(diagnostic
  (schema slovo.diagnostic)
  (version 1)
  (severity error)
  (code NonExhaustiveMatch)
  (message "match is missing `Color.Blue` arm(s)")
  (file "<fixture>")
  (span
    (bytes 60 99)
    (range 7 3 8 21)
  )
  (expected "Color.Red and Color.Blue")
  (found "Color.Red")
)