ICE with sibling methods containing same-name-enum containing same-name-member

[chris-morgan]

If you have two methods in an impl block, each containing an enum (with the same name), each containing at least one value with the same name, rustc gives the same LLVM symbol for the two of them and fails, as it does not include the method name in the symbol name.

Minimal test case:

pub struct Foo;
impl Foo {
    pub fn foo() {
        enum Panic { Common };
    }
    pub fn bar() {
        enum Panic { Common };
    }
}
fn main() {
}

error: internal compiler error: duplicate LLVM symbol: _ZN14__extensions__5Panic6Common7descrim17_32f9788ad4163dc87_0$x2e0E
rust: task failed at 'explicit failure', /home/chris/vc/rust/src/libsyntax/diagnostic.rs:95
rust: task failed at 'explicit failure', /home/chris/vc/rust/src/librustc/rustc.rs:355
rust: domain main @0x19ffd90 root task failed
leaked memory in rust main loop (1 objects)
rustc: /home/chris/vc/rust/src/rt/memory_region.cpp:192: memory_region::~memory_region(): Assertion `false' failed.

[alexcrichton]

This is probably either the same or very closely related to #2074. Not closing as a dupe because that bug says it only happens with @fn which this isn't using.

[alexcrichton]

This passes now (I suspect my symbol changes recently have fixed this), flagging as needstest.