warning: unnecessary braces around function argument
  --> $DIR/unused_braces_borrow.rs:22:13
   |
LL |     consume({ a.b });
   |             ^^^^^^^ help: remove these braces
   |
note: the lint level is defined here
  --> $DIR/unused_braces_borrow.rs:2:9
   |
LL | #![warn(unused_braces)]
   |         ^^^^^^^^^^^^^