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error[E0277]: expected a `Fn<()>` closure, found `extern "C" fn() {f}`
--> $DIR/extern-wrong-value-type.rs:9:11
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LL | is_fn(f);
| ----- ^ expected an `Fn<()>` closure, found `extern "C" fn() {f}`
| |
| required by a bound introduced by this call
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= 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
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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`.
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