only reuse nameless blocks in blockify in asm2wasm - if they are named, they can be broken out of, which is bad for our loop constructs

1 files changed, 2 insertions, 1 deletions

diff --git a/src/asm2wasm.h b/src/asm2wasm.h
index c994d0ef2..4c37b7705 100644
--- a/src/asm2wasm.h
+++ b/src/asm2wasm.h
@@ -419,8 +419,9 @@ private:
     return nullptr;
   }
 
+  // ensure a nameless block
   Block* blockify(Expression* expression) {
-    if (expression->is<Block>()) return expression->dyn_cast<Block>();
+    if (expression->is<Block>() && !expression->cast<Block>()->name.is()) return expression->dyn_cast<Block>();
     auto ret = allocator.alloc<Block>();
     ret->list.push_back(expression);
     ret->finalize();