1 files changed, 11 insertions, 8 deletions
diff --git a/src/wasm/wasm-s-parser.cpp b/src/wasm/wasm-s-parser.cpp
index 9cf2f3be9..3075f70d7 100644
--- a/src/wasm/wasm-s-parser.cpp
+++ b/src/wasm/wasm-s-parser.cpp
@@ -2130,18 +2130,21 @@ Expression* SExpressionWasmBuilder::makeRefCast(Element& s) {
   return Builder(wasm).makeRefCast(ref, rtt);
 }
 
-Expression* SExpressionWasmBuilder::makeBrOnCast(Element& s) {
+Expression* SExpressionWasmBuilder::makeBrOn(Element& s, BrOnOp op) {
   auto name = getLabel(*s[1]);
   auto* ref = parseExpression(*s[2]);
-  auto* rtt = parseExpression(*s[3]);
+  Expression* rtt = nullptr;
   Builder builder(wasm);
-  if (rtt->type == Type::unreachable) {
-    // An unreachable rtt is not supported: the text format does not provide the
-    // type, so if it's unreachable we should not even create a br_on_cast in
-    // such a case, as we'd have no idea what it casts to.
-    return builder.makeSequence(builder.makeDrop(ref), rtt);
+  if (op == BrOnCast) {
+    rtt = parseExpression(*s[3]);
+    if (rtt->type == Type::unreachable) {
+      // An unreachable rtt is not supported: the text format does not provide
+      // the type, so if it's unreachable we should not even create a br_on_cast
+      // in such a case, as we'd have no idea what it casts to.
+      return builder.makeSequence(builder.makeDrop(ref), rtt);
+    }
   }
-  return builder.makeBrOnCast(name, ref, rtt);
+  return builder.makeBrOn(op, name, ref, rtt);
 }
 
 Expression* SExpressionWasmBuilder::makeRttCanon(Element& s) {