On a fixed-vow day, another obligatory fast was intended before true dawn. What is the result in the taught example?

Four Types of Timed Worship: The Role of Time

• The other obligatory fast is performed; the vowed fast remains Qada
• The vowed fast is performed; the other intention is irrelevant
• Both duties are discharged by two fasts in one interval
• The vowed duty disappears without performance or Qada