Hi Norman,
Usually in the compiler Semigoup's <> is imported qualified. But I agree
it's ugly.
The trouble with Outputable's <> is that:
1) it doesn't have the same associativity as Semigroup's <>
2) <+> interacts weirdly with <> (cf
https://mail.haskell.org/pipermail/libraries/2011-November/
I find myself wanting to define instances of Semigroup (and Monoid)
in a file that also imports GHC.Utils.Outputable and its `<>` operation
on SDocs. At the moment I am dealing with the incompatibility by
hiding the Outputable version and instead of writing `s1 <> s2` I write
`hcat [s1, s2]`. Thi
