error[E0412]: cannot find type `S` in this scope
  --> $DIR/arguments.rs:14:8
   |
LL |         struct S;
   |                - you might have meant to refer to this struct
...
LL |     m!(S, S);
   |        ^ not found in this scope

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0412`.