error: encountered diff marker
  --> $DIR/fn-arg.rs:3:1
   |
LL | <<<<<<< HEAD
   | ^^^^^^^ after this is the code before the merge
LL |         x: u8,
LL | =======
   | -------
LL |         x: i8,
LL | >>>>>>> branch
   | ^^^^^^^ above this are the incoming code changes
   |
   = help: if you're having merge conflicts after pulling new code, the top section is the code you already had and the bottom section is the remote code
   = help: if you're in the middle of a rebase, the top section is the code being rebased onto and the bottom section is the code coming from the current commit being rebased
   = note: for an explanation on these markers from the `git` documentation, visit <https://git-scm.com/book/en/v2/Git-Tools-Advanced-Merging#_checking_out_conflicts>

error: aborting due to 1 previous error