63 lines
1.8 KiB
Rust
63 lines
1.8 KiB
Rust
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// gate-test-let_chains
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// Here we test feature gating for ´let_chains`.
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// See `disallowed-positions.rs` for the grammar
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// defining the language for gated allowed positions.
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#![allow(irrefutable_let_patterns)]
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use std::ops::Range;
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fn _if() {
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if let 0 = 1 {} // Stable!
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if true && let 0 = 1 {}
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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if let 0 = 1 && true {}
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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if let Range { start: _, end: _ } = (true..true) && false {}
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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if let 1 = 1 && let true = { true } && false {
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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//~| ERROR `let` expressions in this position are unstable [E0658]
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}
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}
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fn _while() {
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while let 0 = 1 {} // Stable!
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while true && let 0 = 1 {}
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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while let 0 = 1 && true {}
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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while let Range { start: _, end: _ } = (true..true) && false {}
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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}
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fn _macros() {
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macro_rules! noop_expr { ($e:expr) => {}; }
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noop_expr!((let 0 = 1));
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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//~| ERROR expected expression, found `let` statement
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macro_rules! use_expr {
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($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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#[cfg(FALSE)] (let 0 = 1);
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//~^ ERROR `let` expressions in this position are unstable [E0658]
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//~| ERROR expected expression, found `let` statement
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use_expr!(let 0 = 1);
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//~^ ERROR no rules expected the token `let`
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}
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fn main() {}
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