From 91c53c97a990e9d1ab87b2d932362a53236fba49 Mon Sep 17 00:00:00 2001
From: Michael Goulet <michael@errs.io>
Date: Wed, 2 Jul 2025 00:32:54 +0000
Subject: Consider polarity in sizedness fast path

---
 tests/ui/traits/negative-bounds/negative-sized.rs     |  8 ++++++++
 tests/ui/traits/negative-bounds/negative-sized.stderr | 15 +++++++++++++++
 2 files changed, 23 insertions(+)
 create mode 100644 tests/ui/traits/negative-bounds/negative-sized.rs
 create mode 100644 tests/ui/traits/negative-bounds/negative-sized.stderr

(limited to 'tests')

diff --git a/tests/ui/traits/negative-bounds/negative-sized.rs b/tests/ui/traits/negative-bounds/negative-sized.rs
new file mode 100644
index 00000000000..18369c78427
--- /dev/null
+++ b/tests/ui/traits/negative-bounds/negative-sized.rs
@@ -0,0 +1,8 @@
+#![feature(negative_bounds)]
+
+fn foo<T: !Sized>() {}
+
+fn main() {
+    foo::<()>();
+    //~^ ERROR the trait bound `(): !Sized` is not satisfied
+}
diff --git a/tests/ui/traits/negative-bounds/negative-sized.stderr b/tests/ui/traits/negative-bounds/negative-sized.stderr
new file mode 100644
index 00000000000..143933803b8
--- /dev/null
+++ b/tests/ui/traits/negative-bounds/negative-sized.stderr
@@ -0,0 +1,15 @@
+error[E0277]: the trait bound `(): !Sized` is not satisfied
+  --> $DIR/negative-sized.rs:6:11
+   |
+LL |     foo::<()>();
+   |           ^^ the trait bound `(): !Sized` is not satisfied
+   |
+note: required by a bound in `foo`
+  --> $DIR/negative-sized.rs:3:11
+   |
+LL | fn foo<T: !Sized>() {}
+   |           ^^^^^^ required by this bound in `foo`
+
+error: aborting due to 1 previous error
+
+For more information about this error, try `rustc --explain E0277`.
-- 
cgit 1.4.1-3-g733a5