zeroize 0.3.0

Securely zero memory while avoiding compiler optimizations: cross-platform secure intrinsics for zeroing memory, using FFI to invoke OS intrinsics on stable Rust (with support for Linux, Windows, macOS/iOS, FreeBSD, OpenBSD, NetBSD, DragonflyBSD), or the unstable 'volatile_set_memory()` intrinsic on nightly. No insecure fallbacks, no dependencies, no std, no functionality besides securely zeroing memory.
Documentation 
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//! nightly: use the `volatile_set_memory` intrinsic

use core::intrinsics::volatile_set_memory;

/// Zero out memory using `core::intrinsics::volatile_set_memory`
///
/// The volatile parameter is set to true, so it will not be optimized out
/// unless size is equal to zero.
pub(crate) fn secure_zero_memory(bytes: &mut [u8]) {
    unsafe { volatile_set_memory(bytes.as_mut_ptr(), 0, bytes.len()) }
}