RFC 2027: "first draft" of implementation

These are a squashed series of commits.

1 files changed, 18 insertions, 0 deletions

diff --git a/src/test/ui/coherence/coherence-unsafe-trait-object-impl.rs b/src/test/ui/coherence/coherence-unsafe-trait-object-impl.rs
new file mode 100644
index 00000000000..9859a226efd
--- /dev/null
+++ b/src/test/ui/coherence/coherence-unsafe-trait-object-impl.rs
@@ -0,0 +1,18 @@
+// Check that unsafe trait object do not implement themselves
+// automatically
+
+#![feature(object_safe_for_dispatch)]
+
+trait Trait: Sized {
+    fn call(&self);
+}
+
+fn takes_t<S: Trait>(s: S) {
+    s.call();
+}
+
+fn takes_t_obj(t: &dyn Trait) {
+    takes_t(t); //~ ERROR E0277
+}
+
+fn main() {}