Add regression test for rust-lang#54582

Author: estebank

src/test/ui/issues/issue-54582.rs

@@ -0,0 +1,16 @@
+// run-pass
+
+pub trait Stage: Sync {}
+
+pub enum Enum {
+    A,
+    B,
+}
+
+impl Stage for Enum {}
+
+pub static ARRAY: [(&Stage, &str); 1] = [
+    (&Enum::A, ""),
+];
+
+fn main() {}