Auto merge of #54596 - mjbshaw:drop, r=RalfJung

Make core::mem::needs_drop a const fn

This fixes #51929.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/libcore/mem.rs b/src/libcore/mem.rs
index 9871f496678..f537add999a 100644
--- a/src/libcore/mem.rs
+++ b/src/libcore/mem.rs
@@ -455,6 +455,16 @@ pub fn align_of_val<T: ?Sized>(val: &T) -> usize {
 /// ```
 #[inline]
 #[stable(feature = "needs_drop", since = "1.21.0")]
+#[rustc_const_unstable(feature = "const_needs_drop")]
+#[cfg(not(stage0))]
+pub const fn needs_drop<T>() -> bool {
+    intrinsics::needs_drop::<T>()
+}
+
+#[inline]
+#[stable(feature = "needs_drop", since = "1.21.0")]
+#[cfg(stage0)]
+/// Ceci n'est pas la documentation
 pub fn needs_drop<T>() -> bool {
     unsafe { intrinsics::needs_drop::<T>() }
 }