[Haskell-beginners] Unmaybe

[Adrian May]

Hi there,

I have a really annoying scrap of code:

unmaybe Nothing = mempty
unmaybe (Just dia) = dia

It happened because I'm using Diagrams but building my diagram requires
looking something up in a list using findIndex, which returns Maybe Int.

How do I rid myself of this blotch?

TIA,
Adrian.
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