syntax_data: {"ast_node_type":"other","tokens":[{"end":57,"kind":"keyword","start":0,"text":"trace_macros:"}]}
source_snippet:     trace_macros: bool = (false, parse_bool, [UNTRACKED],
context_before:         "choose the TLS model to use (`rustc --print tls-models` for details)"),
context_after:         "for every macro invocation, print its name and arguments (default: no)"),