Error found:
in module Main
at tests/purs/failing/CoercibleNominalTypeApp.purs:13:8 - 13:14 (line 13, column 8 - line 13, column 14)

  Could not match type
       
    Int
       
  with type
          
    String
          

while solving type class constraint
                                              
  Prim.Coerce.Coercible (G @Type Maybe Int)   
                        (G @Type Maybe String)
                                              
while checking that type forall (a :: Type) (b :: Type). Coercible @Type a b => a -> b
  is at least as general as type G @Type Maybe Int -> G @Type Maybe String
while checking that expression coerce
  has type G @Type Maybe Int -> G @Type Maybe String
in value declaration gToG

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