28 lines
837 B
Rust
28 lines
837 B
Rust
// compile-flags: -Znext-solver
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trait Setup {
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type From: Copy;
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}
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fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From {
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*from
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}
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pub fn copy_any<T>(t: &T) -> T {
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copy::<dyn Setup<From=T>>(t)
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//~^ ERROR the type `&<dyn Setup<From = T> as Setup>::From` is not well-formed
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//~| ERROR the trait bound `dyn Setup<From = T>: Setup` is not satisfied
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//~| ERROR mismatched types
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//~| ERROR the type `<dyn Setup<From = T> as Setup>::From` is not well-formed
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//~| ERROR the size for values of type `<dyn Setup<From = T> as Setup>::From` cannot be known at compilation time
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// FIXME(-Znext-solver): These error messages are horrible and some of them
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// are even simple fallout from previous error.
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}
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fn main() {
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let x = String::from("Hello, world");
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let y = copy_any(&x);
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println!("{y}");
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}
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