ICE: cannot export private function via public static variable

[gifnksm]

Following code causing ICE.
foo.rs

pub static fun: extern fn() = foo;

fn foo() {
  println("Foo");
}

main.rs

extern mod foo;

fn main() {
  (foo::fun)();
}

$  rustc --lib foo.rs
warning: missing crate link meta `name`, using `foo` as default
warning: missing crate link meta `vers`, using `0.0` as default
$ rustc main.rs -L .
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug
note: try running with RUST_LOG=rustc=1,::rt::backtrace to get further details and report the results to github.com/mozilla/rust/issues

If foo::foo is declared as pub, the code compiles successfully.

[gifnksm]

This may be related to #4202.

[thomaslee]

It feels relatively unlikely to me that this relates directly to #4202, but I'll try to take a look at this later in the week -- unless of course you're keen to fix it yourself @gifnksm :)

[bblum]

The error message of the ICE is "'lookup_item: id not found: 11', /home/rustbuild/src/rust-buildbot/slave/snap3-linux/build/src/librustc/metadata/decoder.rs:86".

But, this appears to work fine with my stage1 compiler, despite reproducing on stage0. Reopen if this comes back, I guess?