syntax_data: {"ast_node_type":"other","tokens":[{"end":87,"kind":"keyword","start":0,"text":"span_bug!(pat.span,"}]}
source_snippet:                     span_bug!(pat.span, "unexpected type for tuple pattern: {:?}", ty);
context_before:                 let ty::Tuple(tys) = ty.kind() else {
context_after:                 };