"left behind trailing whitespace" error in enum with casts

[Seeker14491]

Attempting to format the following:

pub enum PublishedFileVisibility {
    Public = sys::ERemoteStoragePublishedFileVisibility_k_ERemoteStoragePublishedFileVisibilityPublic as i32,
    FriendsOnly = sys::ERemoteStoragePublishedFileVisibility_k_ERemoteStoragePublishedFileVisibilityFriendsOnly as i32,
    Private = sys::ERemoteStoragePublishedFileVisibility_k_ERemoteStoragePublishedFileVisibilityPrivate as i32,
}

produces this error:

error[internal]: left behind trailing whitespace
 --> /playground/src/main.rs:2:2:0
  |
2 |     
  | ^^^^
  |

warning: rustfmt has failed to format. See previous 1 errors.

Playground

This is the same testcase from #3562, but with as i32 appended to each variant.