Add `rustc_confusables` annotations to some stdlib APIs

Help with common API confusion, like asking for `push` when the data structure really has `append`.

```
error[E0599]: no method named `size` found for struct `Vec<{integer}>` in the current scope
  --> $DIR/rustc_confusables_std_cases.rs:17:7
   |
LL |     x.size();
   |       ^^^^
   |
help: you might have meant to use `len`
   |
LL |     x.len();
   |       ~~~
help: there is a method with a similar name
   |
LL |     x.resize();
   |       ~~~~~~
```

#59450

1 files changed, 2 insertions, 0 deletions

diff --git a/library/std/src/thread/local.rs b/library/std/src/thread/local.rs
index d1213e2f166..34d30a259ee 100644
--- a/library/std/src/thread/local.rs
+++ b/library/std/src/thread/local.rs
@@ -435,6 +435,7 @@ impl<T: 'static> LocalKey<Cell<T>> {
     /// assert_eq!(X.replace(3), 2);
     /// ```
     #[stable(feature = "local_key_cell_methods", since = "1.73.0")]
+    #[rustc_confusables("swap")]
     pub fn replace(&'static self, value: T) -> T {
         self.with(|cell| cell.replace(value))
     }
@@ -606,6 +607,7 @@ impl<T: 'static> LocalKey<RefCell<T>> {
     /// X.with_borrow(|v| assert_eq!(*v, vec![1, 2, 3]));
     /// ```
     #[stable(feature = "local_key_cell_methods", since = "1.73.0")]
+    #[rustc_confusables("swap")]
     pub fn replace(&'static self, value: T) -> T {
         self.with(|cell| cell.replace(value))
     }