syntax_data: {"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"///"}]}
source_snippet:     /// o/w tests have closure@path
context_before:         "forward proc_macro::Span's `Debug` impl to `Span`"),
context_after:     span_free_formats: bool = (false, parse_bool, [UNTRACKED],