diff options
Diffstat (limited to 'tests/ui/traits/next-solver/object-unsafety.rs')
-rw-r--r-- | tests/ui/traits/next-solver/object-unsafety.rs | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/traits/next-solver/object-unsafety.rs b/tests/ui/traits/next-solver/object-unsafety.rs new file mode 100644 index 000000000..cfa53948b --- /dev/null +++ b/tests/ui/traits/next-solver/object-unsafety.rs @@ -0,0 +1,27 @@ +// compile-flags: -Znext-solver + +trait Setup { + type From: Copy; +} + +fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From { + *from +} + +pub fn copy_any<T>(t: &T) -> T { + copy::<dyn Setup<From=T>>(t) + //~^ ERROR the type `&<dyn Setup<From = T> as Setup>::From` is not well-formed + //~| ERROR the trait bound `dyn Setup<From = T>: Setup` is not satisfied + //~| ERROR mismatched types + //~| ERROR the type `<dyn Setup<From = T> as Setup>::From` is not well-formed + //~| ERROR the size for values of type `<dyn Setup<From = T> as Setup>::From` cannot be known at compilation time + + // FIXME(-Znext-solver): These error messages are horrible and some of them + // are even simple fallout from previous error. +} + +fn main() { + let x = String::from("Hello, world"); + let y = copy_any(&x); + println!("{y}"); +} |