From 825ad381834c15ca0b98676ddec5904d2934100a Mon Sep 17 00:00:00 2001
From: Jack Stouffer <jack@jackstouffer.com>
Date: Tue, 23 May 2017 16:17:10 -0400
Subject: [PATCH] Removed auto-decoding from the single needle version of
 endsWith

---
 std/algorithm/searching.d | 21 ++++++++++++++++++---
 1 file changed, 18 insertions(+), 3 deletions(-)

diff --git a/std/algorithm/searching.d b/std/algorithm/searching.d
index 85fe4e2f5..5297fef8d 100644
--- a/std/algorithm/searching.d
+++ b/std/algorithm/searching.d
@@ -1105,9 +1105,24 @@ bool endsWith(alias pred = "a == b", R, E)(R doesThisEnd, E withThis)
 if (isBidirectionalRange!R &&
     is(typeof(binaryFun!pred(doesThisEnd.back, withThis)) : bool))
 {
-    return doesThisEnd.empty
-        ? false
-        : binaryFun!pred(doesThisEnd.back, withThis);
+    if (doesThisEnd.empty)
+        return false;
+
+    alias predFunc = binaryFun!pred;
+
+    // auto-decoding special case
+    static if (isNarrowString!R)
+    {
+        // specialize for ASCII as to not change previous behavior
+        if (withThis <= 0x7F)
+            return predFunc(doesThisEnd[$ - 1], withThis);
+        else
+            return predFunc(doesThisEnd.back, withThis);
+    }
+    else
+    {
+        return predFunc(doesThisEnd.back, withThis);
+    }
 }
 
 /// Ditto