Function vset_lane_u64 

pub fn vset_lane_u64(a: u64, b: uint64x1_t, const LANE: i32) -> uint64x1_t

Available on target feature neon and (AArch64 or ARM or ARM64EC) and (AArch64 or ARM64EC) and (AArch64 or ARM64EC or target feature v7) only.

Insert vector element from another vector element Arm’s documentation