[Issue 6393] allow undefined aliases as template parameters and alias tuples

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=6393



--- Comment #1 from Gor Gyolchanyan <gor at boloneum.com> 2011-07-28 08:38:52 PDT ---
Also i would suggest to disallow passing arbitrary aliases into variadic
templates like:

template foo(Item...)
{
}

and allow only type names, because the similar non-variadic declaration:

template bar(Item)
{
}

means, that "bar" takes a single type.
to resolve the issue of variadic alias templates, a simple syntax may be used,
like:

template buzz(alias... items)
{
}

or

template buzz(alias items...)
{
}

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