Function svclasta_s8 

pub fn svclasta_s8(pg: svbool_t, fallback: svint8_t, data: svint8_t) -> svint8_t

🔬This is a nightly-only experimental API. (stdarch_aarch64_sve #145052)

Available on (AArch64 or ARM64EC) and target feature sve only.

Conditionally extract element after last Arm’s documentation