diff options
Diffstat (limited to 'tests/ui/on-unimplemented/on-trait.rs')
-rw-r--r-- | tests/ui/on-unimplemented/on-trait.rs | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/tests/ui/on-unimplemented/on-trait.rs b/tests/ui/on-unimplemented/on-trait.rs new file mode 100644 index 000000000..556813cd4 --- /dev/null +++ b/tests/ui/on-unimplemented/on-trait.rs @@ -0,0 +1,32 @@ +// ignore-tidy-linelength + +#![feature(rustc_attrs)] + +pub mod Bar { + #[rustc_on_unimplemented = "test error `{Self}` with `{Bar}` `{Baz}` `{Quux}` in `{Foo}`"] + pub trait Foo<Bar, Baz, Quux> {} +} + +use Bar::Foo; + +fn foobar<U: Clone, T: Foo<u8, U, u32>>() -> T { + panic!() +} + +#[rustc_on_unimplemented="a collection of type `{Self}` cannot be built from an iterator over elements of type `{A}`"] +trait MyFromIterator<A> { + /// Builds a container with elements from an external iterator. + fn my_from_iter<T: Iterator<Item=A>>(iterator: T) -> Self; +} + +fn collect<A, I: Iterator<Item=A>, B: MyFromIterator<A>>(it: I) -> B { + MyFromIterator::my_from_iter(it) +} + +pub fn main() { + let x = vec![1u8, 2, 3, 4]; + let y: Option<Vec<u8>> = collect(x.iter()); // this should give approximately the same error for x.iter().collect() + //~^ ERROR + + let x: String = foobar(); //~ ERROR +} |