0: std::sys::unix::backtrace::tracing::imp::unwind_backtrace
             at libstd/sys/unix/backtrace/tracing/gcc_s.rs:49
   1: std::sys_common::backtrace::print
             at libstd/sys_common/backtrace.rs:71
             at libstd/sys_common/backtrace.rs:59
   2: std::panicking::default_hook::{{closure}}
             at libstd/panicking.rs:205
   3: std::panicking::default_hook
             at libstd/panicking.rs:215
   4: std::panicking::rust_panic_with_hook
             at libstd/panicking.rs:457
   5: std::panicking::begin_panic_fmt
             at libstd/panicking.rs:344
   6: rust_begin_unwind
             at libstd/panicking.rs:322
   7: core::panicking::panic_fmt
             at libcore/panicking.rs:71
   8: core::result::unwrap_failed
             at /checkout/src/libcore/macros.rs:26
   9: <core::result::Result<T, E>>::unwrap
             at /checkout/src/libcore/result.rs:782
  10: syntect::parsing::syntax_definition::MatchPattern::compile_regex
             at src/parsing/syntax_definition.rs:249
  11: syntect::parsing::syntax_definition::MatchPattern::ensure_compiled_if_possible
             at src/parsing/syntax_definition.rs:261
  12: syntect::parsing::parser::ParseState::search
             at src/parsing/parser.rs:399
  13: syntect::parsing::parser::ParseState::find_best_match
             at src/parsing/parser.rs:332
  14: syntect::parsing::parser::ParseState::parse_next_token
             at src/parsing/parser.rs:242
  15: syntect::parsing::parser::ParseState::parse_line
             at src/parsing/parser.rs:213
  16: syntect::parsing::parser::tests::ops
             at src/parsing/parser.rs:1272
  17: syntect::parsing::parser::tests::can_parse_includes
             at src/parsing/parser.rs:697
  18: syntect::__test::TESTS::{{closure}}
             at src/parsing/parser.rs:690
  19: core::ops::function::FnOnce::call_once
             at /checkout/src/libcore/ops/function.rs:223
  20: <F as alloc::boxed::FnBox<A>>::call_box
             at libtest/lib.rs:1451
             at /checkout/src/libcore/ops/function.rs:223
             at /checkout/src/liballoc/boxed.rs:638
  21: __rust_maybe_catch_panic
             at libpanic_unwind/lib.rs:105