From e788410007831b266a6dcae677223ba70172b9f6 Mon Sep 17 00:00:00 2001
From: Trevor Gross <tmgross@umich.edu>
Date: Mon, 14 Oct 2024 17:15:53 -0400
Subject: [PATCH] Mark LazyCell::into_inner unstably const

Other cell `into_inner` functions are const and there shouldn't be any
problem here. Make the unstable `LazyCell::into_inner` const under the
same gate as its stability (`lazy_cell_into_inner`).

Tracking issue: https://github.com/rust-lang/rust/issues/125623
---
 core/src/cell/lazy.rs | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/core/src/cell/lazy.rs b/core/src/cell/lazy.rs
index 5bc13779af9f8..d323fbeac9c10 100644
--- a/core/src/cell/lazy.rs
+++ b/core/src/cell/lazy.rs
@@ -79,7 +79,7 @@ impl<T, F: FnOnce() -> T> LazyCell<T, F> {
     /// assert_eq!(LazyCell::into_inner(lazy).ok(), Some("HELLO, WORLD!".to_string()));
     /// ```
     #[unstable(feature = "lazy_cell_into_inner", issue = "125623")]
-    pub fn into_inner(this: Self) -> Result<T, F> {
+    pub const fn into_inner(this: Self) -> Result<T, F> {
         match this.state.into_inner() {
             State::Init(data) => Ok(data),
             State::Uninit(f) => Err(f),
@@ -306,6 +306,6 @@ impl<T: fmt::Debug, F> fmt::Debug for LazyCell<T, F> {
 
 #[cold]
 #[inline(never)]
-fn panic_poisoned() -> ! {
+const fn panic_poisoned() -> ! {
     panic!("LazyCell instance has previously been poisoned")
 }