1 files changed, 24 insertions, 0 deletions
diff --git a/tests/ui/consts/const-eval/dont_promote_unstable_const_fn.rs b/tests/ui/consts/const-eval/dont_promote_unstable_const_fn.rs
new file mode 100644
index 000000000..4b3cf7073
--- /dev/null
+++ b/tests/ui/consts/const-eval/dont_promote_unstable_const_fn.rs
@@ -0,0 +1,24 @@
+#![unstable(feature = "humans",
+            reason = "who ever let humans program computers,
+            we're apparently really bad at it",
+            issue = "none")]
+
+#![feature(staged_api)]
+
+#[stable(feature = "rust1", since = "1.0.0")]
+#[rustc_const_unstable(feature="foo", issue = "none")]
+const fn foo() -> u32 { 42 }
+
+fn meh() -> u32 { 42 }
+
+const fn bar() -> u32 { foo() } //~ ERROR `foo` is not yet stable as a const fn
+
+fn a() {
+    let _: &'static u32 = &foo(); //~ ERROR temporary value dropped while borrowed
+}
+
+fn main() {
+    let _: &'static u32 = &meh(); //~ ERROR temporary value dropped while borrowed
+    let x: &'static _ = &std::time::Duration::from_millis(42).subsec_millis();
+    //~^ ERROR temporary value dropped while borrowed
+}