syntax_data: {"ast_node_type":"function","tokens":[{"end":38,"kind":"keyword","start":0,"text":"fn"}]}
source_snippet:     fn thir(&self) -> &'p Thir<'tcx> {
context_before: impl<'p, 'tcx> Visitor<'p, 'tcx> for MatchVisitor<'p, 'tcx> {
context_after:         self.thir