add test for #88212 ICE when lambda captures unsized local

Fixes #88212

2 files changed, 44 insertions, 0 deletions

diff --git a/tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.rs b/tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.rs
new file mode 100644
index 00000000000..1c43e3a4489
--- /dev/null
+++ b/tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.rs
@@ -0,0 +1,21 @@
+// ICE size_and_align_of::<[closure@test.rs:15:5: 17:7]> not supported #88212
+
+#![feature(unsized_locals)]
+//~^ WARN the feature `unsized_locals` is incomplete and may not be safe to use and/or cause compiler crashes
+
+trait Example {}
+struct Foo();
+
+impl Example for Foo {}
+
+fn example() -> Box<dyn Example> {
+    Box::new(Foo())
+}
+
+fn main() {
+    let x: dyn Example = *example();
+    (move || {
+        let _y = x;
+        //~^ ERROR the size for values of type `dyn Example` cannot be known at compilation time
+    })();
+}
diff --git a/tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.stderr b/tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.stderr
new file mode 100644
index 00000000000..a0253ac1f35
--- /dev/null
+++ b/tests/ui/unsized-locals/ice-size_and_align_of-closure-not-supported-88212.stderr
@@ -0,0 +1,23 @@
+warning: the feature `unsized_locals` is incomplete and may not be safe to use and/or cause compiler crashes
+  --> $DIR/ice-size_and_align_of-closure-not-supported-88212.rs:3:12
+   |
+LL | #![feature(unsized_locals)]
+   |            ^^^^^^^^^^^^^^
+   |
+   = note: see issue #48055 <https://github.com/rust-lang/rust/issues/48055> for more information
+   = note: `#[warn(incomplete_features)]` on by default
+
+error[E0277]: the size for values of type `dyn Example` cannot be known at compilation time
+  --> $DIR/ice-size_and_align_of-closure-not-supported-88212.rs:18:18
+   |
+LL |     (move || {
+   |           -- this closure captures all values by move
+LL |         let _y = x;
+   |                  ^ doesn't have a size known at compile-time
+   |
+   = help: the trait `Sized` is not implemented for `dyn Example`
+   = note: all values captured by value by a closure must have a statically known size
+
+error: aborting due to 1 previous error; 1 warning emitted
+
+For more information about this error, try `rustc --explain E0277`.