syntax_data: {"ast_node_type":"other","tokens":[{"end":59,"kind":"keyword","start":0,"text":"visit_subpat(self,"}]}
source_snippet:                 visit_subpat(self, subpattern, user_tys, f)
context_before:             PatKind::ExpandedConstant { ref subpattern, .. } => {
context_after:             }