Update index.dd

Author: Imperatorn

index.dd

@@ -239,7 +239,8 @@ void main()
     {
         static foreach (c; "+-*/")
             if (sym == [c])
-                return mixin("arr[0 .. $-2] ~ (arr[$-2] " ~ c ~ " arr[$-1])");
+                return mixin("arr[0 .. $-2] ~ 
+                    (arr[$-2] " ~ c ~ " arr[$-1])");
 
         return arr ~ sym.to!real;
     })((real[]).init).writeln;