## Coercible solver regression: Couldn't match rep of () with Const () b

Hello, I ran into what appears to be a regression in the Coercible solver since 7.8.4. This is as small as I've managed to get my example case.

```
{-# LANGUAGE MultiParamTypeClasses #-}
{-# LANGUAGE FunctionalDependencies #-}
{-# LANGUAGE FlexibleContexts #-}
module Bug where
import Control.Applicative
import Data.Coerce
broken :: Bizarre (->) w => w a b t -> ()
broken = getConst #. bazaar (Const #. const ())
class Profunctor p where
(#.) :: Coercible c b => (b -> c) -> p a b -> p a c
instance Profunctor (->) where
(#.) = (.)
class Bizarre p w | w -> p where
bazaar :: Applicative f => p a (f b) -> w a b t -> f t
```

```
Bug.hs:10:36:
Couldn't match representation of type ‘()’
with that of ‘Const () b’
Relevant role signatures: type role Const representational phantom
Relevant bindings include
broken :: w a b t -> () (bound at Bug.hs:10:1)
In the first argument of ‘bazaar’, namely ‘(Const #. const ())’
In the second argument of ‘(#.)’, namely
‘bazaar (Const #. const ())’
In the expression: getConst #. bazaar (Const #. const ())
```