| error[E0277]: expected a `Fn()` closure, found `extern "C" fn() {f}` |
| --> $DIR/extern-wrong-value-type.rs:9:11 |
| | |
| LL | is_fn(f); |
| | ----- ^ expected an `Fn()` closure, found `extern "C" fn() {f}` |
| | | |
| | required by a bound introduced by this call |
| | |
| = help: the trait `Fn<()>` is not implemented for fn item `extern "C" fn() {f}` |
| = note: wrap the `extern "C" fn() {f}` in a closure with no arguments: `|| { /* code */ }` |
| note: required by a bound in `is_fn` |
| --> $DIR/extern-wrong-value-type.rs:4:28 |
| | |
| LL | fn is_fn<F>(_: F) where F: Fn() {} |
| | ^^^^ required by this bound in `is_fn` |
| |
| error: aborting due to previous error |
| |
| For more information about this error, try `rustc --explain E0277`. |