This seems rather pointless; I’m having trouble coming up with an example where mconcat would be easier or more elegant to implement. Do you have an example?
On 24 Jan 2014, at 22:42, Niklas Haas
Hello,
I noticed that the current Monoid class doesn't actually provide default implementations of mappend/mempty in terms of mconcat, even though this is technically very simple:
mempty = mconcat [] mappend a b = mconcat [a, b]
This would be a rather small and non-invasive change that shouldn't break any existing programs. The main downside is that an empty Monoid declaration would produce no warnings, but #7633 gives us the ability to solve this.
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