rustup

Author: RalfJung

rust-src.diff

@@ -1,98 +0,0 @@
-diff --git a/library/alloc/src/vec/in_place_collect.rs b/library/alloc/src/vec/in_place_collect.rs
-index e4f96fd7640..cbf209a9090 100644
---- a/library/alloc/src/vec/in_place_collect.rs
-+++ b/library/alloc/src/vec/in_place_collect.rs
-@@ -168,7 +168,7 @@ const fn in_place_collectible<DEST, SRC>(
-     step_merge: Option<NonZeroUsize>,
-     step_expand: Option<NonZeroUsize>,
- ) -> bool {
--    if DEST::IS_ZST || mem::align_of::<SRC>() < mem::align_of::<DEST>() {
-+    if const { SRC::IS_ZST || DEST::IS_ZST || mem::align_of::<SRC>() < mem::align_of::<DEST>() } {
-         return false;
-     }
- 
-@@ -186,6 +186,32 @@ const fn in_place_collectible<DEST, SRC>(
-     }
- }
- 
-+const fn needs_realloc<SRC, DEST>(src_cap: usize, dst_cap: usize) -> bool {
-+    if const { mem::align_of::<SRC>() != mem::align_of::<DEST>() } {
-+        return true;
-+    }
-+
-+    if const {
-+        // examples that may require reallocs unless src/dest capacities turn out to be multiples at runtime
-+        // Vec<u8> -> Vec<[u8; 4]>
-+        let dst_larger = mem::size_of::<SRC>() < mem::size_of::<DEST>();
-+
-+        // Vec<[u8; 3]> -> Vec<[u8; 2]>
-+        // dest_sz can't actually be 0 since in_place_collectible() checks for that but const eval doesn't know that
-+        let dest_sz = mem::size_of::<DEST>();
-+        let src_not_multiple_of_dest =
-+            dest_sz == 0 || mem::size_of::<SRC>() % mem::size_of::<DEST>() != 0;
-+
-+        dst_larger || src_not_multiple_of_dest
-+    } {
-+        return src_cap * mem::size_of::<SRC>() != dst_cap * mem::size_of::<DEST>();
-+    }
-+
-+    // Equal size + alignment won't need a realloc.
-+    // src size being an integer multiple of the dest size works too
-+    return false;
-+}
-+
- /// This provides a shorthand for the source type since local type aliases aren't a thing.
- #[rustc_specialization_trait]
- trait InPlaceCollect: SourceIter<Source: AsVecIntoIter> + InPlaceIterable {
-@@ -259,12 +285,7 @@ impl<T, I> SpecFromIter<T, I> for Vec<T>
-         // that wasn't a multiple of the destination type size.
-         // Since the discrepancy should generally be small this should only result in some
-         // bookkeeping updates and no memmove.
--        if (const {
--            let src_sz = mem::size_of::<I::Src>();
--            src_sz > 0 && mem::size_of::<T>() % src_sz != 0
--        } && src_cap * mem::size_of::<I::Src>() != dst_cap * mem::size_of::<T>())
--            || const { mem::align_of::<T>() != mem::align_of::<I::Src>() }
--        {
-+        if needs_realloc::<I::Src, T>(src_cap, dst_cap) {
-             let alloc = Global;
-             unsafe {
-                 // The old allocation exists, therefore it must have a valid layout.
-@@ -286,6 +307,8 @@ impl<T, I> SpecFromIter<T, I> for Vec<T>
-                 let Ok(reallocated) = result else { handle_alloc_error(new_layout) };
-                 dst_buf = reallocated.as_ptr() as *mut T;
-             }
-+        } else {
-+            debug_assert_eq!(src_cap * mem::size_of::<I::Src>(), dst_cap * mem::size_of::<T>());
-         }
- 
-         mem::forget(dst_guard);
-diff --git a/library/alloc/tests/vec.rs b/library/alloc/tests/vec.rs
-index 81de7085e09..3d3175ba3a9 100644
---- a/library/alloc/tests/vec.rs
-+++ b/library/alloc/tests/vec.rs
-@@ -1213,6 +1213,14 @@ fn assert_in_place_trait<T: InPlaceIterable>(_: &T) {}
-     assert_ne!(src_bytes, sink_bytes);
-     assert_eq!(sink.len(), 2);
- 
-+    let mut src: Vec<[u8; 3]> = Vec::with_capacity(17);
-+    src.resize( 8, [0; 3]);
-+    let iter = src.into_iter().map(|[a, b, _]| [a, b]);
-+    assert_in_place_trait(&iter);
-+    let sink: Vec<[u8; 2]> = iter.collect();
-+    assert_eq!(sink.len(), 8);
-+    assert!(sink.capacity() <= 25);
-+
-     let src = vec![[0u8; 4]; 256];
-     let srcptr = src.as_ptr();
-     let iter = src
-diff --git a/library/portable-simd/crates/core_simd/tests/pointers.rs b/library/portable-simd/crates/core_simd/tests/pointers.rs
-index a90ff928ced..b9f32d16e01 100644
---- a/library/portable-simd/crates/core_simd/tests/pointers.rs
-+++ b/library/portable-simd/crates/core_simd/tests/pointers.rs
-@@ -1,4 +1,4 @@
--#![feature(portable_simd, strict_provenance)]
-+#![feature(portable_simd, strict_provenance, exposed_provenance)]
- 
- use core_simd::simd::{
-     ptr::{SimdConstPtr, SimdMutPtr},

rust-version

@@ -1 +1 @@
-nightly-2023-12-04
+nightly-2023-12-07