1 error[E0658]: let bindings in constant functions are unstable (see issue #48821)
2 --> $DIR/feature-gate-const_let.rs:16:13
7 = help: add #![feature(const_let)] to the crate attributes to enable
9 error[E0658]: statements in constant functions are unstable (see issue #48821)
10 --> $DIR/feature-gate-const_let.rs:16:13
15 = help: add #![feature(const_let)] to the crate attributes to enable
17 error: aborting due to 2 previous errors
19 For more information about this error, try `rustc --explain E0658`.