warning: unnecessary braces around function argument
  --> $DIR/unused_braces_borrow.rs:24:13
   |
LL |     consume({ a.b });
   |             ^^   ^^
   |
note: the lint level is defined here
  --> $DIR/unused_braces_borrow.rs:4:9
   |
LL | #![warn(unused_braces)]
   |         ^^^^^^^^^^^^^
help: remove these braces
   |
LL -     consume({ a.b });
LL +     consume(a.b);
   |

warning: 1 warning emitted