Too many spaces in error message

[rl-king]

Quick Summary:
Having duplicate arguments in a function head will render a lot of spaces in the error message.

SSCCE

module Main exposing (main)

main x x =
    ()

• Elm: 0.19.1
• Operating System: macOS 10.14.6 / terminal.app

Additional Details

Same as #2012

Had this issue with the following code after it crashed emacs flycheck.

update msg ((State state_) as state_) =