error: `$a:expr` is followed by `$b:tt`, which is not allowed for `expr` fragments
  --> $DIR/macro-followed-by-seq-bad.rs:7:15
   |
LL |   ( $a:expr $($b:tt)* ) => { };
   |               ^^^^^ not allowed after `expr` fragments
   |
   = note: allowed there are: `=>`, `,` or `;`

error: `$a:ty` is followed by `$b:tt`, which is not allowed for `ty` fragments
  --> $DIR/macro-followed-by-seq-bad.rs:8:13
   |
LL |   ( $a:ty $($b:tt)* ) => { };
   |             ^^^^^ not allowed after `ty` fragments
   |
   = note: allowed there are: `{`, `[`, `=>`, `,`, `>`, `=`, `:`, `;`, `|`, `as` or `where`

error: aborting due to 2 previous errors