[Strings] Add string.new GC variants (#4813)

1 files changed, 4 insertions, 1 deletions

diff --git a/src/ir/effects.h b/src/ir/effects.h
index 58480f0ff..43d4868d8 100644
--- a/src/ir/effects.h
+++ b/src/ir/effects.h
@@ -732,7 +732,10 @@ private:
       // we keep the code here simpler, but it does mean another optimization
       // cycle may be needed in some cases.
     }
-    void visitStringNew(StringNew* curr) {}
+    void visitStringNew(StringNew* curr) {
+      // traps when out of bounds in linear memory or ref is null
+      parent.implicitTrap = true;
+    }
     void visitStringConst(StringConst* curr) {}
     void visitStringMeasure(StringMeasure* curr) {
       // traps when ref is null.