Clarify what the effects of a 'logic error' are

library/alloc/src/collections/binary_heap.rs

@@ -161,7 +161,10 @@ use super::SpecExtend;
 /// It is a logic error for an item to be modified in such a way that the
 /// item's ordering relative to any other item, as determined by the `Ord`
 /// trait, changes while it is in the heap. This is normally only possible
-/// through `Cell`, `RefCell`, global state, I/O, or unsafe code.
+/// through `Cell`, `RefCell`, global state, I/O, or unsafe code. The
+/// behavior resulting from such a logic error is not specified, but will
+/// not result in undefined behavior. This could include panics, incorrect
+/// results, aborts, memory leaks, and non-termination.
 ///
 /// # Examples
 ///

library/alloc/src/collections/btree/map.rs

@@ -51,6 +51,9 @@ pub(super) const MIN_LEN: usize = node::MIN_LEN_AFTER_SPLIT;
 /// It is a logic error for a key to be modified in such a way that the key's ordering relative to
 /// any other key, as determined by the [`Ord`] trait, changes while it is in the map. This is
 /// normally only possible through [`Cell`], [`RefCell`], global state, I/O, or unsafe code.
+/// The behavior resulting from such a logic error is not specified, but will not result in
+/// undefined behavior. This could include panics, incorrect results, aborts, memory leaks, and
+/// non-termination.
 ///
 /// [`Cell`]: core::cell::Cell
 /// [`RefCell`]: core::cell::RefCell

library/alloc/src/collections/btree/set.rs

@@ -22,6 +22,9 @@ use super::Recover;
 /// It is a logic error for an item to be modified in such a way that the item's ordering relative
 /// to any other item, as determined by the [`Ord`] trait, changes while it is in the set. This is
 /// normally only possible through [`Cell`], [`RefCell`], global state, I/O, or unsafe code.
+/// The behavior resulting from such a logic error is not specified, but will not result in
+/// undefined behavior. This could include panics, incorrect results, aborts, memory leaks, and
+/// non-termination.
 ///
 /// [`Ord`]: core::cmp::Ord
 /// [`Cell`]: core::cell::Cell