syntax_data: {"ast_node_type":"other","tokens":[{"end":9,"kind":"keyword","start":0,"text":"where"}]}
source_snippet:     where
context_before:     fn record_arg_with_span<A>(&mut self, source_map: &SourceMap, event_arg: A, span: crate::Span)
context_after:         A: Borrow<str> + Into<String>;