Error found:
in module Main
at tests/purs/failing/CoercibleRepresentational.purs:11:20 - 11:26 (line 11, column 20 - line 11, column 26)

  No type class instance was found for
                            
    Prim.Coerce.Coercible a1
                          b3
                            

while solving type class constraint
                                        
  Prim.Coerce.Coercible (Phantom @t0 a1)
                        (Phantom @t2 b3)
                                        
while checking that type forall (a :: Type) (b :: Type). Coercible @Type a b => a -> b
  is at least as general as type Phantom @t0 a1 -> Phantom @t2 b3
while checking that expression coerce
  has type Phantom @t0 a1 -> Phantom @t2 b3
in value declaration phantomToPhantom

where a1 is a rigid type variable
        bound at (line 11, column 20 - line 11, column 26)
      b3 is a rigid type variable
        bound at (line 11, column 20 - line 11, column 26)
      t0 is an unknown type
      t2 is an unknown type

See https://github.com/purescript/documentation/blob/master/errors/NoInstanceFound.md for more information,
or to contribute content related to this error.