Error found:
in module Main
at tests/purs/failing/ProgrammablePolykindedTypeErrorsTypeString.purs:23:7 - 23:17 (line 23, column 7 - line 23, column 17)

  A custom type error occurred while solving type class constraints:

    Don't want to show Just @Type String because.


while checking that type Fail (Beside (Beside (Text "Don\'t want to show ") (... ...)) (Text " because.")) => String
  is at least as general as type String
while checking that expression someString
  has type String
in value declaration main

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