rust/src/test/ui/unboxed-closures-infer-fn-once-move-from-projection.stderr

error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
  --> $DIR/unboxed-closures-infer-fn-once-move-from-projection.rs:24:13
   |
24 |     let c = || drop(y.0); //~ ERROR expected a closure that implements the `Fn` trait
   |             ^^^^^^^^-^^^
   |             |       |
   |             |       closure is `FnOnce` because it moves the variable `y` out of its environment
   |             this closure implements `FnOnce`, not `Fn`
25 |     foo(c);
   |     --- the requirement to implement `Fn` derives from here

error: aborting due to previous error

If you want more information on this error, try using "rustc --explain E0525"