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-rw-r--r--src/passes/RemoveUnusedBrs.cpp4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/passes/RemoveUnusedBrs.cpp b/src/passes/RemoveUnusedBrs.cpp
index 4fda7afb2..a5950f2fa 100644
--- a/src/passes/RemoveUnusedBrs.cpp
+++ b/src/passes/RemoveUnusedBrs.cpp
@@ -719,6 +719,10 @@ struct RemoveUnusedBrs : public WalkerPass<PostWalker<RemoveUnusedBrs>> {
Type refType =
Properties::getFallthroughType(curr->ref, passOptions, *getModule());
+ if (refType == Type::unreachable) {
+ // Leave this to DCE.
+ return;
+ }
assert(refType.isRef());
// When we optimize based on all the fallthrough type information