Latest nightly compiler panics when compiling gcc-rs

[mystor]

If you download the latest compiler, and attempt to compile gcc-rs (cargo build), you'll get an error like the following:

% cargo build
   Compiling gcc v0.1.2 (file://path/to/gcc-rs)
/path/to/gcc-rs/src/lib.rs:77:9: 77:18 error: internal compiler error: create_for_loop_var_metadata() - Referenced variable location is not an alloca!
/path/to/gcc-rs/src/lib.rs:77     for directory in config.include_directories.iter() {
                                      ^~~~~~~~~
note: the compiler unexpectedly panicked. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
thread 'rustc' panicked at 'Box<Any>', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libsyntax/diagnostic.rs:123


Could not compile `gcc`.

To learn more, run the command again with --verbose.

As the compiler output states, this is a bug with rustc, but it also could be manifest due to a bug in gcc-rs. So I thought I'd report it here.

(rust version: rustc 0.13.0-nightly (34d680009 2014-12-22 00:12:47 +0000))
(cargo version: cargo 0.0.1-pre-nightly (e11c317 2014-12-21 20:43:45 +0000))

[alexcrichton]

Dupe of rust-lang/rust#20127, but thanks!