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T4846.hs:29:1: error:
Couldn't match type ‘Bool’ with ‘BOOL’
arising from a use of ‘coerce’
In the expression: coerce (mkExpr :: Expr Bool) :: Expr BOOL
In an equation for ‘mkExpr’:
mkExpr = coerce (mkExpr :: Expr Bool) :: Expr BOOL
When typechecking the code for ‘mkExpr’
in a 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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