error: expected a literal
  --> $DIR/issue-11692-2.rs:2:13
   |
LL |     concat!(test!()); //~ ERROR cannot find macro `test!` in this scope
   |             ^^^^^^^
   |
   = note: only literals (like `"foo"`, `42` and `3.14`) can be passed to `concat!()`

error: cannot find macro `test!` in this scope
  --> $DIR/issue-11692-2.rs:2:13
   |
LL |     concat!(test!()); //~ ERROR cannot find macro `test!` in this scope
   |             ^^^^

error: aborting due to 2 previous errors