tqchen commented on a change in pull request #7084:
URL: https://github.com/apache/tvm/pull/7084#discussion_r544715878



##########
File path: src/tir/transforms/make_packed_api.cc
##########
@@ -41,6 +41,56 @@
 namespace tvm {
 namespace tir {
 
+class ReturnRewriter : public StmtMutator {
+ public:
+  explicit ReturnRewriter(Var ret_var, Var ret_tcode) : ret_var_(ret_var), 
ret_tcode_(ret_tcode) {}
+
+  Stmt VisitStmt_(const EvaluateNode* node) override {
+    Stmt ret = StmtMutator::VisitStmt_(node);
+    const EvaluateNode* eval = ret.as<EvaluateNode>();
+    CHECK(eval);

Review comment:
       I would agree for cases where the invariant was less clear. In this 
particular case the impl of StmtMutator was quite direct and invariant is 
clear, so adding error message won't buy us too much in this particular case. 
Additionally, having to have a long error message for all cases would increase 
the binary size.
   
   I think we should certainly deliberate error messages that we do hit. One 
way to do so is to re-actively add them when we hit the problem. This case is 
certainly fine




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