88 lines
2.6 KiB
Rust
88 lines
2.6 KiB
Rust
// run-rustfix
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#![deny(rust_2021_incompatible_closure_captures)]
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//~^ NOTE: the lint level is defined here
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use std::thread;
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#[derive(Debug)]
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struct Foo(i32);
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impl Drop for Foo {
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fn drop(&mut self) {
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println!("{:?} dropped", self.0);
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}
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}
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/* Test Send Trait Migration */
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struct SendPointer(*mut i32);
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unsafe impl Send for SendPointer {}
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fn test_send_trait() {
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let mut f = 10;
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let fptr = SendPointer(&mut f as *mut i32);
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thread::spawn(move || unsafe {
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//~^ ERROR: changes to closure capture
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//~| NOTE: in Rust 2018, this closure implements `Send`
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//~| NOTE: for more information, see
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//~| HELP: add a dummy let to cause `fptr` to be fully captured
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*fptr.0 = 20;
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//~^ NOTE: in Rust 2018, this closure captures all of `fptr`, but in Rust 2021, it will only capture `fptr.0`
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}).join().unwrap();
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}
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/* Test Sync Trait Migration */
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struct CustomInt(*mut i32);
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struct SyncPointer(CustomInt);
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unsafe impl Sync for SyncPointer {}
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unsafe impl Send for CustomInt {}
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fn test_sync_trait() {
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let mut f = 10;
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let f = CustomInt(&mut f as *mut i32);
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let fptr = SyncPointer(f);
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thread::spawn(move || unsafe {
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//~^ ERROR: changes to closure capture
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//~| NOTE: in Rust 2018, this closure implements `Sync`
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//~| NOTE: in Rust 2018, this closure implements `Send`
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//~| NOTE: for more information, see
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//~| HELP: add a dummy let to cause `fptr` to be fully captured
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*fptr.0.0 = 20;
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//~^ NOTE: in Rust 2018, this closure captures all of `fptr`, but in Rust 2021, it will only capture `fptr.0.0`
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}).join().unwrap();
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}
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/* Test Clone Trait Migration */
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struct S(#[allow(dead_code)] Foo);
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struct T(i32);
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struct U(#[allow(dead_code)] S, T);
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impl Clone for U {
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fn clone(&self) -> Self {
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U(S(Foo(0)), T(0))
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}
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}
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fn test_clone_trait() {
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let f = U(S(Foo(0)), T(0));
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let c = || {
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//~^ ERROR: changes to closure capture in Rust 2021 will affect drop order and which traits the closure implements
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//~| NOTE: in Rust 2018, this closure implements `Clone`
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//~| NOTE: for more information, see
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//~| HELP: add a dummy let to cause `f` to be fully captured
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let f_1 = f.1;
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//~^ NOTE: in Rust 2018, this closure captures all of `f`, but in Rust 2021, it will only capture `f.1`
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println!("{:?}", f_1.0);
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};
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let c_clone = c.clone();
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c_clone();
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}
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//~^ NOTE: in Rust 2018, `f` is dropped here, but in Rust 2021, only `f.1` will be dropped here as part of the closure
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fn main() {
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test_send_trait();
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test_sync_trait();
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test_clone_trait();
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}
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