{"ast_node_type":"variable","tokens":[{"end":61,"kind":"keyword","start":0,"text":"let"}]}
                let callee_ty = func.ty(self.body, self.tcx);
            | mir::TerminatorKind::TailCall { ref func, ref args, ref fn_span } => {
                let callee_ty = self.monomorphize(callee_ty);