481 lines
17 KiB
Rust
481 lines
17 KiB
Rust
// Here we test that `lowering` behaves correctly wrt. `let $pats = $expr` expressions.
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//
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// We want to make sure that `let` is banned in situations other than:
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//
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// expr =
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// | ...
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// | "if" expr_with_let block {"else" block}?
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// | {label ":"}? while" expr_with_let block
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// ;
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//
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// expr_with_let =
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// | "let" top_pats "=" expr
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// | expr_with_let "&&" expr_with_let
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// | "(" expr_with_let ")"
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// | expr
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// ;
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//
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// To that end, we check some positions which is not part of the language above.
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#![feature(let_chains)] // Avoid inflating `.stderr` with overzealous gates in this test.
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#![allow(irrefutable_let_patterns)]
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use std::ops::Range;
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fn main() {}
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fn _if() {
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if (let 0 = 1) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if (((let 0 = 1))) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if (let 0 = 1) && true {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if true && (let 0 = 1) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if (let 0 = 1) && (let 0 = 1) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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}
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fn _while() {
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while (let 0 = 1) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while (((let 0 = 1))) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while (let 0 = 1) && true {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while true && (let 0 = 1) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while (let 0 = 1) && (let 0 = 1) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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}
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fn _macros() {
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macro_rules! use_expr {
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($e:expr) => {
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if $e {}
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while $e {}
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}
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}
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use_expr!((let 0 = 1 && 0 == 0));
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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use_expr!((let 0 = 1));
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}
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fn nested_within_if_expr() {
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if &let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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if !let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if *let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR type `bool` cannot be dereferenced
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//~| ERROR expected expression, found `let` statement
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if -let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR cannot apply unary operator `-` to type `bool`
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//~| ERROR expected expression, found `let` statement
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fn _check_try_binds_tighter() -> Result<(), ()> {
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if let 0 = 0? {}
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//~^ ERROR the `?` operator can only be applied to values that implement `Try`
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Ok(())
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}
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if (let 0 = 0)? {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR the `?` operator can only be applied to values that implement `Try`
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//~| ERROR the `?` operator can only be used in a function that returns `Result`
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//~| ERROR expected expression, found `let` statement
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if true || let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if (true || let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if true && (true || let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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if true || (true && let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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let mut x = true;
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if x = let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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if true..(let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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if ..(let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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if (let 0 = 0).. {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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// Binds as `(let ... = true)..true &&/|| false`.
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if let Range { start: _, end: _ } = true..true && false {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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if let Range { start: _, end: _ } = true..true || false {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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// Binds as `(let Range { start: F, end } = F)..(|| true)`.
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const F: fn() -> bool = || true;
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if let Range { start: F, end } = F..|| true {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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// Binds as `(let Range { start: true, end } = t)..(&&false)`.
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let t = &&true;
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if let Range { start: true, end } = t..&&false {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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if let true = let true = true {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}
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fn nested_within_while_expr() {
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while &let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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while !let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while *let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR type `bool` cannot be dereferenced
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//~| ERROR expected expression, found `let` statement
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while -let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR cannot apply unary operator `-` to type `bool`
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//~| ERROR expected expression, found `let` statement
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fn _check_try_binds_tighter() -> Result<(), ()> {
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while let 0 = 0? {}
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//~^ ERROR the `?` operator can only be applied to values that implement `Try`
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Ok(())
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}
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while (let 0 = 0)? {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR the `?` operator can only be applied to values that implement `Try`
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//~| ERROR the `?` operator can only be used in a function that returns `Result`
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//~| ERROR expected expression, found `let` statement
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while true || let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while (true || let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while true && (true || let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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while true || (true && let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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let mut x = true;
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while x = let 0 = 0 {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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while true..(let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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while ..(let 0 = 0) {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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while (let 0 = 0).. {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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// Binds as `(let ... = true)..true &&/|| false`.
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while let Range { start: _, end: _ } = true..true && false {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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while let Range { start: _, end: _ } = true..true || false {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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// Binds as `(let Range { start: F, end } = F)..(|| true)`.
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const F: fn() -> bool = || true;
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while let Range { start: F, end } = F..|| true {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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// Binds as `(let Range { start: true, end } = t)..(&&false)`.
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let t = &&true;
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while let Range { start: true, end } = t..&&false {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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//~| ERROR mismatched types
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while let true = let true = true {}
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}
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fn not_error_because_clarified_intent() {
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if let Range { start: _, end: _ } = (true..true || false) { }
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if let Range { start: _, end: _ } = (true..true && false) { }
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while let Range { start: _, end: _ } = (true..true || false) { }
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while let Range { start: _, end: _ } = (true..true && false) { }
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}
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fn outside_if_and_while_expr() {
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&let 0 = 0;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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!let 0 = 0;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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*let 0 = 0;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR type `bool` cannot be dereferenced
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//~| ERROR expected expression, found `let` statement
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-let 0 = 0;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR cannot apply unary operator `-` to type `bool`
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//~| ERROR expected expression, found `let` statement
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fn _check_try_binds_tighter() -> Result<(), ()> {
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let 0 = 0?;
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//~^ ERROR the `?` operator can only be applied to values that implement `Try`
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Ok(())
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}
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(let 0 = 0)?;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR the `?` operator can only be used in a function that returns `Result`
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//~| ERROR the `?` operator can only be applied to values that implement `Try`
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//~| ERROR expected expression, found `let` statement
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true || let 0 = 0;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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(true || let 0 = 0);
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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true && (true || let 0 = 0);
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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let mut x = true;
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x = let 0 = 0;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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true..(let 0 = 0);
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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..(let 0 = 0);
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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(let 0 = 0)..;
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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(let Range { start: _, end: _ } = true..true || false);
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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(let true = let true = true);
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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{
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#[cfg(FALSE)]
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let x = true && let y = 1;
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//~^ ERROR expected expression, found `let` statement
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}
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#[cfg(FALSE)]
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{
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[1, 2, 3][let _ = ()]
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//~^ ERROR expected expression, found `let` statement
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}
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// Check function tail position.
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&let 0 = 0
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR mismatched types
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//~| ERROR expected expression, found `let` statement
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}
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// Let's make sure that `let` inside const generic arguments are considered.
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fn inside_const_generic_arguments() {
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struct A<const B: bool>;
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impl<const B: bool> A<{B}> { const O: u32 = 5; }
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if let A::<{
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true && let 1 = 1
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}>::O = 5 {}
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while let A::<{
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true && let 1 = 1
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}>::O = 5 {}
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if A::<{
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true && let 1 = 1
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}>::O == 5 {}
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// In the cases above we have `ExprKind::Block` to help us out.
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// Below however, we would not have a block and so an implementation might go
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// from visiting expressions to types without banning `let` expressions down the tree.
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// This tests ensures that we are not caught by surprise should the parser
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// admit non-IDENT expressions in const generic arguments.
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if A::<
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true && let 1 = 1
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expressions must be enclosed in braces
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//~| ERROR expected expression, found `let` statement
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>::O == 5 {}
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}
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fn with_parenthesis() {
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let opt = Some(Some(1i32));
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if (let Some(a) = opt && true) {
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}
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if (let Some(a) = opt) && true {
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}
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if (let Some(a) = opt) && (let Some(b) = a) {
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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}
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if let Some(a) = opt && (true && true) {
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}
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if (let Some(a) = opt && (let Some(b) = a)) && b == 1 {
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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}
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if (let Some(a) = opt && (let Some(b) = a)) && true {
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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//~| ERROR expected expression, found `let` statement
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}
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if (let Some(a) = opt && (true)) && true {
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//~^ ERROR `let` expressions are not supported here
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//~| ERROR expected expression, found `let` statement
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}
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if (true && (true)) && let Some(a) = opt {
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}
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if (true) && let Some(a) = opt {
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}
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if true && let Some(a) = opt {
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}
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let fun = || true;
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if let true = (true && fun()) && (true) {
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}
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#[cfg(FALSE)]
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let x = (true && let y = 1);
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//~^ ERROR expected expression, found `let` statement
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#[cfg(FALSE)]
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{
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([1, 2, 3][let _ = ()])
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//~^ ERROR expected expression, found `let` statement
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}
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}
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