Move negative_impls test from run-pass to ui

tests/run-pass/negative_impls.rs → tests/ui/unstable-features/negative_impls.rs

@@ -1,4 +1,5 @@
 #![feature(negative_impls)]
+#![deny(suspicious_auto_trait_impls)]
 
 // https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/design.20meeting.3A.20backlog.20bonanza/near/269471299
 // https://github.com/taiki-e/pin-project/issues/340

tests/ui/unstable-features/negative_impls.stderr

@@ -0,0 +1,24 @@
+error: cross-crate traits with a default impl, like `Unpin`, should not be specialized
+  --> tests/ui/unstable-features/negative_impls.rs:17:1
+   |
+17 | impl Unpin for Foo<MyPhantomPinned, ()> {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+note: the lint level is defined here
+  --> tests/ui/unstable-features/negative_impls.rs:2:9
+   |
+2  | #![deny(suspicious_auto_trait_impls)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   = warning: this will change its meaning in a future release!
+   = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
+   = note: `MyPhantomPinned` is not a generic parameter
+note: try using the same sequence of generic parameters as the struct definition
+  --> tests/ui/unstable-features/negative_impls.rs:8:1
+   |
+8  | / struct Foo<Pinned, Unpinned> {
+9  | |     #[pin]
+10 | |     pinned: Pinned,
+11 | |
+12 | |     unpinned: Unpinned,
+13 | | }
+   | |_^