syntax_data: {"ast_node_type":"other","tokens":[{"end":37,"kind":"keyword","start":0,"text":"ty::RePlaceholder(p)"}]}
source_snippet:             ty::RePlaceholder(p) => {
context_before:         let r2 = match r1.kind() {
context_after:                 let replace_var = self.mapped_regions.get(&p);