fix Issue 17915 - [REG 2.073] core.exception.AssertError@ddmd/optimiz…

…e.d(614): Assertion failure
dlang · Nov 2, 2017 · dd2fcfa · dd2fcfa
1 parent 3c2d007
commit dd2fcfa
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diff --git a/src/ddmd/optimize.d b/src/ddmd/optimize.d
@@ -610,6 +610,8 @@ extern (C++) Expression Expression_optimize(Expression e, int result, bool keepL
                 // See if we can remove an unnecessary cast
                 ClassDeclaration cdfrom = e.e1.type.isClassHandle();
                 ClassDeclaration cdto = e.type.isClassHandle();
+                if (cdto == ClassDeclaration.object && !cdfrom.isInterfaceDeclaration())
+                    goto L1;    // can always convert a class to Object
                 // Need to determine correct offset before optimizing away the cast.
                 // https://issues.dlang.org/show_bug.cgi?id=16980
                 cdfrom.size(e.loc);

diff --git a/test/runnable/xtest46.d b/test/runnable/xtest46.d
@@ -7942,6 +7942,22 @@ void test17349()
     assert(i == 2);
 }
 
+/***************************************************/
+// https://issues.dlang.org/show_bug.cgi?id=17915
+
+void test17915()
+{
+    static class MyClass
+    {
+        S17915!MyClass m_member;
+    }
+}
+
+struct S17915(T)
+{
+    T owner;
+}
+
 /***************************************************/
 
 int main()
@@ -8262,6 +8278,7 @@ int main()
     test16466();
     test16408();
     test17349();
+    test17915();
 
     printf("Success\n");
     return 0;