From 65fcbbf16fa37eebbfa55f68355ce741c9b55a72 Mon Sep 17 00:00:00 2001
From: Jack Stouffer <jack@jackstouffer.com>
Date: Fri, 9 Mar 2018 08:49:34 -0500
Subject: [PATCH] Improve documented example

---
 std/base64.d | 11 +++--------
 1 file changed, 3 insertions(+), 8 deletions(-)

diff --git a/std/base64.d b/std/base64.d
index 88792f107..e844bde1c 100644
--- a/std/base64.d
+++ b/std/base64.d
@@ -454,20 +454,15 @@ template Base64Impl(char Map62th, char Map63th, char Padding = '=')
     ///
     @safe pure nothrow unittest
     {
-        // @system because encode for OutputRange is @system
-        struct OutputRange
-        {
-            char[] result;
-            void put(const(char) ch) @safe { result ~= ch; }
-        }
+        import std.array : appender;
 
+        auto output = appender!string();
         ubyte[] data = [0x1a, 0x2b, 0x3c, 0x4d, 0x5d, 0x6e];
 
         // This overload of encode() returns the number of calls to the output
         // range's put method.
-        OutputRange output;
         assert(Base64.encode(data, output) == 8);
-        assert(output.result == "Gis8TV1u");
+        assert(output.data == "Gis8TV1u");
     }