failures:
    webgl-context/clearcolor.html == webgl-context/clearcolor_ref.html
    webgl-context/draw_arrays_simple.html == webgl-context/draw_arrays_simple_ref.html
    webgl-context/tex_image_2d_canvas.html == webgl-context/tex_image_2d_canvas_ref.html
    webgl-context/tex_image_2d_canvas2d.html == webgl-context/tex_image_2d_canvas_ref.html
    webgl-context/tex_image_2d_canvas_no_context.html == webgl-context/tex_image_2d_canvas_no_context_ref.html
    webgl-context/tex_image_2d_simple.html == webgl-context/tex_image_2d_simple_ref.html

---- webgl-context/tex_image_2d_simple.html == webgl-context/tex_image_2d_simple_ref.html stdout ----
    thread 'webgl-context/tex_image_2d_simple.html == webgl-context/tex_image_2d_simple_ref.html' panicked at 'assertion failed: exit_status.success()', ../../tests/reftest.rs:335
stack backtrace:
   1:     0x7ffb1f767270 - sys::backtrace::tracing::imp::write::h23bfa7a49ed99d87Klt
   2:     0x7ffb1f769f55 - panicking::log_panic::_<closure>::closure.39180
   3:     0x7ffb1f7699c5 - panicking::log_panic::h846e3da4ec5bd0b1Wlx
   4:     0x7ffb1f74d693 - sys_common::unwind::begin_unwind_inner::h04ad996baf6f81c7bds
   5:     0x7ffb1f6beab7 - sys_common::unwind::begin_unwind::begin_unwind::h6074138493330590073
                        at src/libstd/sys/common/unwind/mod.rs:214
   6:     0x7ffb1f6dad8b - capture::hff9977986cfb9b32YNa
                        at /home/servo/buildbot/slave/linux-dev/build/components/servo/<std macros>:3
   7:     0x7ffb1f6d8bb8 - check_reftest::hf0aac9bc09fd257ekXa
                        at ../../tests/reftest.rs:351
   8:     0x7ffb1f6d8ac7 - make_test::_<closure>::closure.15753
                        at ../../tests/reftest.rs:278
   9:     0x7ffb1f6d9a17 - boxed::_<impl>::call_box::call_box::h5794098128060069563
                        at src/liballoc/boxed.rs:516
  10:     0x7ffb1f739eb8 - boxed::_<impl>::call_box::call_box::h17282746878263628964
  11:     0x7ffb1f738224 - sys_common::unwind::try::try_fn::try_fn::h14061410362995320864
  12:     0x7ffb1f7667a8 - __rust_try
  13:     0x7ffb1f75ddcb - sys_common::unwind::try::inner_try::h25c781202f1ad3a1J9r
  14:     0x7ffb1f7383be - boxed::_<impl>::call_box::call_box::h7646584381128873602
  15:     0x7ffb1f768a43 - sys::thread::_<impl>::new::thread_start::h89508aa1f401717d8Dw
  16:     0x7ffb1e579181 - start_thread
  17:     0x7ffb1ed9347c - __clone
  18:                0x0 - <unknown>