Distinct inline would not implement protocol if the inlined implemented it. This closes #1292

test/test_suite/dynamic/inline_protocol.c3

@@ -0,0 +1,35 @@
+interface Foo
+{
+	fn int foo();
+}
+
+struct Abc (Foo)
+{
+	int a;
+}
+
+struct Bcd
+{
+	inline Abc a;
+}
+
+struct Def
+{
+	Abc a;
+}
+
+fn int Abc.foo(&self) @dynamic => 1;
+
+distinct Foob = inline Abc;
+
+fn void test1()
+{
+	Foob b;
+	Abc x;
+	Bcd y;
+	Def d;
+	Foo f = &x;
+	f = &b;
+	f = &y;
+	f = &d; // #error: assume the interface is implemented
+}