Function vset_lane_p8 

pub fn vset_lane_p8(a: u8, b: poly8x8_t, const LANE: i32) -> poly8x8_t

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

Insert vector element from another vector element Arm’s documentation