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Add instability attribute on private const_strlen function 

A `rustc_const_stable` attribute by itself has nonintuitive purpose when
placed in a public module.

Separately, it would probably be okay to rename `const_strlen` to just
`strlen` to make it more clear this is our general-purpose
implementation of strlen now, not something specifically for const
(avoiding confusion like in PR 127444).
This commit is contained in:
David Tolnay 2024-07-11 20:12:43 -07:00
parent 53d3e6217b
commit 7f1518bddd
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library/core/src/ffi/c_str.rs
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@ -740,6 +740,7 @@ impl AsRef<CStr> for CStr {
/// The pointer must point to a valid buffer that contains a NUL terminator. The NUL must be
/// located within `isize::MAX` from `ptr`.
#[inline]
#[unstable(feature = "cstr_internals", issue = "none")]
#[rustc_const_stable(feature = "const_cstr_from_ptr", since = "CURRENT_RUSTC_VERSION")]
#[rustc_allow_const_fn_unstable(const_eval_select)]
const unsafe fn const_strlen(ptr: *const c_char) -> usize {