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error[E0782]: expected a type, found a trait
--> $DIR/avoid-ice-on-warning-2.rs:4:13
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LL | fn id<F>(f: Copy) -> usize {
| ^^^^
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= note: `Copy` is dyn-incompatible, otherwise a trait object could be used
help: use a new generic type parameter, constrained by `Copy`
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LL - fn id<F>(f: Copy) -> usize {
LL + fn id<F, T: Copy>(f: T) -> usize {
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help: you can also use an opaque type, but users won't be able to specify the type parameter when calling the `fn`, having to rely exclusively on type inference
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LL | fn id<F>(f: impl Copy) -> usize {
| ++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0782`.
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