added test case for last commit (taking delegate of nested function of current function)

tests/mini/delegate2.d

@@ -0,0 +1,12 @@
+module mini.delegate2;
+
+void main()
+{
+    int foo = 42;
+    int bar()
+    {
+        return foo;
+    }
+    int delegate() dg = &bar;
+    assert(dg() == foo);
+}