error: expected expression, found `let` statement
  --> $DIR/feature-gate.rs:54:20
   |
LL |     #[cfg(FALSE)] (let 0 = 1);
   |                    ^^^
   |
   = note: only supported directly in conditions of `if` and `while` expressions

error: expected expression, found `let` statement
  --> $DIR/feature-gate.rs:45:17
   |
LL |     noop_expr!((let 0 = 1));
   |                 ^^^
   |
   = note: only supported directly in conditions of `if` and `while` expressions

error: no rules expected the token `let`
  --> $DIR/feature-gate.rs:56:15
   |
LL |     macro_rules! use_expr {
   |     --------------------- when calling this macro
...
LL |     use_expr!(let 0 = 1);
   |               ^^^ no rules expected this token in macro call
   |
note: while trying to match meta-variable `$e:expr`
  --> $DIR/feature-gate.rs:49:10
   |
LL |         ($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: aborting due to 11 previous errors

For more information about this error, try `rustc --explain E0658`.