syntax_data: {"ast_node_type":"other","tokens":[{"end":70,"kind":"keyword","start":0,"text":"fmt_debug:"}]}
source_snippet:     fmt_debug: FmtDebug = (FmtDebug::Full, parse_fmt_debug, [TRACKED],
context_before:         (default: yes)"),
context_after:         "how detailed `#[derive(Debug)]` should be. `full` prints types recursively, \