syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"track_diagnostics:"}]}
source_snippet:     track_diagnostics: bool = (false, parse_bool, [UNTRACKED],
context_before:         "for every macro invocation, print its name and arguments (default: no)"),
context_after:         "tracks where in rustc a diagnostic was emitted"),