diff options
Diffstat (limited to 'src/test/ui/rfc-2497-if-let-chains/feature-gate.rs')
-rw-r--r-- | src/test/ui/rfc-2497-if-let-chains/feature-gate.rs | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/test/ui/rfc-2497-if-let-chains/feature-gate.rs b/src/test/ui/rfc-2497-if-let-chains/feature-gate.rs new file mode 100644 index 000000000..2b407ef51 --- /dev/null +++ b/src/test/ui/rfc-2497-if-let-chains/feature-gate.rs @@ -0,0 +1,62 @@ +// gate-test-let_chains + +// Here we test feature gating for ´let_chains`. +// See `disallowed-positions.rs` for the grammar +// defining the language for gated allowed positions. + +#![allow(irrefutable_let_patterns)] + +use std::ops::Range; + +fn _if() { + if let 0 = 1 {} // Stable! + + if true && let 0 = 1 {} + //~^ ERROR `let` expressions in this position are unstable [E0658] + + if let 0 = 1 && true {} + //~^ ERROR `let` expressions in this position are unstable [E0658] + + if let Range { start: _, end: _ } = (true..true) && false {} + //~^ ERROR `let` expressions in this position are unstable [E0658] + + if let 1 = 1 && let true = { true } && false { + //~^ ERROR `let` expressions in this position are unstable [E0658] + //~| ERROR `let` expressions in this position are unstable [E0658] + } +} + +fn _while() { + while let 0 = 1 {} // Stable! + + while true && let 0 = 1 {} + //~^ ERROR `let` expressions in this position are unstable [E0658] + + while let 0 = 1 && true {} + //~^ ERROR `let` expressions in this position are unstable [E0658] + + while let Range { start: _, end: _ } = (true..true) && false {} + //~^ ERROR `let` expressions in this position are unstable [E0658] +} + +fn _macros() { + macro_rules! noop_expr { ($e:expr) => {}; } + + noop_expr!((let 0 = 1)); + //~^ ERROR `let` expressions in this position are unstable [E0658] + //~| ERROR expected expression, found `let` statement + + macro_rules! use_expr { + ($e:expr) => { + if $e {} + while $e {} + } + } + #[cfg(FALSE)] (let 0 = 1); + //~^ ERROR `let` expressions in this position are unstable [E0658] + //~| ERROR expected expression, found `let` statement + use_expr!(let 0 = 1); + //~^ ERROR no rules expected the token `let` +} + +fn main() {} |