Auto merge of #96622 - JohnTitor:rollup-8hckgaj, r=JohnTitor

Rollup of 7 pull requests

Successful merges:

 - #94126 (Classify BinaryHeap & LinkedList unit tests as such)
 - #96222 (Clarify docs for `from_raw_parts` on `Vec` and `String`)
 - #96499 (Make it possible to write doctests for bootstrap)
 - #96567 (Fix docs for u32 and i32 logs func)
 - #96568 (std::fmt: Various fixes and improvements to documentation)
 - #96571 (Add a bathroom stall to weird expressions test)
 - #96610 (Update browser-ui-test version to 0.9.0)

Failed merges:

r? `@ghost`
`@rustbot` modify labels: rollup

1 files changed, 4 insertions, 1 deletions

diff --git a/library/alloc/src/string.rs b/library/alloc/src/string.rs
index e97c1637fd5..2272c5b7330 100644
--- a/library/alloc/src/string.rs
+++ b/library/alloc/src/string.rs
@@ -770,7 +770,10 @@ impl String {
     /// * The first `length` bytes at `buf` need to be valid UTF-8.
     ///
     /// Violating these may cause problems like corrupting the allocator's
-    /// internal data structures.
+    /// internal data structures. For example, it is normally **not** safe to
+    /// build a `String` from a pointer to a C `char` array containing UTF-8
+    /// _unless_ you are certain that array was originally allocated by the
+    /// Rust standard library's allocator.
     ///
     /// The ownership of `buf` is effectively transferred to the
     /// `String` which may then deallocate, reallocate or change the