syntax_data: {"ast_node_type":"other","tokens":[{"end":77,"kind":"keyword","start":0,"text":"self.in_union_destructure"}]}
source_snippet:                         self.in_union_destructure = old_in_union_destructure;
context_before:                         visit::walk_pat(self, pat);
context_after:                     } else if (Bound::Unbounded, Bound::Unbounded)