"internal compiler error: tried to pop without a push" when trying to use an undefined macro inside an impl block

[dzamlo]

An internal compiler error happen when using an undefined macro inside an impl block.

Here is a minimal example to reproduce the error:

#![feature(macro_rules)]

impl Foo {
    test!()
}

fn main() {}

Here is the error reported by rustc:

> RUST_BACKTRACE=1 rustc test.rs
test.rs:4:5: 4:9 error: macro undefined: 'test!'
test.rs:4     test!()
              ^~~~
error: internal compiler error: tried to pop without a push
note: the compiler hit an unexpected failure path. 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
task 'rustc' failed at 'Box<Any>', /home/rustbuild/src/rust-buildbot/slave/nightly-linux/build/src/libsyntax/diagnostic.rs:175

stack backtrace:
   1:     0x7fab5dad61d0 - rt::backtrace::imp::write::ha0361403f416ccd9Ocq
   2:     0x7fab5dad9360 - failure::on_fail::h4e64388bd642f413byq
   3:     0x7fab5e273ba0 - unwind::begin_unwind_inner::hd273521a0e8ebce8Axd
   4:     0x7fab5c54de70 - unwind::begin_unwind::h6546896763742138129
   5:     0x7fab5c54e620 - diagnostic::Handler::bug::h8760f4cb58cfcfbesTF
   6:     0x7fab5c6478a0 - ext::base::ExtCtxt<'a>::bug::h20fd4470a67ec647hV5
   7:     0x7fab5c60d480 - ext::base::ExtCtxt<'a>::bt_pop::h45e111edeef12f14xR5
   8:     0x7fab5c6beb70 - ext::expand::MacroExpander<'a, 'b>.Folder::fold_method::h60bdff4b615f56d6H9c
   9:     0x7fab5c6b6a70 - fold::noop_fold_item_underscore::h5153028995318274890
  10:     0x7fab5c6b3ac0 - ext::expand::MacroExpander<'a, 'b>.Folder::fold_item_underscore::h64ae51273c5cddbbn8c
  11:     0x7fab5c6b35d0 - fold::noop_fold_item::closure.54351
  12:     0x7fab5c534090 - ptr::P<T>::map::h5845961873979508555
  13:     0x7fab5c6adc70 - ext::expand::expand_item::hb8b38f73e65b975eync
  14:     0x7fab5c6bcb20 - fold::noop_fold_mod::closure.54380
  15:     0x7fab5c5e5800 - iter::Iterator::collect::h5376275078778274821
  16:     0x7fab5c6bb8b0 - fold::Folder::fold_mod::h701201873445886102
  17:     0x7fab5c70a310 - ext::expand::expand_crate::h00d22b8f01ebc040tbd
  18:     0x7fab5ef3e400 - driver::driver::phase_2_configure_and_expand::closure.143392
  19:     0x7fab5ecaf6e0 - driver::driver::phase_2_configure_and_expand::h642b31d00bd1082bUcA
  20:     0x7fab5eefe0c0 - driver::driver::compile_input::h3ae2ce706c1a2c7805z
  21:     0x7fab5ef87360 - driver::run_compiler::h60b334313035cdc4bTD
  22:     0x7fab5ef87210 - driver::run::closure.144858
  23:     0x7fab5e682310 - task::TaskBuilder<S>::try_future::closure.103258
  24:     0x7fab5e6820f0 - task::TaskBuilder<S>::spawn_internal::closure.103229
  25:     0x7fab5f7edbd0 - task::NativeSpawner.Spawner::spawn::closure.8438
  26:     0x7fab5e2ccdf0 - rust_try_inner
  27:     0x7fab5e2ccde0 - rust_try
  28:     0x7fab5e271460 - unwind::try::hd12740a912640cc1imd
  29:     0x7fab5e2712e0 - task::Task::run::ha62f1c0aea75bedcWBc
  30:     0x7fab5f7ed910 - task::NativeSpawner.Spawner::spawn::closure.8378
  31:     0x7fab5e272bb0 - thread::thread_start::h90ae59691b46ad307Vc
  32:     0x7fab5d5a1d40 - start_thread
  33:     0x7fab5df430a9 - clone
  34:                0x0 - <unknown>

The version of rust I'm using:

> rustc -v
rustc 0.13.0-nightly (96991e933 2014-10-22 23:57:11 +0000)

On x86_64, using openSUSE 12.3.

[ghost]

Closing as a dupe of #19734.