syntax_data: {"ast_node_type":"other","tokens":[{"end":62,"kind":"keyword","start":0,"text":"span_free_formats:"}]}
source_snippet:     span_free_formats: bool = (false, parse_bool, [UNTRACKED],
context_before:     /// o/w tests have closure@path
context_after:         "exclude spans when debug-printing compiler state (default: no)"),