25 lines
735 B
Rust
25 lines
735 B
Rust
|
// Regression test for an ICE that occurred with the universes code:
|
||
|
|
//
|
||
|
|
// The signature of the closure `|_|` was being inferred to
|
||
|
|
// `exists<'r> fn(&'r u8)`. This should result in a type error since
|
||
|
|
// the signature `for<'r> fn(&'r u8)` is required. However, due to a
|
||
|
|
// bug in the type variable generalization code, the placeholder for
|
||
|
|
// `'r` was leaking out into the writeback phase, causing an ICE.
|
||
|
|
|
||
|
|
trait ClonableFn<T> {
|
||
|
|
fn clone(&self) -> Box<dyn Fn(T)>;
|
||
|
|
}
|
||
|
|
|
||
|
|
impl<T, F: 'static> ClonableFn<T> for F
|
||
|
|
where F: Fn(T) + Clone {
|
||
|
|
fn clone(&self) -> Box<dyn Fn(T)> {
|
||
|
|
Box::new(self.clone())
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
struct Foo(Box<dyn for<'a> ClonableFn<&'a bool>>);
|
||
|
|
|
||
|
|
fn main() {
|
||
|
|
Foo(Box::new(|_| ())); //~ ERROR mismatched types
|
||
|
|
}
|