error[E0308]: mismatched types --> $DIR/issue-87812-path.rs:3:24 | LL | let _: usize = $f; | ----- ^^ expected `usize`, found `Baz` | | | expected due to this ... LL | foo!(Baz); | --------- in this macro invocation | = note: this error originates in the macro `foo` (in Nightly builds, run with -Z macro-backtrace for more info) error: aborting due to 1 previous error For more information about this error, try `rustc --explain E0308`.