Auto merge of rust-lang#126556 - saethlin:layout-precondition, r=<try>

Add a precondition check for Layout::from_size_align_unchecked

Ran into this while looking into rust-lang/miri#3679. This is of course not the cause of the ICE, but the reproducer doesn't encounter a precondition check and it ought to.

Author: bors

library/core/src/alloc/layout.rs

@@ -6,7 +6,7 @@
 
 use crate::error::Error;
 use crate::ptr::{Alignment, NonNull};
-use crate::{cmp, fmt, mem};
+use crate::{assert_unsafe_precondition, cmp, fmt, mem};
 
 // While this function is used in one place and its implementation
 // could be inlined, the previous attempts to do so made rustc
@@ -116,6 +116,15 @@ impl Layout {
     #[inline]
     #[rustc_allow_const_fn_unstable(ptr_alignment_type)]
     pub const unsafe fn from_size_align_unchecked(size: usize, align: usize) -> Self {
+        assert_unsafe_precondition!(
+            check_library_ub,
+            "Layout::from_size_align_unchecked requires that align is a power of 2 \
+            and the rounded-up allocation size does not exceed isize::MAX",
+            (
+                size: usize = size,
+                align: usize = align,
+            ) => Layout::from_size_align(size, align).is_ok()
+        );
         // SAFETY: the caller is required to uphold the preconditions.
         unsafe { Layout { size, align: Alignment::new_unchecked(align) } }
     }

library/core/src/result.rs

@@ -1481,7 +1481,6 @@ impl<T, E> Result<T, E> {
     #[track_caller]
     #[stable(feature = "option_result_unwrap_unchecked", since = "1.58.0")]
     pub unsafe fn unwrap_unchecked(self) -> T {
-        debug_assert!(self.is_ok());
         match self {
             Ok(t) => t,
             // SAFETY: the safety contract must be upheld by the caller.
@@ -1513,7 +1512,6 @@ impl<T, E> Result<T, E> {
     #[track_caller]
     #[stable(feature = "option_result_unwrap_unchecked", since = "1.58.0")]
     pub unsafe fn unwrap_err_unchecked(self) -> E {
-        debug_assert!(self.is_err());
         match self {
             // SAFETY: the safety contract must be upheld by the caller.
             Ok(_) => unsafe { hint::unreachable_unchecked() },