1error[E0525]: expected a closure that implements the `Fn` trait, but this closure only implements `FnOnce`
2  --> $DIR/unboxed-closures-infer-fn-once-move-from-projection.rs:14:13
3   |
4LL |     let c = || drop(y.0);
5   |             ^^^^^^^^---^
6   |             |       |
7   |             |       closure is `FnOnce` because it moves the variable `y` out of its environment
8   |             this closure implements `FnOnce`, not `Fn`
9LL |     foo(c);
10   |     --- the requirement to implement `Fn` derives from here
11
12error: aborting due to previous error
13
14For more information about this error, try `rustc --explain E0525`.
15