From 7ef710285d815d6d17d72a64dfb20c1a76d90310 Mon Sep 17 00:00:00 2001
From: wrongtest <wrongtest0@gmail.com>
Date: Wed, 23 Feb 2022 00:07:55 +0800
Subject: [PATCH] check to avoid crash in opt_level=0 vm build

---
 src/relay/transforms/memory_alloc.cc | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/relay/transforms/memory_alloc.cc b/src/relay/transforms/memory_alloc.cc
index 900442e9b9a8..5b584e199dc7 100644
--- a/src/relay/transforms/memory_alloc.cc
+++ b/src/relay/transforms/memory_alloc.cc
@@ -140,6 +140,9 @@ class DialectRewriter : public transform::DeviceAwareExprMutator {
 
     VirtualDevice virtual_device = GetVirtualDevice(call);
     ICHECK(!virtual_device->IsFullyUnconstrained());
+    ICHECK(!scopes_.empty())
+        << "Calls out of a let block are not supported, do you forget to transform "
+        << "with ToANormalForm or set opt_level >= 1 in the pass context?";
     LetList& scope = scopes_.back();
 
     std::vector<Expr> new_args;