ICE in macro expansion

[dwrensha]

The following program causes the rustc error: "error: internal compiler error: unexpected failure note: the compiler hit an unexpected failure path. this is a bug"

macro_rules! silly_macro(
    () => (
        pub mod Qux {
            pub struct Foo { x : u8 }
            pub fn bar(_foo : Foo) {}
        }
    );
)

silly_macro!()

fn main() {}

Perhaps related to recent commits by @jbclements?

[jbclements]

sigh... affirmative. Checking further.

[jbclements]

yep. I see the problem. Working on a fix.

[jbclements]

yep, got a fix. I'm going to try to sneak a few more fixes in here, while I'm at it.

[jbclements]

fixed by #9135.