From edb45421398466f73b59a9da45ea8f521adf5fcd Mon Sep 17 00:00:00 2001
From: Scott McMurray <scottmcm@users.noreply.github.com>
Date: Sun, 13 Dec 2020 21:36:21 -0800
Subject: [PATCH] Add a test using `mem::forget` in a `const fn`

---
 library/core/tests/mem.rs | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/library/core/tests/mem.rs b/library/core/tests/mem.rs
index 268c2ed283f64..54e90387b36e2 100644
--- a/library/core/tests/mem.rs
+++ b/library/core/tests/mem.rs
@@ -137,3 +137,16 @@ fn assume_init_good() {
 
     assert!(TRUE);
 }
+
+#[test]
+#[cfg(not(bootstrap))]
+fn forget_works_in_const_fn() {
+    const fn forget_arg_and_return_4(x: Vec<i32>) -> i32 {
+        std::mem::forget(x);
+        4
+    }
+
+    const FOUR_THE_HARD_WAY: i32 = forget_arg_and_return_4(Vec::new());
+
+    assert_eq!(FOUR_THE_HARD_WAY, 4);
+}