MarisaKirisame commented on a change in pull request #5780:
URL: https://github.com/apache/incubator-tvm/pull/5780#discussion_r441162964
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File path: src/relay/analysis/well_formed.cc
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@@ -74,12 +74,21 @@ class WellFormedChecker : private ExprVisitor,
PatternVisitor {
}
void VisitExpr_(const LetNode* l) final {
- Scope s(this);
- // we do letrec only for FunctionNode,
- // but shadowing let in let binding is likely programming error, and we
should forbidden it.
- Bound(l->var);
- CheckWellFormed(l->value);
- CheckWellFormed(l->body);
+ std::vector<Scope*> scopes;
+ Expr let = GetRef<Let>(l);
+ while (auto let_node = let.as<LetNode>()) {
+ scopes.push_back(new Scope(this));
+ // we do letrec only for FunctionNode,
+ // but shadowing let in let binding is likely programming error, and we
should forbidden it.
+ Bound(let_node->var);
+ CheckWellFormed(let_node->value);
+ let = let_node->body;
+ }
+ CheckWellFormed(let);
+ while (!scopes.empty()) {
+ delete scopes.back();
Review comment:
can you use unique_ptr?
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