warning: the feature `const_generics` is incomplete and may cause the compiler to crash
  --> $DIR/unused_braces.rs:4:12
   |
LL | #![feature(const_generics)]
   |            ^^^^^^^^^^^^^^
   |
   = note: `#[warn(incomplete_features)]` on by default

warning: unnecessary braces around const expression
  --> $DIR/unused_braces.rs:11:14
   |
LL |     let _: A<{ 7 }>;
   |              ^^^^^ help: remove these braces
   |
note: the lint level is defined here
  --> $DIR/unused_braces.rs:2:9
   |
LL | #![warn(unused_braces)]
   |         ^^^^^^^^^^^^^

warning: 2 warnings emitted