syntax_data: {"ast_node_type":"other","tokens":[{"end":24,"kind":"keyword","start":0,"text":"*opt"}]}
source_snippet:         *opt = match v {
context_before:     pub(crate) fn parse_fmt_debug(opt: &mut FmtDebug, v: Option<&str>) -> bool {
context_after:             Some("full") => FmtDebug::Full,