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Commit7f1518b

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Add instability attribute on private const_strlen function
A `rustc_const_stable` attribute by itself has nonintuitive purpose whenplaced 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-purposeimplementation of strlen now, not something specifically for const(avoiding confusion like in PR 127444).
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‎library/core/src/ffi/c_str.rs‎

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@@ -740,6 +740,7 @@ impl AsRef<CStr> for CStr {
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/// The pointer must point to a valid buffer that contains a NUL terminator. The NUL must be
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/// located within `isize::MAX` from `ptr`.
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#[inline]
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#[unstable(feature ="cstr_internals", issue ="none")]
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#[rustc_const_stable(feature ="const_cstr_from_ptr", since ="CURRENT_RUSTC_VERSION")]
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#[rustc_allow_const_fn_unstable(const_eval_select)]
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constunsafefnconst_strlen(ptr:*constc_char) ->usize{

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