diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
--- a/js/src/jsapi.cpp
+++ b/js/src/jsapi.cpp
@@ -238,10 +238,21 @@
     int x = 0;
     int y = 0;
     if (x < y); // misc-suspicious-semicolon
     {
       x++;
+      struct B {
+        B() {}
+        B(const B&) {}
+         B(B &&) {}
+      };
+
+      struct D : B {
+        D() : B() {}
+        D(const D &RHS) : B(RHS) {}
+        D(D &&RHS) : B(RHS) {}
+      };
     }
 
     MOZ_ASSERT(code_ != Uninitialized);
     MOZ_ASSERT(!ok());
     MOZ_ASSERT(!ErrorTakesArguments(code_));