Old style retagging should emit a compiler warning when newdecls are required.

sourcepawn/compiler/tests/warn-oldstyle-cast.sp

@@ -0,0 +1,18 @@
+
+#pragma newdecls required
+
+enum MyType:{};
+
+native void Print(MyType value);
+native void PrintF(float value);
+
+public void main()
+{
+	int val = 2;
+	MyType otherVal = MyType:val;
+
+	float value2 = Float:val;
+
+	Print(otherVal);
+	PrintF(value2);
+}

sourcepawn/compiler/tests/warn-oldstyle-cast.txt

@@ -0,0 +1,2 @@
+(12) : warning 240: 'MyType:' is an old-style tag operation; use view_as<MyType>(expression) instead
+(14) : warning 240: 'Float:' is an old-style tag operation; use view_as<float>(expression) instead