Function non_zero_realloc 

pub unsafe fn non_zero_realloc(
    ptr: *mut u8,
    layout: Layout,
    new_size: usize,
) -> *mut u8

std::alloc::realloc counterpart of non_zero_alloc.

Safety

Same as std::alloc::realloc. layout must be the current layout of ptr and new_size must be non-zero.