diff --git a/tests/ui/auto-traits/issue-83857-ub.rs b/tests/ui/auto-traits/issue-83857-ub.rs
index 0a8865295c6..626e60c37f6 100644
--- a/tests/ui/auto-traits/issue-83857-ub.rs
+++ b/tests/ui/auto-traits/issue-83857-ub.rs
@@ -1,4 +1,6 @@
 #![allow(suspicious_auto_trait_impls)]
+// Tests that we don't incorrectly allow overlap between a builtin auto trait
+// impl and a user written one. See #83857 for more details
 
 struct Always<T, U>(T, U);
 unsafe impl<T, U> Send for Always<T, U> {}
diff --git a/tests/ui/auto-traits/issue-83857-ub.stderr b/tests/ui/auto-traits/issue-83857-ub.stderr
index d2aef17e7f8..23a2f62d905 100644
--- a/tests/ui/auto-traits/issue-83857-ub.stderr
+++ b/tests/ui/auto-traits/issue-83857-ub.stderr
@@ -1,12 +1,12 @@
 error[E0277]: `Foo<T, U>` cannot be sent between threads safely
-  --> $DIR/issue-83857-ub.rs:20:38
+  --> $DIR/issue-83857-ub.rs:22:38
    |
 LL | fn generic<T, U>(v: Foo<T, U>, f: fn(<Foo<T, U> as WithAssoc>::Output) -> i32) {
    |                                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ `Foo<T, U>` cannot be sent between threads safely
    |
    = help: the trait `Send` is not implemented for `Foo<T, U>`
 note: required for `Foo<T, U>` to implement `WithAssoc`
-  --> $DIR/issue-83857-ub.rs:13:15
+  --> $DIR/issue-83857-ub.rs:15:15
    |
 LL | impl<T: Send> WithAssoc for T {
    |         ----  ^^^^^^^^^     ^
diff --git a/tests/ui/impl-trait/auto-trait-leak b/tests/ui/impl-trait/auto-trait-leak
deleted file mode 100644
index e69de29bb2d..00000000000