
|
fn foo<U>(&self) -> U where Self: Trait<U> {}
|
|
}
|
|
|
|
fn test() {
|
|
S.foo();
|
|
} //^ i64
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn obligation_from_impl_clause() {
|
|
check_types(
|
|
r#"
|
|
struct S;
|
|
|
|
trait Trait<T> {}
|
|
impl Trait<&str> for S {}
|
|
|
|
struct O<T>;
|
|
impl<U, T: Trait<U>> O<T> {
|
|
fn foo(&self) -> U {}
|
|
}
|
|
|
|
fn test(o: O<S>) {
|
|
o.foo();
|
|
} //^ &str
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn generic_param_env_1() {
|
|
check_types(
|
|
r#"
|
|
trait Clone {}
|
|
trait Trait { fn foo(self) -> u128; }
|
|
struct S;
|
|
impl Clone for S {}
|
|
impl<T> Trait for T where T: Clone {}
|
|
fn test<T: Clone>(t: T) { t.foo(); }
|
|
//^ u128
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn generic_param_env_1_not_met() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs
|
|
trait Clone {}
|
|
trait Trait { fn foo(self) -> u128; }
|
|
struct S;
|
|
impl Clone for S {}
|
|
impl<T> Trait for T where T: Clone {}
|
|
fn test<T>(t: T) { t.foo(); }
|
|
//^ {unknown}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn generic_param_env_2() {
|
|
check_types(
|
|
r#"
|
|
trait Trait { fn foo(self) -> u128; }
|
|
struct S;
|
|
impl Trait for S {}
|
|
fn test<T: Trait>(t: T) { t.foo(); }
|
|
//^ u128
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn generic_param_env_2_not_met() {
|
|
check_types(
|
|
r#"
|
|
trait Trait { fn foo(self) -> u128; }
|
|
struct S;
|
|
impl Trait for S {}
|
|
fn test<T>(t: T) { t.foo(); }
|
|
//^ {unknown}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn generic_param_env_deref() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
}
|
|
trait Trait {}
|
|
impl<T> Deref for T where T: Trait {
|
|
type Target = i128;
|
|
}
|
|
fn test<T: Trait>(t: T) { (*t); }
|
|
//^ i128
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn associated_type_placeholder() {
|
|
// inside the generic function, the associated type gets normalized to a placeholder `ApplL::Out<T>` [https://rust-lang.github.io/rustc-guide/traits/associated-types.html#placeholder-associated-types].
|
|
check_types(
|
|
r#"
|
|
pub trait ApplyL {
|
|
type Out;
|
|
}
|
|
|
|
pub struct RefMutL<T>;
|
|
|
|
impl<T> ApplyL for RefMutL<T> {
|
|
type Out = <T as ApplyL>::Out;
|
|
}
|
|
|
|
fn test<T: ApplyL>() {
|
|
let y: <RefMutL<T> as ApplyL>::Out = no_matter;
|
|
y;
|
|
} //^ ApplyL::Out<T>
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn associated_type_placeholder_2() {
|
|
check_types(
|
|
r#"
|
|
pub trait ApplyL {
|
|
type Out;
|
|
}
|
|
fn foo<T: ApplyL>(t: T) -> <T as ApplyL>::Out;
|
|
|
|
fn test<T: ApplyL>(t: T) {
|
|
let y = foo(t);
|
|
y;
|
|
} //^ ApplyL::Out<T>
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn argument_impl_trait() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
trait Trait<T> {
|
|
fn foo(&self) -> T;
|
|
fn foo2(&self) -> i64;
|
|
}
|
|
fn bar(x: impl Trait<u16>) {}
|
|
struct S<T>(T);
|
|
impl<T> Trait<T> for S<T> {}
|
|
|
|
fn test(x: impl Trait<u64>, y: &impl Trait<u32>) {
|
|
x;
|
|
y;
|
|
let z = S(1);
|
|
bar(z);
|
|
x.foo();
|
|
y.foo();
|
|
z.foo();
|
|
x.foo2();
|
|
y.foo2();
|
|
z.foo2();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
29..33 'self': &Self
|
|
54..58 'self': &Self
|
|
77..78 'x': impl Trait<u16>
|
|
97..99 '{}': ()
|
|
154..155 'x': impl Trait<u64>
|
|
174..175 'y': &impl Trait<u32>
|
|
195..323 '{ ...2(); }': ()
|
|
201..202 'x': impl Trait<u64>
|
|
208..209 'y': &impl Trait<u32>
|
|
219..220 'z': S<u16>
|
|
223..224 'S': S<u16>(u16) -> S<u16>
|
|
223..227 'S(1)': S<u16>
|
|
225..226 '1': u16
|
|
233..236 'bar': fn bar(S<u16>)
|
|
233..239 'bar(z)': ()
|
|
237..238 'z': S<u16>
|
|
245..246 'x': impl Trait<u64>
|
|
245..252 'x.foo()': u64
|
|
258..259 'y': &impl Trait<u32>
|
|
258..265 'y.foo()': u32
|
|
271..272 'z': S<u16>
|
|
271..278 'z.foo()': u16
|
|
284..285 'x': impl Trait<u64>
|
|
284..292 'x.foo2()': i64
|
|
298..299 'y': &impl Trait<u32>
|
|
298..306 'y.foo2()': i64
|
|
312..313 'z': S<u16>
|
|
312..320 'z.foo2()': i64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn argument_impl_trait_type_args_1() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
trait Trait {}
|
|
trait Foo {
|
|
// this function has an implicit Self param, an explicit type param,
|
|
// and an implicit impl Trait param!
|
|
fn bar<T>(x: impl Trait) -> T { loop {} }
|
|
}
|
|
fn foo<T>(x: impl Trait) -> T { loop {} }
|
|
struct S;
|
|
impl Trait for S {}
|
|
struct F;
|
|
impl Foo for F {}
|
|
|
|
fn test() {
|
|
Foo::bar(S);
|
|
<F as Foo>::bar(S);
|
|
F::bar(S);
|
|
Foo::bar::<u32>(S);
|
|
<F as Foo>::bar::<u32>(S);
|
|
|
|
foo(S);
|
|
foo::<u32>(S);
|
|
foo::<u32, i32>(S); // we should ignore the extraneous i32
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
155..156 'x': impl Trait
|
|
175..186 '{ loop {} }': T
|
|
177..184 'loop {}': !
|
|
182..184 '{}': ()
|
|
199..200 'x': impl Trait
|
|
219..230 '{ loop {} }': T
|
|
221..228 'loop {}': !
|
|
226..228 '{}': ()
|
|
300..509 '{ ... i32 }': ()
|
|
306..314 'Foo::bar': fn bar<{unknown}, {unknown}>(S) -> {unknown}
|
|
306..317 'Foo::bar(S)': {unknown}
|
|
315..316 'S': S
|
|
323..338 '<F as Foo>::bar': fn bar<F, {unknown}>(S) -> {unknown}
|
|
323..341 '<F as ...bar(S)': {unknown}
|
|
339..340 'S': S
|
|
347..353 'F::bar': fn bar<F, {unknown}>(S) -> {unknown}
|
|
347..356 'F::bar(S)': {unknown}
|
|
354..355 'S': S
|
|
362..377 'Foo::bar::<u32>': fn bar<{unknown}, u32>(S) -> u32
|
|
362..380 'Foo::b...32>(S)': u32
|
|
378..379 'S': S
|
|
386..408 '<F as ...:<u32>': fn bar<F, u32>(S) -> u32
|
|
386..411 '<F as ...32>(S)': u32
|
|
409..410 'S': S
|
|
418..421 'foo': fn foo<{unknown}>(S) -> {unknown}
|
|
418..424 'foo(S)': {unknown}
|
|
422..423 'S': S
|
|
430..440 'foo::<u32>': fn foo<u32>(S) -> u32
|
|
430..443 'foo::<u32>(S)': u32
|
|
441..442 'S': S
|
|
449..464 'foo::<u32, i32>': fn foo<u32>(S) -> u32
|
|
449..467 'foo::<...32>(S)': u32
|
|
465..466 'S': S
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn argument_impl_trait_type_args_2() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
trait Trait {}
|
|
struct S;
|
|
impl Trait for S {}
|
|
struct F<T>;
|
|
impl<T> F<T> {
|
|
fn foo<U>(self, x: impl Trait) -> (T, U) { loop {} }
|
|
}
|
|
|
|
fn test() {
|
|
F.foo(S);
|
|
F::<u32>.foo(S);
|
|
F::<u32>.foo::<i32>(S);
|
|
F::<u32>.foo::<i32, u32>(S); // extraneous argument should be ignored
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
87..91 'self': F<T>
|
|
93..94 'x': impl Trait
|
|
118..129 '{ loop {} }': (T, U)
|
|
120..127 'loop {}': !
|
|
125..127 '{}': ()
|
|
143..283 '{ ...ored }': ()
|
|
149..150 'F': F<{unknown}>
|
|
149..157 'F.foo(S)': ({unknown}, {unknown})
|
|
155..156 'S': S
|
|
163..171 'F::<u32>': F<u32>
|
|
163..178 'F::<u32>.foo(S)': (u32, {unknown})
|
|
176..177 'S': S
|
|
184..192 'F::<u32>': F<u32>
|
|
184..206 'F::<u3...32>(S)': (u32, i32)
|
|
204..205 'S': S
|
|
212..220 'F::<u32>': F<u32>
|
|
212..239 'F::<u3...32>(S)': (u32, i32)
|
|
237..238 'S': S
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn argument_impl_trait_to_fn_pointer() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
trait Trait {}
|
|
fn foo(x: impl Trait) { loop {} }
|
|
struct S;
|
|
impl Trait for S {}
|
|
|
|
fn test() {
|
|
let f: fn(S) -> () = foo;
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
22..23 'x': impl Trait
|
|
37..48 '{ loop {} }': ()
|
|
39..46 'loop {}': !
|
|
44..46 '{}': ()
|
|
90..123 '{ ...foo; }': ()
|
|
100..101 'f': fn(S)
|
|
117..120 'foo': fn foo(S)
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn impl_trait() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait<T> {
|
|
fn foo(&self) -> T;
|
|
fn foo2(&self) -> i64;
|
|
}
|
|
fn bar() -> impl Trait<u64> {}
|
|
|
|
fn test(x: impl Trait<u64>, y: &impl Trait<u64>) {
|
|
x;
|
|
y;
|
|
let z = bar();
|
|
x.foo();
|
|
y.foo();
|
|
z.foo();
|
|
x.foo2();
|
|
y.foo2();
|
|
z.foo2();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
29..33 'self': &Self
|
|
54..58 'self': &Self
|
|
98..100 '{}': ()
|
|
110..111 'x': impl Trait<u64>
|
|
130..131 'y': &impl Trait<u64>
|
|
151..268 '{ ...2(); }': ()
|
|
157..158 'x': impl Trait<u64>
|
|
164..165 'y': &impl Trait<u64>
|
|
175..176 'z': impl Trait<u64>
|
|
179..182 'bar': fn bar() -> impl Trait<u64>
|
|
179..184 'bar()': impl Trait<u64>
|
|
190..191 'x': impl Trait<u64>
|
|
190..197 'x.foo()': u64
|
|
203..204 'y': &impl Trait<u64>
|
|
203..210 'y.foo()': u64
|
|
216..217 'z': impl Trait<u64>
|
|
216..223 'z.foo()': u64
|
|
229..230 'x': impl Trait<u64>
|
|
229..237 'x.foo2()': i64
|
|
243..244 'y': &impl Trait<u64>
|
|
243..251 'y.foo2()': i64
|
|
257..258 'z': impl Trait<u64>
|
|
257..265 'z.foo2()': i64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn simple_return_pos_impl_trait() {
|
|
mark::check!(lower_rpit);
|
|
check_infer(
|
|
r#"
|
|
trait Trait<T> {
|
|
fn foo(&self) -> T;
|
|
}
|
|
fn bar() -> impl Trait<u64> { loop {} }
|
|
|
|
fn test() {
|
|
let a = bar();
|
|
a.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
29..33 'self': &Self
|
|
71..82 '{ loop {} }': !
|
|
73..80 'loop {}': !
|
|
78..80 '{}': ()
|
|
94..129 '{ ...o(); }': ()
|
|
104..105 'a': impl Trait<u64>
|
|
108..111 'bar': fn bar() -> impl Trait<u64>
|
|
108..113 'bar()': impl Trait<u64>
|
|
119..120 'a': impl Trait<u64>
|
|
119..126 'a.foo()': u64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn more_return_pos_impl_trait() {
|
|
check_infer(
|
|
r#"
|
|
trait Iterator {
|
|
type Item;
|
|
fn next(&mut self) -> Self::Item;
|
|
}
|
|
trait Trait<T> {
|
|
fn foo(&self) -> T;
|
|
}
|
|
fn bar() -> (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>) { loop {} }
|
|
fn baz<T>(t: T) -> (impl Iterator<Item = impl Trait<T>>, impl Trait<T>) { loop {} }
|
|
|
|
fn test() {
|
|
let (a, b) = bar();
|
|
a.next().foo();
|
|
b.foo();
|
|
let (c, d) = baz(1u128);
|
|
c.next().foo();
|
|
d.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
49..53 'self': &mut Self
|
|
101..105 'self': &Self
|
|
184..195 '{ loop {} }': ({unknown}, {unknown})
|
|
186..193 'loop {}': !
|
|
191..193 '{}': ()
|
|
206..207 't': T
|
|
268..279 '{ loop {} }': ({unknown}, {unknown})
|
|
270..277 'loop {}': !
|
|
275..277 '{}': ()
|
|
291..413 '{ ...o(); }': ()
|
|
301..307 '(a, b)': (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>)
|
|
302..303 'a': impl Iterator<Item = impl Trait<u32>>
|
|
305..306 'b': impl Trait<u64>
|
|
310..313 'bar': fn bar() -> (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>)
|
|
310..315 'bar()': (impl Iterator<Item = impl Trait<u32>>, impl Trait<u64>)
|
|
321..322 'a': impl Iterator<Item = impl Trait<u32>>
|
|
321..329 'a.next()': impl Trait<u32>
|
|
321..335 'a.next().foo()': u32
|
|
341..342 'b': impl Trait<u64>
|
|
341..348 'b.foo()': u64
|
|
358..364 '(c, d)': (impl Iterator<Item = impl Trait<u128>>, impl Trait<u128>)
|
|
359..360 'c': impl Iterator<Item = impl Trait<u128>>
|
|
362..363 'd': impl Trait<u128>
|
|
367..370 'baz': fn baz<u128>(u128) -> (impl Iterator<Item = impl Trait<u128>>, impl Trait<u128>)
|
|
367..377 'baz(1u128)': (impl Iterator<Item = impl Trait<u128>>, impl Trait<u128>)
|
|
371..376 '1u128': u128
|
|
383..384 'c': impl Iterator<Item = impl Trait<u128>>
|
|
383..391 'c.next()': impl Trait<u128>
|
|
383..397 'c.next().foo()': u128
|
|
403..404 'd': impl Trait<u128>
|
|
403..410 'd.foo()': u128
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn dyn_trait() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait<T> {
|
|
fn foo(&self) -> T;
|
|
fn foo2(&self) -> i64;
|
|
}
|
|
fn bar() -> dyn Trait<u64> {}
|
|
|
|
fn test(x: dyn Trait<u64>, y: &dyn Trait<u64>) {
|
|
x;
|
|
y;
|
|
let z = bar();
|
|
x.foo();
|
|
y.foo();
|
|
z.foo();
|
|
x.foo2();
|
|
y.foo2();
|
|
z.foo2();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
29..33 'self': &Self
|
|
54..58 'self': &Self
|
|
97..99 '{}': ()
|
|
109..110 'x': dyn Trait<u64>
|
|
128..129 'y': &dyn Trait<u64>
|
|
148..265 '{ ...2(); }': ()
|
|
154..155 'x': dyn Trait<u64>
|
|
161..162 'y': &dyn Trait<u64>
|
|
172..173 'z': dyn Trait<u64>
|
|
176..179 'bar': fn bar() -> dyn Trait<u64>
|
|
176..181 'bar()': dyn Trait<u64>
|
|
187..188 'x': dyn Trait<u64>
|
|
187..194 'x.foo()': u64
|
|
200..201 'y': &dyn Trait<u64>
|
|
200..207 'y.foo()': u64
|
|
213..214 'z': dyn Trait<u64>
|
|
213..220 'z.foo()': u64
|
|
226..227 'x': dyn Trait<u64>
|
|
226..234 'x.foo2()': i64
|
|
240..241 'y': &dyn Trait<u64>
|
|
240..248 'y.foo2()': i64
|
|
254..255 'z': dyn Trait<u64>
|
|
254..262 'z.foo2()': i64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn dyn_trait_in_impl() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait<T, U> {
|
|
fn foo(&self) -> (T, U);
|
|
}
|
|
struct S<T, U> {}
|
|
impl<T, U> S<T, U> {
|
|
fn bar(&self) -> &dyn Trait<T, U> { loop {} }
|
|
}
|
|
trait Trait2<T, U> {
|
|
fn baz(&self) -> (T, U);
|
|
}
|
|
impl<T, U> Trait2<T, U> for dyn Trait<T, U> { }
|
|
|
|
fn test(s: S<u32, i32>) {
|
|
s.bar().baz();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
32..36 'self': &Self
|
|
102..106 'self': &S<T, U>
|
|
128..139 '{ loop {} }': &dyn Trait<T, U>
|
|
130..137 'loop {}': !
|
|
135..137 '{}': ()
|
|
175..179 'self': &Self
|
|
251..252 's': S<u32, i32>
|
|
267..289 '{ ...z(); }': ()
|
|
273..274 's': S<u32, i32>
|
|
273..280 's.bar()': &dyn Trait<u32, i32>
|
|
273..286 's.bar().baz()': (u32, i32)
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn dyn_trait_bare() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait {
|
|
fn foo(&self) -> u64;
|
|
}
|
|
fn bar() -> Trait {}
|
|
|
|
fn test(x: Trait, y: &Trait) -> u64 {
|
|
x;
|
|
y;
|
|
let z = bar();
|
|
x.foo();
|
|
y.foo();
|
|
z.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
26..30 'self': &Self
|
|
60..62 '{}': ()
|
|
72..73 'x': dyn Trait
|
|
82..83 'y': &dyn Trait
|
|
100..175 '{ ...o(); }': ()
|
|
106..107 'x': dyn Trait
|
|
113..114 'y': &dyn Trait
|
|
124..125 'z': dyn Trait
|
|
128..131 'bar': fn bar() -> dyn Trait
|
|
128..133 'bar()': dyn Trait
|
|
139..140 'x': dyn Trait
|
|
139..146 'x.foo()': u64
|
|
152..153 'y': &dyn Trait
|
|
152..159 'y.foo()': u64
|
|
165..166 'z': dyn Trait
|
|
165..172 'z.foo()': u64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn weird_bounds() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait {}
|
|
fn test(a: impl Trait + 'lifetime, b: impl 'lifetime, c: impl (Trait), d: impl ('lifetime), e: impl ?Sized, f: impl Trait + ?Sized) {}
|
|
"#,
|
|
expect![[r#"
|
|
23..24 'a': impl Trait + {error}
|
|
50..51 'b': impl {error}
|
|
69..70 'c': impl Trait
|
|
86..87 'd': impl {error}
|
|
107..108 'e': impl {error}
|
|
123..124 'f': impl Trait + {error}
|
|
147..149 '{}': ()
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
#[ignore]
|
|
fn error_bound_chalk() {
|
|
check_types(
|
|
r#"
|
|
trait Trait {
|
|
fn foo(&self) -> u32 {}
|
|
}
|
|
|
|
fn test(x: (impl Trait + UnknownTrait)) {
|
|
x.foo();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn assoc_type_bindings() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait {
|
|
type Type;
|
|
}
|
|
|
|
fn get<T: Trait>(t: T) -> <T as Trait>::Type {}
|
|
fn get2<U, T: Trait<Type = U>>(t: T) -> U {}
|
|
fn set<T: Trait<Type = u64>>(t: T) -> T {t}
|
|
|
|
struct S<T>;
|
|
impl<T> Trait for S<T> { type Type = T; }
|
|
|
|
fn test<T: Trait<Type = u32>>(x: T, y: impl Trait<Type = i64>) {
|
|
get(x);
|
|
get2(x);
|
|
get(y);
|
|
get2(y);
|
|
get(set(S));
|
|
get2(set(S));
|
|
get2(S::<str>);
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
49..50 't': T
|
|
77..79 '{}': ()
|
|
111..112 't': T
|
|
122..124 '{}': ()
|
|
154..155 't': T
|
|
165..168 '{t}': T
|
|
166..167 't': T
|
|
256..257 'x': T
|
|
262..263 'y': impl Trait<Type = i64>
|
|
289..397 '{ ...r>); }': ()
|
|
295..298 'get': fn get<T>(T) -> <T as Trait>::Type
|
|
295..301 'get(x)': u32
|
|
299..300 'x': T
|
|
307..311 'get2': fn get2<u32, T>(T) -> u32
|
|
307..314 'get2(x)': u32
|
|
312..313 'x': T
|
|
320..323 'get': fn get<impl Trait<Type = i64>>(impl Trait<Type = i64>) -> <impl Trait<Type = i64> as Trait>::Type
|
|
320..326 'get(y)': i64
|
|
324..325 'y': impl Trait<Type = i64>
|
|
332..336 'get2': fn get2<i64, impl Trait<Type = i64>>(impl Trait<Type = i64>) -> i64
|
|
332..339 'get2(y)': i64
|
|
337..338 'y': impl Trait<Type = i64>
|
|
345..348 'get': fn get<S<u64>>(S<u64>) -> <S<u64> as Trait>::Type
|
|
345..356 'get(set(S))': u64
|
|
349..352 'set': fn set<S<u64>>(S<u64>) -> S<u64>
|
|
349..355 'set(S)': S<u64>
|
|
353..354 'S': S<u64>
|
|
362..366 'get2': fn get2<u64, S<u64>>(S<u64>) -> u64
|
|
362..374 'get2(set(S))': u64
|
|
367..370 'set': fn set<S<u64>>(S<u64>) -> S<u64>
|
|
367..373 'set(S)': S<u64>
|
|
371..372 'S': S<u64>
|
|
380..384 'get2': fn get2<str, S<str>>(S<str>) -> str
|
|
380..394 'get2(S::<str>)': str
|
|
385..393 'S::<str>': S<str>
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn impl_trait_assoc_binding_projection_bug() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs crate:main deps:std
|
|
pub trait Language {
|
|
type Kind;
|
|
}
|
|
pub enum RustLanguage {}
|
|
impl Language for RustLanguage {
|
|
type Kind = SyntaxKind;
|
|
}
|
|
struct SyntaxNode<L> {}
|
|
fn foo() -> impl Iterator<Item = SyntaxNode<RustLanguage>> {}
|
|
|
|
trait Clone {
|
|
fn clone(&self) -> Self;
|
|
}
|
|
|
|
fn api_walkthrough() {
|
|
for node in foo() {
|
|
node.clone();
|
|
} //^ {unknown}
|
|
}
|
|
|
|
//- /std.rs crate:std
|
|
#[prelude_import] use iter::*;
|
|
mod iter {
|
|
trait IntoIterator {
|
|
type Item;
|
|
}
|
|
trait Iterator {
|
|
type Item;
|
|
}
|
|
impl<T: Iterator> IntoIterator for T {
|
|
type Item = <T as Iterator>::Item;
|
|
}
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn projection_eq_within_chalk() {
|
|
check_infer(
|
|
r#"
|
|
trait Trait1 {
|
|
type Type;
|
|
}
|
|
trait Trait2<T> {
|
|
fn foo(self) -> T;
|
|
}
|
|
impl<T, U> Trait2<T> for U where U: Trait1<Type = T> {}
|
|
|
|
fn test<T: Trait1<Type = u32>>(x: T) {
|
|
x.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
61..65 'self': Self
|
|
163..164 'x': T
|
|
169..185 '{ ...o(); }': ()
|
|
175..176 'x': T
|
|
175..182 'x.foo()': u32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn where_clause_trait_in_scope_for_method_resolution() {
|
|
check_types(
|
|
r#"
|
|
mod foo {
|
|
trait Trait {
|
|
fn foo(&self) -> u32 {}
|
|
}
|
|
}
|
|
|
|
fn test<T: foo::Trait>(x: T) {
|
|
x.foo();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn super_trait_method_resolution() {
|
|
check_infer(
|
|
r#"
|
|
mod foo {
|
|
trait SuperTrait {
|
|
fn foo(&self) -> u32 {}
|
|
}
|
|
}
|
|
trait Trait1: foo::SuperTrait {}
|
|
trait Trait2 where Self: foo::SuperTrait {}
|
|
|
|
fn test<T: Trait1, U: Trait2>(x: T, y: U) {
|
|
x.foo();
|
|
y.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
49..53 'self': &Self
|
|
62..64 '{}': ()
|
|
181..182 'x': T
|
|
187..188 'y': U
|
|
193..222 '{ ...o(); }': ()
|
|
199..200 'x': T
|
|
199..206 'x.foo()': u32
|
|
212..213 'y': U
|
|
212..219 'y.foo()': u32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn super_trait_impl_trait_method_resolution() {
|
|
check_infer(
|
|
r#"
|
|
mod foo {
|
|
trait SuperTrait {
|
|
fn foo(&self) -> u32 {}
|
|
}
|
|
}
|
|
trait Trait1: foo::SuperTrait {}
|
|
|
|
fn test(x: &impl Trait1) {
|
|
x.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
49..53 'self': &Self
|
|
62..64 '{}': ()
|
|
115..116 'x': &impl Trait1
|
|
132..148 '{ ...o(); }': ()
|
|
138..139 'x': &impl Trait1
|
|
138..145 'x.foo()': u32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn super_trait_cycle() {
|
|
// This just needs to not crash
|
|
check_infer(
|
|
r#"
|
|
trait A: B {}
|
|
trait B: A {}
|
|
|
|
fn test<T: A>(x: T) {
|
|
x.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
43..44 'x': T
|
|
49..65 '{ ...o(); }': ()
|
|
55..56 'x': T
|
|
55..62 'x.foo()': {unknown}
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn super_trait_assoc_type_bounds() {
|
|
check_infer(
|
|
r#"
|
|
trait SuperTrait { type Type; }
|
|
trait Trait where Self: SuperTrait {}
|
|
|
|
fn get2<U, T: Trait<Type = U>>(t: T) -> U {}
|
|
fn set<T: Trait<Type = u64>>(t: T) -> T {t}
|
|
|
|
struct S<T>;
|
|
impl<T> SuperTrait for S<T> { type Type = T; }
|
|
impl<T> Trait for S<T> {}
|
|
|
|
fn test() {
|
|
get2(set(S));
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
102..103 't': T
|
|
113..115 '{}': ()
|
|
145..146 't': T
|
|
156..159 '{t}': T
|
|
157..158 't': T
|
|
258..279 '{ ...S)); }': ()
|
|
264..268 'get2': fn get2<u64, S<u64>>(S<u64>) -> u64
|
|
264..276 'get2(set(S))': u64
|
|
269..272 'set': fn set<S<u64>>(S<u64>) -> S<u64>
|
|
269..275 'set(S)': S<u64>
|
|
273..274 'S': S<u64>
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn fn_trait() {
|
|
check_infer(
|
|
r#"
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
|
|
fn call_once(self, args: Args) -> <Self as FnOnce<Args>>::Output;
|
|
}
|
|
|
|
fn test<F: FnOnce(u32, u64) -> u128>(f: F) {
|
|
f.call_once((1, 2));
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
56..60 'self': Self
|
|
62..66 'args': Args
|
|
149..150 'f': F
|
|
155..183 '{ ...2)); }': ()
|
|
161..162 'f': F
|
|
161..180 'f.call...1, 2))': u128
|
|
173..179 '(1, 2)': (u32, u64)
|
|
174..175 '1': u32
|
|
177..178 '2': u64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn fn_ptr_and_item() {
|
|
check_infer(
|
|
r#"
|
|
#[lang="fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
|
|
fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
trait Foo<T> {
|
|
fn foo(&self) -> T;
|
|
}
|
|
|
|
struct Bar<T>(T);
|
|
|
|
impl<A1, R, F: FnOnce(A1) -> R> Foo<(A1, R)> for Bar<F> {
|
|
fn foo(&self) -> (A1, R) {}
|
|
}
|
|
|
|
enum Opt<T> { None, Some(T) }
|
|
impl<T> Opt<T> {
|
|
fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Opt<U> {}
|
|
}
|
|
|
|
fn test() {
|
|
let bar: Bar<fn(u8) -> u32>;
|
|
bar.foo();
|
|
|
|
let opt: Opt<u8>;
|
|
let f: fn(u8) -> u32;
|
|
opt.map(f);
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
74..78 'self': Self
|
|
80..84 'args': Args
|
|
139..143 'self': &Self
|
|
243..247 'self': &Bar<F>
|
|
260..262 '{}': ()
|
|
346..350 'self': Opt<T>
|
|
352..353 'f': F
|
|
368..370 '{}': ()
|
|
384..500 '{ ...(f); }': ()
|
|
394..397 'bar': Bar<fn(u8) -> u32>
|
|
423..426 'bar': Bar<fn(u8) -> u32>
|
|
423..432 'bar.foo()': (u8, u32)
|
|
443..446 'opt': Opt<u8>
|
|
465..466 'f': fn(u8) -> u32
|
|
487..490 'opt': Opt<u8>
|
|
487..497 'opt.map(f)': Opt<u32>
|
|
495..496 'f': fn(u8) -> u32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn fn_trait_deref_with_ty_default() {
|
|
check_infer(
|
|
r#"
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
|
|
fn deref(&self) -> &Self::Target;
|
|
}
|
|
|
|
#[lang="fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
|
|
fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
struct Foo;
|
|
|
|
impl Foo {
|
|
fn foo(&self) -> usize {}
|
|
}
|
|
|
|
struct Lazy<T, F = fn() -> T>(F);
|
|
|
|
impl<T, F> Lazy<T, F> {
|
|
pub fn new(f: F) -> Lazy<T, F> {}
|
|
}
|
|
|
|
impl<T, F: FnOnce() -> T> Deref for Lazy<T, F> {
|
|
type Target = T;
|
|
}
|
|
|
|
fn test() {
|
|
let lazy1: Lazy<Foo, _> = Lazy::new(|| Foo);
|
|
let r1 = lazy1.foo();
|
|
|
|
fn make_foo_fn() -> Foo {}
|
|
let make_foo_fn_ptr: fn() -> Foo = make_foo_fn;
|
|
let lazy2: Lazy<Foo, _> = Lazy::new(make_foo_fn_ptr);
|
|
let r2 = lazy2.foo();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
64..68 'self': &Self
|
|
165..169 'self': Self
|
|
171..175 'args': Args
|
|
239..243 'self': &Foo
|
|
254..256 '{}': ()
|
|
334..335 'f': F
|
|
354..356 '{}': ()
|
|
443..689 '{ ...o(); }': ()
|
|
453..458 'lazy1': Lazy<Foo, || -> Foo>
|
|
475..484 'Lazy::new': fn new<Foo, || -> Foo>(|| -> Foo) -> Lazy<Foo, || -> Foo>
|
|
475..492 'Lazy::...| Foo)': Lazy<Foo, || -> Foo>
|
|
485..491 '|| Foo': || -> Foo
|
|
488..491 'Foo': Foo
|
|
502..504 'r1': usize
|
|
507..512 'lazy1': Lazy<Foo, || -> Foo>
|
|
507..518 'lazy1.foo()': usize
|
|
560..575 'make_foo_fn_ptr': fn() -> Foo
|
|
591..602 'make_foo_fn': fn make_foo_fn() -> Foo
|
|
612..617 'lazy2': Lazy<Foo, fn() -> Foo>
|
|
634..643 'Lazy::new': fn new<Foo, fn() -> Foo>(fn() -> Foo) -> Lazy<Foo, fn() -> Foo>
|
|
634..660 'Lazy::...n_ptr)': Lazy<Foo, fn() -> Foo>
|
|
644..659 'make_foo_fn_ptr': fn() -> Foo
|
|
670..672 'r2': usize
|
|
675..680 'lazy2': Lazy<Foo, fn() -> Foo>
|
|
675..686 'lazy2.foo()': usize
|
|
549..551 '{}': ()
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn closure_1() {
|
|
check_infer(
|
|
r#"
|
|
#[lang = "fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
}
|
|
|
|
enum Option<T> { Some(T), None }
|
|
impl<T> Option<T> {
|
|
fn map<U, F: FnOnce(T) -> U>(self, f: F) -> Option<U> {}
|
|
}
|
|
|
|
fn test() {
|
|
let x = Option::Some(1u32);
|
|
x.map(|v| v + 1);
|
|
x.map(|_v| 1u64);
|
|
let y: Option<i64> = x.map(|_v| 1);
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
147..151 'self': Option<T>
|
|
153..154 'f': F
|
|
172..174 '{}': ()
|
|
188..307 '{ ... 1); }': ()
|
|
198..199 'x': Option<u32>
|
|
202..214 'Option::Some': Some<u32>(u32) -> Option<u32>
|
|
202..220 'Option...(1u32)': Option<u32>
|
|
215..219 '1u32': u32
|
|
226..227 'x': Option<u32>
|
|
226..242 'x.map(...v + 1)': Option<u32>
|
|
232..241 '|v| v + 1': |u32| -> u32
|
|
233..234 'v': u32
|
|
236..237 'v': u32
|
|
236..241 'v + 1': u32
|
|
240..241 '1': u32
|
|
248..249 'x': Option<u32>
|
|
248..264 'x.map(... 1u64)': Option<u64>
|
|
254..263 '|_v| 1u64': |u32| -> u64
|
|
255..257 '_v': u32
|
|
259..263 '1u64': u64
|
|
274..275 'y': Option<i64>
|
|
291..292 'x': Option<u32>
|
|
291..304 'x.map(|_v| 1)': Option<i64>
|
|
297..303 '|_v| 1': |u32| -> i64
|
|
298..300 '_v': u32
|
|
302..303 '1': i64
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn closure_2() {
|
|
check_infer(
|
|
r#"
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
}
|
|
|
|
fn test<F: FnOnce(u32) -> u64>(f: F) {
|
|
f(1);
|
|
let g = |v| v + 1;
|
|
g(1u64);
|
|
let h = |v| 1u128 + v;
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
72..73 'f': F
|
|
78..154 '{ ...+ v; }': ()
|
|
84..85 'f': F
|
|
84..88 'f(1)': {unknown}
|
|
86..87 '1': i32
|
|
98..99 'g': |u64| -> i32
|
|
102..111 '|v| v + 1': |u64| -> i32
|
|
103..104 'v': u64
|
|
106..107 'v': u64
|
|
106..111 'v + 1': i32
|
|
110..111 '1': i32
|
|
117..118 'g': |u64| -> i32
|
|
117..124 'g(1u64)': i32
|
|
119..123 '1u64': u64
|
|
134..135 'h': |u128| -> u128
|
|
138..151 '|v| 1u128 + v': |u128| -> u128
|
|
139..140 'v': u128
|
|
142..147 '1u128': u128
|
|
142..151 '1u128 + v': u128
|
|
150..151 'v': u128
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn closure_as_argument_inference_order() {
|
|
check_infer(
|
|
r#"
|
|
#[lang = "fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
}
|
|
|
|
fn foo1<T, U, F: FnOnce(T) -> U>(x: T, f: F) -> U {}
|
|
fn foo2<T, U, F: FnOnce(T) -> U>(f: F, x: T) -> U {}
|
|
|
|
struct S;
|
|
impl S {
|
|
fn method(self) -> u64;
|
|
|
|
fn foo1<T, U, F: FnOnce(T) -> U>(self, x: T, f: F) -> U {}
|
|
fn foo2<T, U, F: FnOnce(T) -> U>(self, f: F, x: T) -> U {}
|
|
}
|
|
|
|
fn test() {
|
|
let x1 = foo1(S, |s| s.method());
|
|
let x2 = foo2(|s| s.method(), S);
|
|
let x3 = S.foo1(S, |s| s.method());
|
|
let x4 = S.foo2(|s| s.method(), S);
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
94..95 'x': T
|
|
100..101 'f': F
|
|
111..113 '{}': ()
|
|
147..148 'f': F
|
|
153..154 'x': T
|
|
164..166 '{}': ()
|
|
201..205 'self': S
|
|
253..257 'self': S
|
|
259..260 'x': T
|
|
265..266 'f': F
|
|
276..278 '{}': ()
|
|
316..320 'self': S
|
|
322..323 'f': F
|
|
328..329 'x': T
|
|
339..341 '{}': ()
|
|
355..514 '{ ... S); }': ()
|
|
365..367 'x1': u64
|
|
370..374 'foo1': fn foo1<S, u64, |S| -> u64>(S, |S| -> u64) -> u64
|
|
370..393 'foo1(S...hod())': u64
|
|
375..376 'S': S
|
|
378..392 '|s| s.method()': |S| -> u64
|
|
379..380 's': S
|
|
382..383 's': S
|
|
382..392 's.method()': u64
|
|
403..405 'x2': u64
|
|
408..412 'foo2': fn foo2<S, u64, |S| -> u64>(|S| -> u64, S) -> u64
|
|
408..431 'foo2(|...(), S)': u64
|
|
413..427 '|s| s.method()': |S| -> u64
|
|
414..415 's': S
|
|
417..418 's': S
|
|
417..427 's.method()': u64
|
|
429..430 'S': S
|
|
441..443 'x3': u64
|
|
446..447 'S': S
|
|
446..471 'S.foo1...hod())': u64
|
|
453..454 'S': S
|
|
456..470 '|s| s.method()': |S| -> u64
|
|
457..458 's': S
|
|
460..461 's': S
|
|
460..470 's.method()': u64
|
|
481..483 'x4': u64
|
|
486..487 'S': S
|
|
486..511 'S.foo2...(), S)': u64
|
|
493..507 '|s| s.method()': |S| -> u64
|
|
494..495 's': S
|
|
497..498 's': S
|
|
497..507 's.method()': u64
|
|
509..510 'S': S
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn fn_item_fn_trait() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
}
|
|
|
|
struct S;
|
|
|
|
fn foo() -> S {}
|
|
|
|
fn takes_closure<U, F: FnOnce() -> U>(f: F) -> U { f() }
|
|
|
|
fn test() {
|
|
takes_closure(foo);
|
|
} //^^^^^^^^^^^^^^^^^^ S
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_in_trait_env_1() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs
|
|
trait Trait {
|
|
type Item;
|
|
}
|
|
|
|
trait Trait2 {
|
|
fn foo(&self) -> u32;
|
|
}
|
|
|
|
fn test<T: Trait>() where T::Item: Trait2 {
|
|
let x: T::Item = no_matter;
|
|
x.foo();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_in_trait_env_2() {
|
|
check_types(
|
|
r#"
|
|
trait Trait<T> {
|
|
type Item;
|
|
}
|
|
|
|
trait Trait2 {
|
|
fn foo(&self) -> u32;
|
|
}
|
|
|
|
fn test<T, U>() where T::Item: Trait2, T: Trait<U::Item>, U: Trait<()> {
|
|
let x: T::Item = no_matter;
|
|
x.foo();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_on_impl_self() {
|
|
check_infer(
|
|
r#"
|
|
//- /main.rs
|
|
trait Trait {
|
|
type Item;
|
|
|
|
fn f(&self, x: Self::Item);
|
|
}
|
|
|
|
struct S;
|
|
|
|
impl Trait for S {
|
|
type Item = u32;
|
|
fn f(&self, x: Self::Item) { let y = x; }
|
|
}
|
|
|
|
struct S2;
|
|
|
|
impl Trait for S2 {
|
|
type Item = i32;
|
|
fn f(&self, x: <Self>::Item) { let y = x; }
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
40..44 'self': &Self
|
|
46..47 'x': Trait::Item<Self>
|
|
126..130 'self': &S
|
|
132..133 'x': u32
|
|
147..161 '{ let y = x; }': ()
|
|
153..154 'y': u32
|
|
157..158 'x': u32
|
|
228..232 'self': &S2
|
|
234..235 'x': i32
|
|
251..265 '{ let y = x; }': ()
|
|
257..258 'y': i32
|
|
261..262 'x': i32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_on_trait_self() {
|
|
check_types(
|
|
r#"
|
|
trait Trait {
|
|
type Item;
|
|
|
|
fn f(&self) -> Self::Item { loop {} }
|
|
}
|
|
|
|
struct S;
|
|
impl Trait for S {
|
|
type Item = u32;
|
|
}
|
|
|
|
fn test() {
|
|
S.f();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_chalk_fold() {
|
|
check_types(
|
|
r#"
|
|
trait Interner {}
|
|
trait Fold<I: Interner, TI = I> {
|
|
type Result;
|
|
}
|
|
|
|
struct Ty<I: Interner> {}
|
|
impl<I: Interner, TI: Interner> Fold<I, TI> for Ty<I> {
|
|
type Result = Ty<TI>;
|
|
}
|
|
|
|
fn fold<I: Interner, T>(interner: &I, t: T) -> T::Result
|
|
where
|
|
T: Fold<I, I>,
|
|
{
|
|
loop {}
|
|
}
|
|
|
|
fn foo<I: Interner>(interner: &I, t: Ty<I>) {
|
|
fold(interner, t);
|
|
} //^ Ty<I>
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn trait_impl_self_ty() {
|
|
check_types(
|
|
r#"
|
|
trait Trait<T> {
|
|
fn foo(&self);
|
|
}
|
|
|
|
struct S;
|
|
|
|
impl Trait<Self> for S {}
|
|
|
|
fn test() {
|
|
S.foo();
|
|
} //^ ()
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn trait_impl_self_ty_cycle() {
|
|
check_types(
|
|
r#"
|
|
trait Trait {
|
|
fn foo(&self);
|
|
}
|
|
|
|
struct S<T>;
|
|
|
|
impl Trait for S<Self> {}
|
|
|
|
fn test() {
|
|
S.foo();
|
|
} //^ {unknown}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_in_trait_env_cycle_1() {
|
|
// this is a legitimate cycle
|
|
check_types(
|
|
r#"
|
|
trait Trait {
|
|
type Item;
|
|
}
|
|
|
|
trait Trait2<T> {}
|
|
|
|
fn test<T: Trait>() where T: Trait2<T::Item> {
|
|
let x: T::Item = no_matter;
|
|
} //^ {unknown}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unselected_projection_in_trait_env_cycle_2() {
|
|
// this is a legitimate cycle
|
|
check_types(
|
|
r#"
|
|
//- /main.rs
|
|
trait Trait<T> {
|
|
type Item;
|
|
}
|
|
|
|
fn test<T, U>() where T: Trait<U::Item>, U: Trait<T::Item> {
|
|
let x: T::Item = no_matter;
|
|
} //^ {unknown}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn inline_assoc_type_bounds_1() {
|
|
check_types(
|
|
r#"
|
|
trait Iterator {
|
|
type Item;
|
|
}
|
|
trait OtherTrait<T> {
|
|
fn foo(&self) -> T;
|
|
}
|
|
|
|
// workaround for Chalk assoc type normalization problems
|
|
pub struct S<T>;
|
|
impl<T: Iterator> Iterator for S<T> {
|
|
type Item = <T as Iterator>::Item;
|
|
}
|
|
|
|
fn test<I: Iterator<Item: OtherTrait<u32>>>() {
|
|
let x: <S<I> as Iterator>::Item;
|
|
x.foo();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn inline_assoc_type_bounds_2() {
|
|
check_types(
|
|
r#"
|
|
trait Iterator {
|
|
type Item;
|
|
}
|
|
|
|
fn test<I: Iterator<Item: Iterator<Item = u32>>>() {
|
|
let x: <<I as Iterator>::Item as Iterator>::Item;
|
|
x;
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn proc_macro_server_types() {
|
|
check_infer(
|
|
r#"
|
|
macro_rules! with_api {
|
|
($S:ident, $self:ident, $m:ident) => {
|
|
$m! {
|
|
TokenStream {
|
|
fn new() -> $S::TokenStream;
|
|
},
|
|
Group {
|
|
},
|
|
}
|
|
};
|
|
}
|
|
macro_rules! associated_item {
|
|
(type TokenStream) =>
|
|
(type TokenStream: 'static;);
|
|
(type Group) =>
|
|
(type Group: 'static;);
|
|
($($item:tt)*) => ($($item)*;)
|
|
}
|
|
macro_rules! declare_server_traits {
|
|
($($name:ident {
|
|
$(fn $method:ident($($arg:ident: $arg_ty:ty),* $(,)?) $(-> $ret_ty:ty)?;)*
|
|
}),* $(,)?) => {
|
|
pub trait Types {
|
|
$(associated_item!(type $name);)*
|
|
}
|
|
|
|
$(pub trait $name: Types {
|
|
$(associated_item!(fn $method($($arg: $arg_ty),*) $(-> $ret_ty)?);)*
|
|
})*
|
|
|
|
pub trait Server: Types $(+ $name)* {}
|
|
impl<S: Types $(+ $name)*> Server for S {}
|
|
}
|
|
}
|
|
|
|
with_api!(Self, self_, declare_server_traits);
|
|
struct G {}
|
|
struct T {}
|
|
struct Rustc;
|
|
impl Types for Rustc {
|
|
type TokenStream = T;
|
|
type Group = G;
|
|
}
|
|
|
|
fn make<T>() -> T { loop {} }
|
|
impl TokenStream for Rustc {
|
|
fn new() -> Self::TokenStream {
|
|
let group: Self::Group = make();
|
|
make()
|
|
}
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
1061..1072 '{ loop {} }': T
|
|
1063..1070 'loop {}': !
|
|
1068..1070 '{}': ()
|
|
1136..1199 '{ ... }': T
|
|
1150..1155 'group': G
|
|
1171..1175 'make': fn make<G>() -> G
|
|
1171..1177 'make()': G
|
|
1187..1191 'make': fn make<T>() -> T
|
|
1187..1193 'make()': T
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn unify_impl_trait() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
trait Trait<T> {}
|
|
|
|
fn foo(x: impl Trait<u32>) { loop {} }
|
|
fn bar<T>(x: impl Trait<T>) -> T { loop {} }
|
|
|
|
struct S<T>(T);
|
|
impl<T> Trait<T> for S<T> {}
|
|
|
|
fn default<T>() -> T { loop {} }
|
|
|
|
fn test() -> impl Trait<i32> {
|
|
let s1 = S(default());
|
|
foo(s1);
|
|
let x: i32 = bar(S(default()));
|
|
S(default())
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
26..27 'x': impl Trait<u32>
|
|
46..57 '{ loop {} }': ()
|
|
48..55 'loop {}': !
|
|
53..55 '{}': ()
|
|
68..69 'x': impl Trait<T>
|
|
91..102 '{ loop {} }': T
|
|
93..100 'loop {}': !
|
|
98..100 '{}': ()
|
|
171..182 '{ loop {} }': T
|
|
173..180 'loop {}': !
|
|
178..180 '{}': ()
|
|
213..309 '{ ...t()) }': S<{unknown}>
|
|
223..225 's1': S<u32>
|
|
228..229 'S': S<u32>(u32) -> S<u32>
|
|
228..240 'S(default())': S<u32>
|
|
230..237 'default': fn default<u32>() -> u32
|
|
230..239 'default()': u32
|
|
246..249 'foo': fn foo(S<u32>)
|
|
246..253 'foo(s1)': ()
|
|
250..252 's1': S<u32>
|
|
263..264 'x': i32
|
|
272..275 'bar': fn bar<i32>(S<i32>) -> i32
|
|
272..289 'bar(S(...lt()))': i32
|
|
276..277 'S': S<i32>(i32) -> S<i32>
|
|
276..288 'S(default())': S<i32>
|
|
278..285 'default': fn default<i32>() -> i32
|
|
278..287 'default()': i32
|
|
295..296 'S': S<{unknown}>({unknown}) -> S<{unknown}>
|
|
295..307 'S(default())': S<{unknown}>
|
|
297..304 'default': fn default<{unknown}>() -> {unknown}
|
|
297..306 'default()': {unknown}
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn assoc_types_from_bounds() {
|
|
check_infer(
|
|
r#"
|
|
//- /main.rs
|
|
#[lang = "fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
}
|
|
|
|
trait T {
|
|
type O;
|
|
}
|
|
|
|
impl T for () {
|
|
type O = ();
|
|
}
|
|
|
|
fn f<X, F>(_v: F)
|
|
where
|
|
X: T,
|
|
F: FnOnce(&X::O),
|
|
{ }
|
|
|
|
fn main() {
|
|
f::<(), _>(|z| { z; });
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
133..135 '_v': F
|
|
178..181 '{ }': ()
|
|
193..224 '{ ... }); }': ()
|
|
199..209 'f::<(), _>': fn f<(), |&()| -> ()>(|&()| -> ())
|
|
199..221 'f::<()... z; })': ()
|
|
210..220 '|z| { z; }': |&()| -> ()
|
|
211..212 'z': &()
|
|
214..220 '{ z; }': ()
|
|
216..217 'z': &()
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn associated_type_bound() {
|
|
check_types(
|
|
r#"
|
|
pub trait Trait {
|
|
type Item: OtherTrait<u32>;
|
|
}
|
|
pub trait OtherTrait<T> {
|
|
fn foo(&self) -> T;
|
|
}
|
|
|
|
// this is just a workaround for chalk#234
|
|
pub struct S<T>;
|
|
impl<T: Trait> Trait for S<T> {
|
|
type Item = <T as Trait>::Item;
|
|
}
|
|
|
|
fn test<T: Trait>() {
|
|
let y: <S<T> as Trait>::Item = no_matter;
|
|
y.foo();
|
|
} //^ u32
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn dyn_trait_through_chalk() {
|
|
check_types(
|
|
r#"
|
|
struct Box<T> {}
|
|
#[lang = "deref"]
|
|
trait Deref {
|
|
type Target;
|
|
}
|
|
impl<T> Deref for Box<T> {
|
|
type Target = T;
|
|
}
|
|
trait Trait {
|
|
fn foo(&self);
|
|
}
|
|
|
|
fn test(x: Box<dyn Trait>) {
|
|
x.foo();
|
|
} //^ ()
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn string_to_owned() {
|
|
check_types(
|
|
r#"
|
|
struct String {}
|
|
pub trait ToOwned {
|
|
type Owned;
|
|
fn to_owned(&self) -> Self::Owned;
|
|
}
|
|
impl ToOwned for str {
|
|
type Owned = String;
|
|
}
|
|
fn test() {
|
|
"foo".to_owned();
|
|
} //^ String
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn iterator_chain() {
|
|
check_infer(
|
|
r#"
|
|
//- /main.rs
|
|
#[lang = "fn_once"]
|
|
trait FnOnce<Args> {
|
|
type Output;
|
|
}
|
|
#[lang = "fn_mut"]
|
|
trait FnMut<Args>: FnOnce<Args> { }
|
|
|
|
enum Option<T> { Some(T), None }
|
|
use Option::*;
|
|
|
|
pub trait Iterator {
|
|
type Item;
|
|
|
|
fn filter_map<B, F>(self, f: F) -> FilterMap<Self, F>
|
|
where
|
|
F: FnMut(Self::Item) -> Option<B>,
|
|
{ loop {} }
|
|
|
|
fn for_each<F>(self, f: F)
|
|
where
|
|
F: FnMut(Self::Item),
|
|
{ loop {} }
|
|
}
|
|
|
|
pub trait IntoIterator {
|
|
type Item;
|
|
type IntoIter: Iterator<Item = Self::Item>;
|
|
fn into_iter(self) -> Self::IntoIter;
|
|
}
|
|
|
|
pub struct FilterMap<I, F> { }
|
|
impl<B, I: Iterator, F> Iterator for FilterMap<I, F>
|
|
where
|
|
F: FnMut(I::Item) -> Option<B>,
|
|
{
|
|
type Item = B;
|
|
}
|
|
|
|
#[stable(feature = "rust1", since = "1.0.0")]
|
|
impl<I: Iterator> IntoIterator for I {
|
|
type Item = I::Item;
|
|
type IntoIter = I;
|
|
|
|
fn into_iter(self) -> I {
|
|
self
|
|
}
|
|
}
|
|
|
|
struct Vec<T> {}
|
|
impl<T> Vec<T> {
|
|
fn new() -> Self { loop {} }
|
|
}
|
|
|
|
impl<T> IntoIterator for Vec<T> {
|
|
type Item = T;
|
|
type IntoIter = IntoIter<T>;
|
|
}
|
|
|
|
pub struct IntoIter<T> { }
|
|
impl<T> Iterator for IntoIter<T> {
|
|
type Item = T;
|
|
}
|
|
|
|
fn main() {
|
|
Vec::<i32>::new().into_iter()
|
|
.filter_map(|x| if x > 0 { Some(x as u32) } else { None })
|
|
.for_each(|y| { y; });
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
226..230 'self': Self
|
|
232..233 'f': F
|
|
317..328 '{ loop {} }': FilterMap<Self, F>
|
|
319..326 'loop {}': !
|
|
324..326 '{}': ()
|
|
349..353 'self': Self
|
|
355..356 'f': F
|
|
405..416 '{ loop {} }': ()
|
|
407..414 'loop {}': !
|
|
412..414 '{}': ()
|
|
525..529 'self': Self
|
|
854..858 'self': I
|
|
865..885 '{ ... }': I
|
|
875..879 'self': I
|
|
944..955 '{ loop {} }': Vec<T>
|
|
946..953 'loop {}': !
|
|
951..953 '{}': ()
|
|
1142..1269 '{ ... }); }': ()
|
|
1148..1163 'Vec::<i32>::new': fn new<i32>() -> Vec<i32>
|
|
1148..1165 'Vec::<...:new()': Vec<i32>
|
|
1148..1177 'Vec::<...iter()': IntoIter<i32>
|
|
1148..1240 'Vec::<...one })': FilterMap<IntoIter<i32>, |i32| -> Option<u32>>
|
|
1148..1266 'Vec::<... y; })': ()
|
|
1194..1239 '|x| if...None }': |i32| -> Option<u32>
|
|
1195..1196 'x': i32
|
|
1198..1239 'if x >...None }': Option<u32>
|
|
1201..1202 'x': i32
|
|
1201..1206 'x > 0': bool
|
|
1205..1206 '0': i32
|
|
1207..1225 '{ Some...u32) }': Option<u32>
|
|
1209..1213 'Some': Some<u32>(u32) -> Option<u32>
|
|
1209..1223 'Some(x as u32)': Option<u32>
|
|
1214..1215 'x': i32
|
|
1214..1222 'x as u32': u32
|
|
1231..1239 '{ None }': Option<u32>
|
|
1233..1237 'None': Option<u32>
|
|
1255..1265 '|y| { y; }': |u32| -> ()
|
|
1256..1257 'y': u32
|
|
1259..1265 '{ y; }': ()
|
|
1261..1262 'y': u32
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn nested_assoc() {
|
|
check_types(
|
|
r#"
|
|
struct Bar;
|
|
struct Foo;
|
|
|
|
trait A {
|
|
type OutputA;
|
|
}
|
|
|
|
impl A for Bar {
|
|
type OutputA = Foo;
|
|
}
|
|
|
|
trait B {
|
|
type Output;
|
|
fn foo() -> Self::Output;
|
|
}
|
|
|
|
impl<T:A> B for T {
|
|
type Output = T::OutputA;
|
|
fn foo() -> Self::Output { loop {} }
|
|
}
|
|
|
|
fn main() {
|
|
Bar::foo();
|
|
} //^ Foo
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn trait_object_no_coercion() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
trait Foo {}
|
|
|
|
fn foo(x: &dyn Foo) {}
|
|
|
|
fn test(x: &dyn Foo) {
|
|
foo(x);
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
21..22 'x': &dyn Foo
|
|
34..36 '{}': ()
|
|
46..47 'x': &dyn Foo
|
|
59..74 '{ foo(x); }': ()
|
|
65..68 'foo': fn foo(&dyn Foo)
|
|
65..71 'foo(x)': ()
|
|
69..70 'x': &dyn Foo
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn builtin_copy() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
|
|
struct IsCopy;
|
|
impl Copy for IsCopy {}
|
|
struct NotCopy;
|
|
|
|
trait Test { fn test(&self) -> bool; }
|
|
impl<T: Copy> Test for T {}
|
|
|
|
fn test() {
|
|
IsCopy.test();
|
|
NotCopy.test();
|
|
(IsCopy, IsCopy).test();
|
|
(IsCopy, NotCopy).test();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
110..114 'self': &Self
|
|
166..267 '{ ...t(); }': ()
|
|
172..178 'IsCopy': IsCopy
|
|
172..185 'IsCopy.test()': bool
|
|
191..198 'NotCopy': NotCopy
|
|
191..205 'NotCopy.test()': {unknown}
|
|
211..227 '(IsCop...sCopy)': (IsCopy, IsCopy)
|
|
211..234 '(IsCop...test()': bool
|
|
212..218 'IsCopy': IsCopy
|
|
220..226 'IsCopy': IsCopy
|
|
240..257 '(IsCop...tCopy)': (IsCopy, NotCopy)
|
|
240..264 '(IsCop...test()': {unknown}
|
|
241..247 'IsCopy': IsCopy
|
|
249..256 'NotCopy': NotCopy
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn builtin_fn_def_copy() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
|
|
fn foo() {}
|
|
fn bar<T: Copy>(T) -> T {}
|
|
struct Struct(usize);
|
|
enum Enum { Variant(usize) }
|
|
|
|
trait Test { fn test(&self) -> bool; }
|
|
impl<T: Copy> Test for T {}
|
|
|
|
fn test() {
|
|
foo.test();
|
|
bar.test();
|
|
Struct.test();
|
|
Enum::Variant.test();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
41..43 '{}': ()
|
|
60..61 'T': {unknown}
|
|
68..70 '{}': ()
|
|
68..70: expected T, got ()
|
|
145..149 'self': &Self
|
|
201..281 '{ ...t(); }': ()
|
|
207..210 'foo': fn foo()
|
|
207..217 'foo.test()': bool
|
|
223..226 'bar': fn bar<{unknown}>({unknown}) -> {unknown}
|
|
223..233 'bar.test()': bool
|
|
239..245 'Struct': Struct(usize) -> Struct
|
|
239..252 'Struct.test()': bool
|
|
258..271 'Enum::Variant': Variant(usize) -> Enum
|
|
258..278 'Enum::...test()': bool
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn builtin_fn_ptr_copy() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
#[lang = "copy"]
|
|
trait Copy {}
|
|
|
|
trait Test { fn test(&self) -> bool; }
|
|
impl<T: Copy> Test for T {}
|
|
|
|
fn test(f1: fn(), f2: fn(usize) -> u8, f3: fn(u8, u8) -> &u8) {
|
|
f1.test();
|
|
f2.test();
|
|
f3.test();
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
54..58 'self': &Self
|
|
108..110 'f1': fn()
|
|
118..120 'f2': fn(usize) -> u8
|
|
139..141 'f3': fn(u8, u8) -> &u8
|
|
162..210 '{ ...t(); }': ()
|
|
168..170 'f1': fn()
|
|
168..177 'f1.test()': bool
|
|
183..185 'f2': fn(usize) -> u8
|
|
183..192 'f2.test()': bool
|
|
198..200 'f3': fn(u8, u8) -> &u8
|
|
198..207 'f3.test()': bool
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn builtin_sized() {
|
|
check_infer_with_mismatches(
|
|
r#"
|
|
#[lang = "sized"]
|
|
trait Sized {}
|
|
|
|
trait Test { fn test(&self) -> bool; }
|
|
impl<T: Sized> Test for T {}
|
|
|
|
fn test() {
|
|
1u8.test();
|
|
(*"foo").test(); // not Sized
|
|
(1u8, 1u8).test();
|
|
(1u8, *"foo").test(); // not Sized
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
56..60 'self': &Self
|
|
113..228 '{ ...ized }': ()
|
|
119..122 '1u8': u8
|
|
119..129 '1u8.test()': bool
|
|
135..150 '(*"foo").test()': {unknown}
|
|
136..142 '*"foo"': str
|
|
137..142 '"foo"': &str
|
|
169..179 '(1u8, 1u8)': (u8, u8)
|
|
169..186 '(1u8, ...test()': bool
|
|
170..173 '1u8': u8
|
|
175..178 '1u8': u8
|
|
192..205 '(1u8, *"foo")': (u8, str)
|
|
192..212 '(1u8, ...test()': {unknown}
|
|
193..196 '1u8': u8
|
|
198..204 '*"foo"': str
|
|
199..204 '"foo"': &str
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn integer_range_iterate() {
|
|
check_types(
|
|
r#"
|
|
//- /main.rs crate:main deps:core
|
|
fn test() {
|
|
for x in 0..100 { x; }
|
|
} //^ i32
|
|
|
|
//- /core.rs crate:core
|
|
pub mod ops {
|
|
pub struct Range<Idx> {
|
|
pub start: Idx,
|
|
pub end: Idx,
|
|
}
|
|
}
|
|
|
|
pub mod iter {
|
|
pub trait Iterator {
|
|
type Item;
|
|
}
|
|
|
|
pub trait IntoIterator {
|
|
type Item;
|
|
type IntoIter: Iterator<Item = Self::Item>;
|
|
}
|
|
|
|
impl<T> IntoIterator for T where T: Iterator {
|
|
type Item = <T as Iterator>::Item;
|
|
type IntoIter = Self;
|
|
}
|
|
}
|
|
|
|
trait Step {}
|
|
impl Step for i32 {}
|
|
impl Step for i64 {}
|
|
|
|
impl<A: Step> iter::Iterator for ops::Range<A> {
|
|
type Item = A;
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_closure_arg() {
|
|
check_infer(
|
|
r#"
|
|
//- /lib.rs
|
|
|
|
enum Option<T> {
|
|
None,
|
|
Some(T)
|
|
}
|
|
|
|
fn foo() {
|
|
let s = Option::None;
|
|
let f = |x: Option<i32>| {};
|
|
(&f)(s)
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
52..126 '{ ...)(s) }': ()
|
|
62..63 's': Option<i32>
|
|
66..78 'Option::None': Option<i32>
|
|
88..89 'f': |Option<i32>| -> ()
|
|
92..111 '|x: Op...2>| {}': |Option<i32>| -> ()
|
|
93..94 'x': Option<i32>
|
|
109..111 '{}': ()
|
|
117..124 '(&f)(s)': ()
|
|
118..120 '&f': &|Option<i32>| -> ()
|
|
119..120 'f': |Option<i32>| -> ()
|
|
122..123 's': Option<i32>
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_fn_trait_arg() {
|
|
check_infer(
|
|
r#"
|
|
//- /lib.rs deps:std
|
|
|
|
#[lang = "fn_once"]
|
|
pub trait FnOnce<Args> {
|
|
type Output;
|
|
|
|
extern "rust-call" fn call_once(&self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
#[lang = "fn"]
|
|
pub trait Fn<Args>:FnOnce<Args> {
|
|
extern "rust-call" fn call(&self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
enum Option<T> {
|
|
None,
|
|
Some(T)
|
|
}
|
|
|
|
fn foo<F, T>(f: F) -> T
|
|
where
|
|
F: Fn(Option<i32>) -> T,
|
|
{
|
|
let s = None;
|
|
f(s)
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
101..105 'self': &Self
|
|
107..111 'args': Args
|
|
220..224 'self': &Self
|
|
226..230 'args': Args
|
|
313..314 'f': F
|
|
359..389 '{ ...f(s) }': T
|
|
369..370 's': Option<i32>
|
|
373..377 'None': Option<i32>
|
|
383..384 'f': F
|
|
383..387 'f(s)': T
|
|
385..386 's': Option<i32>
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_box_fn_arg() {
|
|
check_infer(
|
|
r#"
|
|
//- /lib.rs deps:std
|
|
|
|
#[lang = "fn_once"]
|
|
pub trait FnOnce<Args> {
|
|
type Output;
|
|
|
|
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
#[lang = "deref"]
|
|
pub trait Deref {
|
|
type Target: ?Sized;
|
|
|
|
fn deref(&self) -> &Self::Target;
|
|
}
|
|
|
|
#[lang = "owned_box"]
|
|
pub struct Box<T: ?Sized> {
|
|
inner: *mut T,
|
|
}
|
|
|
|
impl<T: ?Sized> Deref for Box<T> {
|
|
type Target = T;
|
|
|
|
fn deref(&self) -> &T {
|
|
&self.inner
|
|
}
|
|
}
|
|
|
|
enum Option<T> {
|
|
None,
|
|
Some(T)
|
|
}
|
|
|
|
fn foo() {
|
|
let s = Option::None;
|
|
let f: Box<dyn FnOnce(&Option<i32>)> = box (|ps| {});
|
|
f(&s)
|
|
}
|
|
"#,
|
|
expect![[r#"
|
|
100..104 'self': Self
|
|
106..110 'args': Args
|
|
214..218 'self': &Self
|
|
384..388 'self': &Box<T>
|
|
396..423 '{ ... }': &T
|
|
406..417 '&self.inner': &*mut T
|
|
407..411 'self': &Box<T>
|
|
407..417 'self.inner': *mut T
|
|
478..575 '{ ...(&s) }': FnOnce::Output<dyn FnOnce<(&Option<i32>,)>, (&Option<i32>,)>
|
|
488..489 's': Option<i32>
|
|
492..504 'Option::None': Option<i32>
|
|
514..515 'f': Box<dyn FnOnce<(&Option<i32>,)>>
|
|
549..562 'box (|ps| {})': Box<|{unknown}| -> ()>
|
|
554..561 '|ps| {}': |{unknown}| -> ()
|
|
555..557 'ps': {unknown}
|
|
559..561 '{}': ()
|
|
568..569 'f': Box<dyn FnOnce<(&Option<i32>,)>>
|
|
568..573 'f(&s)': FnOnce::Output<dyn FnOnce<(&Option<i32>,)>, (&Option<i32>,)>
|
|
570..572 '&s': &Option<i32>
|
|
571..572 's': Option<i32>
|
|
"#]],
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_dyn_fn_output() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "fn_once"]
|
|
pub trait FnOnce<Args> {
|
|
type Output;
|
|
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
#[lang = "fn"]
|
|
pub trait Fn<Args>: FnOnce<Args> {
|
|
extern "rust-call" fn call(&self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
fn foo() {
|
|
let f: &dyn Fn() -> i32;
|
|
f();
|
|
//^^^ i32
|
|
}"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn infer_dyn_fn_once_output() {
|
|
check_types(
|
|
r#"
|
|
#[lang = "fn_once"]
|
|
pub trait FnOnce<Args> {
|
|
type Output;
|
|
extern "rust-call" fn call_once(self, args: Args) -> Self::Output;
|
|
}
|
|
|
|
fn foo() {
|
|
let f: dyn FnOnce() -> i32;
|
|
f();
|
|
//^^^ i32
|
|
}"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn variable_kinds_1() {
|
|
check_types(
|
|
r#"
|
|
trait Trait<T> { fn get(self, t: T) -> T; }
|
|
struct S;
|
|
impl Trait<u128> for S {}
|
|
impl Trait<f32> for S {}
|
|
fn test() {
|
|
S.get(1);
|
|
//^^^^^^^^ u128
|
|
S.get(1.);
|
|
//^^^^^^^^ f32
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn variable_kinds_2() {
|
|
check_types(
|
|
r#"
|
|
trait Trait { fn get(self) -> Self; }
|
|
impl Trait for u128 {}
|
|
impl Trait for f32 {}
|
|
fn test() {
|
|
1.get();
|
|
//^^^^^^^ u128
|
|
(1.).get();
|
|
//^^^^^^^^^^ f32
|
|
}
|
|
"#,
|
|
);
|
|
}
|
|
|
|
#[test]
|
|
fn underscore_import() {
|
|
check_types(
|
|
r#"
|
|
mod tr {
|
|
pub trait Tr {
|
|
fn method(&self) -> u8 { 0 }
|
|
}
|
|
}
|
|
|
|
struct Tr;
|
|
impl crate::tr::Tr for Tr {}
|
|
|
|
use crate::tr::Tr as _;
|
|
fn test() {
|
|
Tr.method();
|
|
//^^^^^^^^^^^ u8
|
|
}
|
|
"#,
|
|
);
|
|
}
|