syntax_data: {"ast_node_type":"other","tokens":[{"end":18,"kind":"keyword","start":0,"text":"};"}]}
source_snippet:                 };
context_before:                     span_bug!(pat.span, "unexpected type for tuple pattern: {:?}", ty);
context_after:                 let subpatterns = self.lower_tuple_subpats(pats, tys.len(), ddpos);