Deprecated '&' macro arguments.

resources/examples/swap.c3

@@ -1,14 +1,14 @@
 module test;
-import libc;
+import std::io;
 
 <*
- @require values::@assign_to(*b, *a) && values::@assign_to(*a, *b)
+ @require $defined(#a = #b, #b = #a)
 *>
-macro void @swap(&a, &b)
+macro void @swap(#a, #b)
 {
-    var temp = *a;
-    *a = *b;
-    *b = temp;
+    var temp = #a;
+    #a = #b;
+    #b = temp;
 }
 
 fn void main()
@@ -16,5 +16,5 @@ fn void main()
 	int x = 123;
 	int y = 456;
 	@swap(x, y);
-	libc::printf("x: %d y: %d\n", x, y);
+	io::printfn("x: %d y: %d", x, y);
 }