[xmonad] Policy on haskell version

[Willem Van Lint]

Hi,

I was wondering what haskell version we should keep in mind when
programming?
For example, the language pragma PatternGuards is still used in the code
although pattern guards are included in the Haskell 2010 standard.
Do I need to strive for backwards compatibility and in how far can we use
recent language extensions?

Best regards,

Willem Van Lint
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