Add regression test for 133065

tests/ui/traits/trait-impl-self-mismatch.rs

@@ -0,0 +1,19 @@
+//@compile-flags: -Zvalidate-mir -Zinline-mir -Zinline-mir-threshold=300
+
+//! Ensure that a trait method implemented with the wrong signature
+//! correctly triggers a compile error and not an ICE.
+//! Regression test for <https://github.com/rust-lang/rust/issues/133065>.
+
+trait Bar {
+    fn bar(&self) {}
+}
+
+impl<T> Bar for T {
+    fn bar() { //~ ERROR method `bar` has a `&self` declaration in the trait, but not in the impl
+        let _ = "Hello".bytes().nth(3);
+    }
+}
+
+fn main() {
+    ().bar();
+}

tests/ui/traits/trait-impl-self-mismatch.stderr

@@ -0,0 +1,12 @@
+error[E0186]: method `bar` has a `&self` declaration in the trait, but not in the impl
+  --> $DIR/trait-impl-self-mismatch.rs:12:5
+   |
+LL |     fn bar(&self) {}
+   |     ------------- `&self` used in trait
+...
+LL |     fn bar() {
+   |     ^^^^^^^^ expected `&self` in impl
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0186`.