My first patch

Hello, Since I'm new here I will first introduce myself. My name is Krzysztof and I have more then 20 years experience with object oriented languages. Recently I learned about functional programming. And I really like it. Because my current project uses OO languages (no FP) I decided to try to engage with GHC development to learn Haskell. So here is my first patch. It is related to the ticket: https://ghc.haskell.org/trac/ghc/ticket/5412 I just changed error message so it should be easier (I hope) to understand what has happened. No functionality was changed. The patch is attached to the ticket. Should I submit it to someone to review? -- Thanks Krzysztof Langner