rust/tests/ui/macros/issue-8851.rs

// run-pass
#![allow(dead_code)]
// after fixing #9384 and implementing hygiene for match bindings,
// this now fails because the insertion of the 'y' into the match
// doesn't cause capture. Making this macro hygienic (as I've done)
// could very well make this test case completely pointless....

// pretty-expanded FIXME #23616

enum T {
    A(isize),
    B(usize)
}

macro_rules! test {
    ($id:ident, $e:expr) => (
        fn foo(t: T) -> isize {
            match t {
                T::A($id) => $e,
                T::B($id) => $e
            }
        }
    )
}

test!(y, 10 + (y as isize));

pub fn main() {
    foo(T::A(20));
}