thread 'StyleThread#2' panicked at 'already mutably borrowed', Z:\build\build\src\third_party\rust\atomic_refcell\src\lib.rs:161
stack backtrace:
   0:     0x7ffc41f3074f - <unknown>
   1:     0x7ffc41f2f97c - <unknown>
   2:     0x7ffc41f2f1ee - <unknown>
   3:     0x7ffc41f2eacf - <unknown>
OS|Windows NT|10.0.14393
CPU|amd64|family 6 model 94 stepping 3|4
GPU|||
Crash|EXCEPTION_ILLEGAL_INSTRUCTION|0x7ffc41f2f276|36
36|0|xul.dll|std::panicking::rust_panic_with_hook::h4d68aac0b79bfb98|git:github.com/rust-lang/rust:src/libstd/panicking.rs:0ade339411587887bf01bcfa2e9ae4414c8900d4|555|0x41
36|1|xul.dll|std::panicking::begin_panic<&str>::h4d68aac0b79bfb98|git:github.com/rust-lang/rust:src/libstd/panicking.rs:0ade339411587887bf01bcfa2e9ae4414c8900d4|511|0x12
36|2|xul.dll|atomic_refcell::AtomicBorrowRef::do_panic::h4d68aac0b79bfb98|hg:hg.mozilla.org/mozilla-central:third_party/rust/atomic_refcell/src/lib.rs:37b95547f0d2|161|0x18
36|3|xul.dll|style::values::specified::color::{{impl}}::to_computed_value::h4d68aac0b79bfb98|hg:hg.mozilla.org/mozilla-central:servo/components/style/values/specified/color.rs:37b95547f0d2|288|0xc
0|0|ntdll.dll|AslpFilePartialViewFree|||0x36808
0|1|||||0xcd07ffd740
0|2|KERNELBASE.dll|FSPErrorMessages::CMessageHashVectorBuilder::GetEndIndexHash(unsigned short const *)|||0x38
0|3|||||0xcd07ffd740
