Summary: template instantiation depends an pragma(msg,
                    T.stringof) if __traits is used
           Product: D
           Version: D2
          Platform: Other
        OS/Version: Linux
            Status: NEW
          Severity: normal
          Priority: P2
         Component: DMD

--- Comment #0 from Tobias Pankrath <> 2011-11-17 09:41:24 
PST ---
>From a thread in d.learn:

I'm trying to learn template meta programming in D. To do this, I'm working
on a��meta state machine like Boost.MSM�

States are types and can have sub states. If they do, they need to have
an attribut 'SubStates', which should be a TypeTuble with the�
sub states.

The task at hand is: Given a State and a list of all States, create
a list of all parents of State including State itself.

This code ( ought to do this
and it works sometimes.�

You can make to interesting observations of this code:

In its current form, 'dmd test.d -unittest' will print: "
> false

But if you uncomment the first pragma() in the unittest block,
it will print�
> ()�
> true

If you change the body of ParentsDesc to�
> alias TypeTuple!() Result;
it will also print
> true

Although the static if in ParentsDesc is never true in this

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