determine parameter storage class in D 2.0

[Robert Fraser]

Christian Kamm wrote:
> Has someone figured out a reliable way to determine at compile time whether
> a function parameter is passed by reference or by copy?
> 
> The functionality (ParamsPassMethodTuple) in std.bind does not work. (It
> expects that giving a const T to a function expecting ref T will fail,
> which leads to wrong results for simple types like int.) 
> 
> Modifying it to check with enum T, invariant T or the type's initializer
> fails. I noticed that ParameterTypeTuple!(function) contains the ref/out
> etc. in the tuple, but there seems to be no way to test for it. (stringof
> aside)
> 
> Anyway, I think it's odd that for
> 
> void foo(ref int i) {}
> void foo2(ParameterTypeTuple!(foo)) {}
> 
> ParameterTypeTuple!(foo) is (ref int) and
> ParameterTypeTuple!(foo2) is (int).
> 
> Regards,
> Christian Kamm

Looks like a bug