add test for issue 84957

src/test/ui/consts/const-eval/issue-84957-const-str-as-bytes.rs

@@ -0,0 +1,28 @@
+// build-pass
+
+trait Foo {}
+
+struct Bar {
+    bytes: &'static [u8],
+    func: fn(&Box<dyn Foo>),
+}
+fn example(_: &Box<dyn Foo>) {}
+
+const BARS: &[Bar] = &[
+    Bar {
+        bytes: "0".as_bytes(),
+        func: example,
+    },
+    Bar {
+        bytes: "0".as_bytes(),
+        func: example,
+    },
+];
+
+fn main() {
+    let x = todo!();
+
+    for bar in BARS {
+        (bar.func)(&x);
+    }
+}