error[E0412]: cannot find type `It` in this scope
  --> $DIR/issue-77993-1.rs:3:9
   |
LL |     it: It,
   |         ^^ not found in this scope

error[E0063]: missing field `it` in initializer of `InGroup<_>`
  --> $DIR/issue-77993-1.rs:8:5
   |
LL |     InGroup { f: |d| d }
   |     ^^^^^^^ missing `it`

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0063, E0412.
For more information about an error, try `rustc --explain E0063`.