warning: unnecessary `unsafe` block
  --> $DIR/expr-unsafe.rs:12:13
   |
LL |             unsafe {}
   |             ^^^^^^ unnecessary `unsafe` block
   |
note: the lint level is defined here
  --> $DIR/expr-unsafe.rs:4:9
   |
LL | #![warn(unused_unsafe)]
   |         ^^^^^^^^^^^^^

warning: 1 warning emitted