gcc/testsuite/rust/compile/parse_complex_generic_application2.rs

#![feature(lang_items)]
#[lang = "sized"]
pub trait Sized {}

pub enum Either<L, R> {
    Left(L),
    Right(R),
}

pub struct Wrap<T>(T);

pub fn foo_wrap() -> Either<(), Wrap<u8>> {
    Either::Left(())
}