What is the syntactic case of «عُمَرَ» in «مَرَرْتُ بِعُمَرَ»?

Noun Case Classes: Type 3 — Diptote (Ghayr Munṣarif)

• Accusative because it ends in fatḥa
• Genitive because bi- is a preposition
• Nominative because it is the subject
• Indeclinable with no case