syntax_data: {"ast_node_type":"other","tokens":[{"end":54,"kind":"keyword","start":0,"text":"match"}]}
source_snippet:         match Span::prepare_to_combine(self, within) {
context_before:     pub fn within_macro(self, within: Span, sm: &SourceMap) -> Option<Span> {
context_after:             // Only return something if it doesn't overlap with the original span,