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https://github.com/rust-lang/rust
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23 lines
475 B
Rust
23 lines
475 B
Rust
//@ edition:2018
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#![feature(ptr_metadata)]
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#![feature(type_alias_impl_trait)]
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type Opaque = impl std::fmt::Debug + ?Sized;
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fn opaque() -> &'static Opaque {
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&[1] as &[i32]
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}
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fn a<T: ?Sized>() {
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is_thin::<T>();
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//~^ ERROR type mismatch resolving `<T as Pointee>::Metadata == ()`
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is_thin::<Opaque>();
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//~^ ERROR type mismatch resolving `<Opaque as Pointee>::Metadata == ()`
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}
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fn is_thin<T: std::ptr::Pointee<Metadata = ()> + ?Sized>() {}
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fn main() {}
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