syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"\"print"}]}
source_snippet:         "print some statistics about macro expansions (default: no)"),
context_before:     macro_stats: bool = (false, parse_bool, [UNTRACKED],
context_after:     maximal_hir_to_mir_coverage: bool = (false, parse_bool, [TRACKED],