rustc is ICEing when it tries to build itself

[canndrew]

This is a fresh, master rustc. Running ./configure && make gives me

error: internal compiler error: unexpected panic
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
task 'rustc' panicked at 'assertion failed: end <= self.len()', /home/shum/src/rust/rust/src/libcore/slice.rs:432

stack backtrace:
   1:     0x7f5556dbe2a0 - rt::backtrace::imp::write::hcfffe16bac1a89d8tOx
   2:     0x7f5556dc03c0 - failure::on_fail::h596b868d4d6c672fTfy
   3:     0x7f5556a29250 - unwind::begin_unwind_inner::h58e38c39c8ade205CJc
   4:     0x7f5556a28e60 - unwind::begin_unwind_fmt::hf2df3f18d8eb7398ZGc
   5:     0x7f5556a28e20 - rust_begin_unwind
   6:     0x7f5556a6ff50 - panicking::panic_fmt::h70018dd8b3bfa8e7Stl
   7:     0x7f5556a6dc50 - panicking::panic::h3466351790214922irl
   8:     0x7f55554de570 - metadata::loader::Context<'a>::extract_one::h801ddd4ec3be2f4dsqx
   9:     0x7f55554d8350 - metadata::loader::Context<'a>::find_library_crate::hee79ca7c8f32d193Ogx
  10:     0x7f55554d0720 - metadata::creader::resolve_crate::h3e6012eb682240d8b0v
  11:     0x7f55554cb560 - metadata::creader::Env<'a>.visit..Visitor<'v>::visit_view_item::hf4601eef2f3fd81d6sv
  12:     0x7f55554caa80 - metadata::creader::read_crates::h981338246f370e1a0rv
  13:     0x7f5557220f10 - util::common::time::h15532658999104091233
  14:     0x7f55571e03f0 - driver::phase_3_run_analysis_passes::hc4c4d1f218f64fd2Cta
  15:     0x7f55571d0da0 - driver::compile_input::h8b1acb183a176df5pba
  16:     0x7f555726eba0 - run::closure.21547
  17:     0x7f555727cb50 - task::TaskBuilder::try_future::closure.23001
  18:     0x7f5556d9e3c0 - task::TaskBuilder::spawn_internal::closure.30601
  19:     0x7f5556a276f0 - task::Task::spawn::closure.5726
  20:     0x7f5556a82d70 - rust_try_inner
  21:     0x7f5556a82d60 - rust_try
  22:     0x7f5556a275f0 - task::Task::run::h858807944c2b839efKb
  23:     0x7f5556a27240 - task::Task::spawn::closure.5702
  24:     0x7f5556a286d0 - thread::thread_start::h1e8a9989f227f958w1b
  25:     0x7f5551cdb100 - <unknown>
  26:     0x7f55566febb9 - clone
  27:                0x0 - <unknown>

[canndrew]

Nevermind. git clean -df; make clean fixed it somehow.