{"ast_node_type":"variable","tokens":[{"end":79,"kind":"keyword","start":0,"text":"if"}]}
        if let hir::ExprKind::MethodCall(segment, rcvr, args, span) = expr.kind
        let typeck_results = self.infcx.tcx.typeck(self.mir_def_id());
            && let Some(expr_ty) = typeck_results.node_type_opt(expr.hir_id)