syntax_data: {"ast_node_type":"other","tokens":[{"end":56,"kind":"keyword","start":0,"text":"time_passes:"}]}
source_snippet:     time_passes: bool = (false, parse_bool, [UNTRACKED],
context_before:         "measure time of each LLVM pass (default: no)"),
context_after:         "measure time of each rustc pass (default: no)"),