compiler panic - Referenced variable location is not an alloca!

[jonasp]

This little program causes a compiler panic:

fn main() {
  return;
  let a = "";
}

The error message is the following:

error: internal compiler error: debuginfo::create_local_var_metadata() - Referenced variable location is not an alloca!

thread 'rustc' panicked at 'Box<Any>', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libsyntax/diagnostic.rs:123

stack backtrace:
   1:        0x1110d3460 - sys::backtrace::write::hd64c72d07de40cf8tbt
   2:        0x1110f3817 - failure::on_fail::h646e1201dbb0ef3bNhz
   3:        0x11106570a - rt::unwind::begin_unwind_inner::hec294e47b94ba78aiZy
   4:        0x10ef6fc57 - rt::unwind::begin_unwind::h558350071601703502
   5:        0x10ef6fbe4 - diagnostic::SpanHandler::span_bug::he3912bc404042fc4LQF
   6:        0x10e40930d - session::Session::span_bug::h5801ed3acd26a48eY4l
   7:        0x10dbbfa8e - middle::pat_util::pat_bindings::closure.48598
   8:        0x10ef3a3f1 - ast_util::walk_pat::hbe1ce29526693031GsC
   9:        0x10daafca0 - trans::controlflow::trans_block::h956d3c669c21aa441Vd
  10:        0x10db6c487 - trans::base::trans_closure::h98002b90cdeb7941jSt
  11:        0x10daa4326 - trans::base::trans_fn::h68450a8b056829a432t
  12:        0x10da9faec - trans::base::trans_item::h8a58a6cf2c6184c8Vnu
  13:        0x10db72f18 - trans::base::trans_crate::h35254e15f256e4f14iv
  14:        0x10d870560 - driver::phase_4_translate_to_llvm::h2943144b3698b013mDa
  15:        0x10d8478b3 - driver::compile_input::hd01e9035001db87cwba
  16:        0x10d9e5d54 - thunk::F.Invoke<A,$u{20}R$GT$::invoke::h356901253070274503
  17:        0x10d9e2670 - rt::unwind::try::try_fn::h13338831715023405046
  18:        0x11115b029 - rust_try_inner
  19:        0x11115b016 - rust_try
  20:        0x10d9e2d6b - thunk::F.Invoke<A,$u{20}R$GT$::invoke::h15972762549593096795
  21:        0x1110e2de4 - sys::thread::thread_start::h719786e0e5fa53d4b1v
  22:     0x7fff8e9742fc - _pthread_body
  23:     0x7fff8e974279 - _pthread_body

[huonw]

cc @michaelwoerister

[michaelwoerister]

Good catch, @jonasp! I'll fix this shortly.