[Haskell-cafe] Does GHC recognise that CmpSymbol s1 s2 ~ EQ implies s1 ~ s2 ?

[Evgeny Permyakov]

By semantic
 CmpSymbol s1 s2 ~ EQ should be equivalent to s1 ~ s2 for s1 , s2 :: Symbol

Does GHC recognize it? If not, is there some trick to obtain evidence of
the second constraint from the first ? I'm talking about context of type
class instance declarations.
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