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let_chains: Add feature gate tests.
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‎src/test/ui/rfc-2497-if-let-chains/feature-gate.rs

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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 (let 0 = 1) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions only supported in `if`
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if (((let 0 = 1))) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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if true && let 0 = 1 {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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if let 0 = 1 && true {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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if (let 0 = 1) && true {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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if true && (let 0 = 1) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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if (let 0 = 1) && (let 0 = 1) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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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 in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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if let Range { start: _, end: _ } = (true..true) && false {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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}
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fn _while() {
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if let 0 = 1 {} // Stable!
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while (let 0 = 1) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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while (((let 0 = 1))) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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while true && let 0 = 1 {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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while let 0 = 1 && true {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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while (let 0 = 1) && true {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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while true && (let 0 = 1) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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while (let 0 = 1) && (let 0 = 1) {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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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 in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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//~| ERROR `let` expressions in this position are experimental [E0658]
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while let Range { start: _, end: _ } = (true..true) && false {}
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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}
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fn _macros() {
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macro_rules! noop_expr { ($e:expr) => {}; }
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noop_expr!((let 0 = 1));
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macro_rules! use_expr {
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($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 in this position are experimental [E0658]
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use_expr!((let 0 = 1));
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//~^ ERROR `let` expressions in this position are experimental [E0658]
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use_expr!(let 0 = 1);
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}
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fn main() {}

‎src/test/ui/rfc-2497-if-let-chains/feature-gate.stderr

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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:14:9
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|
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LL | if (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:18:11
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|
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LL | if (((let 0 = 1))) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:21:16
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|
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LL | if true && let 0 = 1 {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:24:8
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|
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LL | if let 0 = 1 && true {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:27:9
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|
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LL | if (let 0 = 1) && true {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:30:17
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|
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LL | if true && (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:33:9
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|
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LL | if (let 0 = 1) && (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:33:24
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|
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LL | if (let 0 = 1) && (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:37:8
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|
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LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:37:21
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|
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LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:37:35
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|
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LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:37:48
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|
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LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:37:61
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|
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LL | if let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:44:8
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|
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LL | if let Range { start: _, end: _ } = (true..true) && false {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:51:12
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|
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LL | while (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:54:14
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|
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LL | while (((let 0 = 1))) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:57:19
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|
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LL | while true && let 0 = 1 {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:60:11
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|
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LL | while let 0 = 1 && true {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:63:12
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|
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LL | while (let 0 = 1) && true {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:66:20
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|
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LL | while true && (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:69:12
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|
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LL | while (let 0 = 1) && (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:69:27
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|
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LL | while (let 0 = 1) && (let 0 = 1) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:73:11
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|
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LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:73:24
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|
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LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:73:38
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|
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LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:73:51
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|
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LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:73:64
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|
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LL | while let 0 = 1 && let 1 = 2 && (let 2 = 3 && let 3 = 4 && let 4 = 5) {}
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:80:11
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|
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LL | while let Range { start: _, end: _ } = (true..true) && false {}
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| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:94:15
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|
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LL | use_expr!(let 0 = 1 && 0 == 0);
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error[E0658]: `let` expressions in this position are experimental
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--> $DIR/feature-gate.rs:96:16
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|
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LL | use_expr!((let 0 = 1));
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| ^^^^^^^^^
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|
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= note: for more information, see https://github.com/rust-lang/rust/issues/53667
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= help: add #![feature(let_chains)] to the crate attributes to enable
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error: `let` expressions only supported in `if`
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--> $DIR/feature-gate.rs:14:9
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|
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LL | if (let 0 = 1) {}
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| ^^^^^^^^^
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error: aborting due to 31 previous errors
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For more information about this error, try `rustc --explain E0658`.

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