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T4846.hs:29:1:
Could not coerce from ‛Expr Bool’ to ‛Expr BOOL’
because the first type argument of ‛Expr’ has role Nominal,
but the arguments ‛Bool’ and ‛BOOL’ differ
arising from a use of ‛GHC.Prim.coerce’
In the expression:
GHC.Prim.coerce (mkExpr :: Expr Bool) :: Expr BOOL
In an equation for ‛mkExpr’:
mkExpr = GHC.Prim.coerce (mkExpr :: Expr Bool) :: Expr BOOL
When typechecking the code for ‛mkExpr’
in a standalone derived instance for ‛B BOOL’:
To see the code I am typechecking, use -ddump-deriv
In the instance declaration for ‛B BOOL’
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