Failed attempt.
Successful attempt.
Creates an unsuccessful attempt.
Creates an attempt from the supplied either.
Creates an attempt from the supplied option.
Creates an attempt from the supplied option. The ifNone value is used as the success value if opt is None.
Creates an attempt from the supplied option.
Creates an attempt from the supplied option. The ifNone value is used as the error message if opt is None.
Creates a successful attempt.
Companion for Attempt.