Pattern matching is one of the most elegant Haskell features.

I've been working on a project recently where I need a queue data structure so I'm using Data.Sequence. However, it looks like I have to give up the elegance of pattern matching and resort to guards:

floodFillWorker :: Image -> RGBAColor -> Double -> PixelQueue -> Image
floodFillWorker image base tolerance queue 
    | Seq.null queue = image
    | otherwise      = doSomeWork image

Can I use pattern matching with sequences or do I need to use guards?

haskell pattern-matching
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