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Add compile fail test for issue 27675
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/// The compiler previously did not properly check the bound of `From` when it was used from type | ||
/// of the dyn trait object (use in `copy_any` below). Since the associated type is under user | ||
/// control in this usage, the compiler could be tricked to believe any type implemented any trait. | ||
/// This would ICE, except for pure marker traits like `Copy`. It did not require providing an | ||
/// instance of the dyn trait type, only name said type. | ||
trait Setup { | ||
type From: Copy; | ||
} | ||
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fn copy<U: Setup + ?Sized>(from: &U::From) -> U::From { | ||
*from | ||
} | ||
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pub fn copy_any<T>(t: &T) -> T { | ||
copy::<dyn Setup<From=T>>(t) | ||
//~^ ERROR the trait bound `T: Copy` is not satisfied | ||
} | ||
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fn main() {} |