Unrendered `@since` annotations
Originally opened at https://github.com/haskell/haddock/issues/1577 by @treeowl:
I just noticed that the rendered documentation for
Data.Semigroup
is missing@since
annotations forGeneric
andGeneric1
instances. I figured that someone must have forgotten to put them in, but that is not the case! See, for example, the documentation forLast
vs. the source forLast
. While all the derived instances have@since
annotations in the source, not all of them are rendered.