[Issue 9980] [CTFE] Allow interpreting function with variable arguments when their values aren't used

[d-bugmail at puremagic.com]

http://d.puremagic.com/issues/show_bug.cgi?id=9980



--- Comment #1 from Denis Shelomovskij <verylonglogin.reg at gmail.com> 2013-04-23 13:59:21 MSD ---
E.g. this will allow such `isLvalue` library implementation:
---
bool isLvalue(T)(auto ref T t)
{ return __traits(isRef, t); }


void main()
{
    int i;
    static assert( isLvalue(i));
    static assert(!isLvalue(i + 1));
}
---

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