3 files changed, 43 insertions, 9 deletions
diff --git a/tests/crashes/132127.rs b/tests/crashes/132127.rs
deleted file mode 100644
index cca354b9876..00000000000
--- a/tests/crashes/132127.rs
+++ /dev/null
@@ -1,9 +0,0 @@
-//@ known-bug: #132127
-#![feature(dyn_star)]
-
-trait Trait {}
-
-fn main() {
-    let x: dyn* Trait + Send = 1usize;
-    x as dyn* Trait;
-}
diff --git a/tests/ui/dyn-star/illegal.rs b/tests/ui/dyn-star/illegal.rs
new file mode 100644
index 00000000000..ce0d784fcd2
--- /dev/null
+++ b/tests/ui/dyn-star/illegal.rs
@@ -0,0 +1,16 @@
+#![feature(dyn_star)]
+//~^ WARN the feature `dyn_star` is incomplete
+
+trait Foo {}
+
+pub fn lol(x: dyn* Foo + Send) {
+    x as dyn* Foo;
+    //~^ ERROR casting `(dyn* Foo + Send + 'static)` as `dyn* Foo` is invalid
+}
+
+fn lol2(x: &dyn Foo) {
+    *x as dyn* Foo;
+    //~^ ERROR `dyn Foo` needs to have the same ABI as a pointer
+}
+
+fn main() {}
diff --git a/tests/ui/dyn-star/illegal.stderr b/tests/ui/dyn-star/illegal.stderr
new file mode 100644
index 00000000000..fdf3c813a23
--- /dev/null
+++ b/tests/ui/dyn-star/illegal.stderr
@@ -0,0 +1,27 @@
+warning: the feature `dyn_star` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/illegal.rs:1:12
+   |
+LL | #![feature(dyn_star)]
+   |            ^^^^^^^^
+   |
+   = note: see issue #102425 <https://github.com/rust-lang/rust/issues/102425> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0606]: casting `(dyn* Foo + Send + 'static)` as `dyn* Foo` is invalid
+  --> $DIR/illegal.rs:7:5
+   |
+LL |     x as dyn* Foo;
+   |     ^^^^^^^^^^^^^
+
+error[E0277]: `dyn Foo` needs to have the same ABI as a pointer
+  --> $DIR/illegal.rs:12:5
+   |
+LL |     *x as dyn* Foo;
+   |     ^^ `dyn Foo` needs to be a pointer-like type
+   |
+   = help: the trait `PointerLike` is not implemented for `dyn Foo`
+
+error: aborting due to 2 previous errors; 1 warning emitted
+
+Some errors have detailed explanations: E0277, E0606.
+For more information about an error, try `rustc --explain E0277`.