syntax_data: {"ast_node_type":"variable","tokens":[{"end":63,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                         if let ty::Adt(def, _) = *pat_ty.kind()
context_before:                     Some(pat_ty)
context_after:                             && self.tcx.is_lang_item(def.did(), LangItem::String) =>