https://issues.dlang.org/show_bug.cgi?id=22213

          Issue ID: 22213
           Summary: Base64: Missing `@nogc` attribute on encodeLength
           Product: D
           Version: D2
          Hardware: All
               URL: http://dlang.org/
                OS: All
            Status: NEW
          Severity: normal
          Priority: P3
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: eyal@weka.io

This causes the base64 encoding to fail to be used in a @nogc context despite having no GC

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