Rollup merge of #89997 - cameron1024:const-str-as-bytes-ice, r=JohnTitor

Add test for issue #84957 - `str.as_bytes()` in a `const` expression

Hi, this PR adds a test for issue #84957 . I'm quite new to rustc so let me know if there's anything else that needs doing 😄

Closes #84957

Author: matthiaskrgr

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);
+    }
+}