From 431968df376ae24347872ba3986c4c3efd29d41e Mon Sep 17 00:00:00 2001
From: Konrad Borowski <konrad@borowski.pw>
Date: Wed, 5 Dec 2018 16:42:20 +0100
Subject: [PATCH] Copy may_have_side_effect from I for Copied<I>

---
 src/libcore/iter/mod.rs | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/libcore/iter/mod.rs b/src/libcore/iter/mod.rs
index 44fe16a25088..be09182c01aa 100644
--- a/src/libcore/iter/mod.rs
+++ b/src/libcore/iter/mod.rs
@@ -590,7 +590,9 @@ unsafe impl<'a, I, T: 'a> TrustedRandomAccess for Copied<I>
     }
 
     #[inline]
-    fn may_have_side_effect() -> bool { false }
+    fn may_have_side_effect() -> bool {
+        I::may_have_side_effect()
+    }
 }
 
 #[unstable(feature = "iter_copied", issue = "0")]