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