error[E0308]: mismatched types
  --> $DIR/enum-discr-type-err.rs:18:21
   |
LL |               $( $v = $s::V, )*
   |                       ^^^^^ expected isize, found i32
...
LL | / mac! {
LL | |     A = F,
LL | |     B = T,
LL | | }
   | |_- in this macro invocation
help: you can convert an `i32` to `isize` and panic if the converted value wouldn't fit
   |
LL |             $( $v = $s::V.try_into().unwrap(), )*
   |                     ^^^^^^^^^^^^^^^^^^^^^^^^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.