mirror of https://github.com/rust-lang/rust
25 lines
631 B
Rust
25 lines
631 B
Rust
//@ run-pass
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// Makes sure we don't propagate generic instances of `Self: ?Sized` blanket impls.
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// This is relevant when we have an overlapping impl and builtin dyn instance.
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// See <https://github.com/rust-lang/rust/pull/114941> for more context.
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trait Trait {
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fn foo(&self) -> &'static str;
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}
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impl<T: ?Sized> Trait for T {
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fn foo(&self) -> &'static str {
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std::any::type_name::<T>()
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}
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}
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fn bar<T: ?Sized>() -> fn(&T) -> &'static str {
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const { Trait::foo as fn(&T) -> &'static str }
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// If const prop were to propagate the instance
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}
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fn main() {
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assert_eq!("i32", bar::<dyn Trait>()(&1i32));
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}
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