error: function `a` is never used
  --> $DIR/in-closure.rs:7:12
   |
LL |         fn a() {}
   |            ^
   |
note: the lint level is defined here
  --> $DIR/in-closure.rs:3:9
   |
LL | #![deny(dead_code)]
   |         ^^^^^^^^^

error: constant `A` is never used
  --> $DIR/in-closure.rs:13:11
   |
LL |     const A: usize = 1;
   |           ^

error: aborting due to 2 previous errors