[Issue 19057] 2.079 changelog variadic template and default arguments

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19057

--- Comment #3 from Steven Schveighoffer <schveiguy at yahoo.com> ---
So the use case for the new style is pretty well discussed and documented (and
makes a lot of sense). The use cases for the old style are not discussed
really.

Looks like the only times default parameters were used is when the number of
parameters was less than the default (then the variadic template was inferred
as an empty list). I can potentially see the benefit there.

Can that functionality be duplicated with the new mechanism? That is the main
question we have to answer. If it can, then the deprecation period can be
relatively short, with a nice message on how to rewrite. If not, then I don't
know what the right path is. Clearly it's a hugely useful thing to be able to
specify default parameters for line and file without doing it in the template
list.

Johan, do you have some sample code to show a good use case for the old way?

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