diff --git a/js/src/jsapi.cpp b/js/src/jsapi.cpp
--- a/js/src/jsapi.cpp
+++ b/js/src/jsapi.cpp
@@ -231,10 +231,21 @@
     int x = 0;
     int y = 0;
     if (x < y); // after: bugprone-suspicious-semicolon; readability-braces-around-statements
     {
       x++;
+      struct B {
+        B() {} // after: modernize-use-equals-default
+        B(const B&) {} // after: modernize-use-equals-default
+         B(B &&) {} // after: performance-noexcept-move-constructor
+      };
+
+      struct D : B {
+        D() : B() {}
+        D(const D &RHS) : B(RHS) {} // after: modernize-use-equals-default
+        D(D &&RHS) : B(RHS) {} // after: performance-move-constructor-init; performance-noexcept-move-constructor
+      };
     }
 
     MOZ_ASSERT(code_ != Uninitialized);
     MOZ_ASSERT(!ok());
     MOZ_ASSERT(!ErrorTakesArguments(code_));