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diff --git a/tests/ui/rfc-2497-if-let-chains/feature-gate.stderr b/tests/ui/rfc-2497-if-let-chains/feature-gate.stderr
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+++ b/tests/ui/rfc-2497-if-let-chains/feature-gate.stderr
@@ -0,0 +1,120 @@
+error: expected expression, found `let` statement
+ --> $DIR/feature-gate.rs:55:20
+ |
+LL | #[cfg(FALSE)] (let 0 = 1);
+ | ^^^
+
+error: expected expression, found `let` statement
+ --> $DIR/feature-gate.rs:45:17
+ |
+LL | noop_expr!((let 0 = 1));
+ | ^^^
+
+error: no rules expected the token `let`
+ --> $DIR/feature-gate.rs:58:15
+ |
+LL | macro_rules! use_expr {
+ | --------------------- when calling this macro
+...
+LL | use_expr!(let 0 = 1);
+ | ^^^ no rules expected this token in macro call
+ |
+note: while trying to match meta-variable `$e:expr`
+ --> $DIR/feature-gate.rs:50:10
+ |
+LL | ($e:expr) => {
+ | ^^^^^^^
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:14:16
+ |
+LL | if true && let 0 = 1 {}
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:17:8
+ |
+LL | if let 0 = 1 && true {}
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:20:8
+ |
+LL | if let Range { start: _, end: _ } = (true..true) && false {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:23:8
+ |
+LL | if let 1 = 1 && let true = { true } && false {
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:23:21
+ |
+LL | if let 1 = 1 && let true = { true } && false {
+ | ^^^^^^^^^^^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:32:19
+ |
+LL | while true && let 0 = 1 {}
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:35:11
+ |
+LL | while let 0 = 1 && true {}
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:38:11
+ |
+LL | while let Range { start: _, end: _ } = (true..true) && false {}
+ | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:55:20
+ |
+LL | #[cfg(FALSE)] (let 0 = 1);
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error[E0658]: `let` expressions in this position are unstable
+ --> $DIR/feature-gate.rs:45:17
+ |
+LL | noop_expr!((let 0 = 1));
+ | ^^^^^^^^^
+ |
+ = note: see issue #53667 <https://github.com/rust-lang/rust/issues/53667> for more information
+ = help: add `#![feature(let_chains)]` to the crate attributes to enable
+
+error: aborting due to 13 previous errors
+
+For more information about this error, try `rustc --explain E0658`.