warning: unused variable: `item`
  --> $DIR/unboxed-closures-counter-not-moved.rs:15:13
   |
LL |         for item in y {
   |             ^^^^ help: if this is intentional, prefix it with an underscore: `_item`
   |
   = note: `#[warn(unused_variables)]` on by default

warning: value assigned to `counter` is never read
  --> $DIR/unboxed-closures-counter-not-moved.rs:24:9
   |
LL |         counter += 1;
   |         ^^^^^^^
   |
   = help: maybe it is overwritten before being read?
   = note: `#[warn(unused_assignments)]` on by default

warning: unused variable: `counter`
  --> $DIR/unboxed-closures-counter-not-moved.rs:24:9
   |
LL |         counter += 1;
   |         ^^^^^^^
   |
   = help: did you mean to capture by reference instead?

warning: 3 warnings emitted