error: expected pattern, found `$`
  --> $DIR/issue-116781.rs:4:16
   |
LL |     field: fn(($),),
   |                ^ expected pattern

error: expected pattern, found `$`
  --> $DIR/issue-116781.rs:4:16
   |
LL |     field: fn(($),),
   |                ^ expected pattern
   |
   = note: duplicate diagnostic emitted due to `-Z deduplicate-diagnostics=no`

error: aborting due to 2 previous errors