1 files changed, 27 insertions, 0 deletions
diff --git a/src/test/ui/consts/unstable-const-fn-in-libcore.rs b/src/test/ui/consts/unstable-const-fn-in-libcore.rs
new file mode 100644
index 000000000..16b36c8d5
--- /dev/null
+++ b/src/test/ui/consts/unstable-const-fn-in-libcore.rs
@@ -0,0 +1,27 @@
+// This is a non-regression test for const-qualification of unstable items in libcore
+// as explained in issue #67053.
+// const-qualification could miss some `const fn`s if they were unstable and the feature
+// gate was not enabled in libcore.
+
+#![stable(feature = "core", since = "1.6.0")]
+#![feature(staged_api)]
+
+enum Opt<T> {
+    Some(T),
+    None,
+}
+
+impl<T> Opt<T> {
+    #[rustc_const_unstable(feature = "foo", issue = "none")]
+    #[stable(feature = "rust1", since = "1.0.0")]
+    const fn unwrap_or_else<F: FnOnce() -> T>(self, f: F) -> T {
+    //~^ ERROR destructors cannot be evaluated at compile-time
+    //~| ERROR destructors cannot be evaluated at compile-time
+        match self {
+            Opt::Some(t) => t,
+            Opt::None => f(), //~ ERROR E0015
+        }
+    }
+}
+
+fn main() {}