https://d.puremagic.com/issues/show_bug.cgi?id=12347

           Summary: adjoin!SingleFun does not return a tuple
           Product: D
           Version: D2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P2
         Component: Phobos
        AssignedTo: nobody@puremagic.com
        ReportedBy: monarchdodra@gmail.com


--- Comment #0 from monarchdodra@gmail.com 2014-03-11 04:26:40 PDT ---
It simply aliases to SingleFun.

While it sounds like a good idea on paper, in practice, it is actually counter-productive:

In non-generic code, no-one will use adjoin for a single function.
In generic code, it becomes counter productive, since the caller will have to
explicitly handle single arg cases, since the result can't be statically
indexed or iterated on. This *forces* the user to handle it explicitly in a
different branch.

Given the design, we might as well return a tuple: Then the user *may* handle it differently, if he so wishes, but it will still work even without special handling.

Also, it goes against documentation. The documentation states that a tuple is returned.

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Peter Alexander <peter.alexander.au@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter.alexander.au@gmail.co
                   |                            |m


--- Comment #1 from Peter Alexander <peter.alexander.au@gmail.com> 2014-03-15 11:47:59 PDT ---
Shall we close this as WONTFIX now? The pull was rejected.

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monarchdodra@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX


--- Comment #2 from monarchdodra@gmail.com 2014-03-15 15:55:27 PDT ---
(In reply to comment #1)
> Shall we close this as WONTFIX now? The pull was rejected.

Arguably, it became an ER to change it's documented behavior according to what it's actually doing. Filing that would be work though, so yes, WONTFIX.

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