The fibonacci function uses a while loop with mutable variables. The := operator is used inside the loop (i = i + 1) to reassign. Variables declared with an explicit type annotation like a: i64 = 0 can be reassigned with =.
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但苹果的入场时机恰好卡在"积累期的窗口内"。如果iPhone Fold在今年9月发布，可能会在PersonaX尚未完全成熟、合作生态尚未铺开时，凭借完整的iOS生态对高端用户形成直接分流。