Add shadowing example

examples/shadowing/shadowing.mc

@@ -0,0 +1,31 @@
+int main()
+{
+	int x;
+	x = 1;
+	print_int(x);
+
+	{
+		x = 2;
+		print_int(x);
+
+		int x;
+		x = 3;
+		print_int(x);
+
+		{
+			x = 4;
+			print_int(x);
+
+			int x;
+			x = 5;
+			print_int(x);
+		}
+
+		print_int(x);
+	}
+
+	print_int(x);
+	print_nl();
+
+	return 0;
+}

examples/shadowing/shadowing.stdout.txt

@@ -0,0 +1 @@
+1234542