Derive Show instances for Sigma/SSigma when possible#634
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On GHC 9.2 or later, it is possible to derive the `Show` instances for `Sigma` and `SSigma`, which is nice. Unfortunately, this doesn't work on pre-9.2 versions of GHC (see https://gitlab.haskell.org/ghc/ghc/-/issues/14860#note_454218), so some CPP is required. While I'm in town, this adds some comments to make it clear that we intentionally want the behavior of derived `Show` instances. As such, this resolves #633.
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On GHC 9.2 or later, it is possible to derive the
Showinstances forSigmaandSSigma, which is nice. Unfortunately, this doesn't work on pre-9.2 versions of GHC (see https://gitlab.haskell.org/ghc/ghc/-/issues/14860#note_454218), so some CPP is required.While I'm in town, this adds some comments to make it clear that we intentionally want the behavior of derived
Showinstances. As such, this resolves #633.