syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"span_debug:"}]}
source_snippet:     span_debug: bool = (false, parse_bool, [UNTRACKED],
context_before:         "Set the threshold for objects to be stored in a \"small data\" section"),
context_after:         "forward proc_macro::Span's `Debug` impl to `Span`"),