Merge pull request #3257 from WalterBright/fix12044

fix Issue 12044 - Invalid code gen causes segfault

src/mtype.c

@@ -2428,6 +2428,8 @@ Identifier *Type::getTypeInfoIdent(int internal)
         if (ty == Tarray)
             buf.writeByte(mangleChar[((TypeArray *)this)->next->ty]);
     }
+    else if (deco)
+        buf.writestring(deco);
     else
         toDecoBuffer(&buf);
 
@@ -2441,7 +2443,7 @@ Identifier *Type::getTypeInfoIdent(int internal)
     assert(name);
 
     sprintf(name, "_D%lluTypeInfo_%s6__initZ", (unsigned long long) 9 + len, buf.data);
-    //printf("name = %s\n", name);
+    //printf("%p, deco = %s, name = %s\n", this, deco, name);
     assert(strlen(name) < namelen);     // don't overflow the buffer
 
     size_t off = 0;

test/runnable/xtest46.d

@@ -6881,6 +6881,32 @@ void test11317()
 
 /***************************************************/
 
+struct S12044(T)
+{
+    void f()()
+    {
+        new T[1];
+    }
+
+    bool opEquals(O)(O)
+    {
+        f();
+    }
+}
+
+void test12044()
+{
+    ()
+    {
+        enum E { e }
+        auto arr = [E.e];
+        S12044!E s;
+    }
+    ();
+}
+
+/***************************************************/
+
 int main()
 {
     test1();
@@ -7164,6 +7190,7 @@ int main()
     test7254();
     test11075();
     test11317();
+    test12044();
 
     printf("Success\n");
     return 0;