https://issues.dlang.org/show_bug.cgi?id=15980

          Issue ID: 15980
           Summary: std.traits.Identity is undocumented but public
           Product: D
           Version: D2
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: minor
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: joseph.wakeling@webdrake.net

The `Identity` alias defined in std.traits is publicly available (I discovered
it through a selective import in a downstream project), but not documented in
any way:
https://github.com/dlang/phobos/blob/1e9fdc08f5dac1e7cd87919bd408164dd2084370/std/traits.d#L3260

I'd happily fix the problem directly with a PR, but I'm not sure quite what the purpose of this symbol is, so reporting it here as a first step.

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