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feature-gate.rs
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feature-gate.rs
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// 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 (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
if (((let 0 = 1))) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
if true && let 0 = 1 {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
if let 0 = 1 && true {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
if (let 0 = 1) && true {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
if true && (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
if (let 0 = 1) && (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
if let Range { start: _, end: _ } = (true..true) && false {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
}
fn _while() {
while let 0 = 1 {} // Stable!
while (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
while (((let 0 = 1))) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
while true && let 0 = 1 {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
while let 0 = 1 && true {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
while (let 0 = 1) && true {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
while true && (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
while (let 0 = 1) && (let 0 = 1) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
while let Range { start: _, end: _ } = (true..true) && false {}
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
}
fn _macros() {
macro_rules! noop_expr { ($e:expr) => {}; }
noop_expr!((let 0 = 1));
//~^ ERROR `let` expressions in this position are experimental [E0658]
macro_rules! use_expr {
($e:expr) => {
if $e {}
while $e {}
}
}
use_expr!((let 0 = 1 && 0 == 0));
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
use_expr!((let 0 = 1));
//~^ ERROR `let` expressions in this position are experimental [E0658]
//~| ERROR `let` expressions are not supported here
//~| ERROR `let` expressions are not supported here
#[cfg(FALSE)] (let 0 = 1);
//~^ ERROR `let` expressions in this position are experimental [E0658]
use_expr!(let 0 = 1);
//~^ ERROR no rules expected the token `let`
// ^--- FIXME(53667): Consider whether `Let` can be added to `ident_can_begin_expr`.
}
fn main() {}