Expansion statements do not handle immediate invocations correctly

[DarkArc]

The following should be valid:

enum E
{
    e1, e2
};

int main()
{
    constexpr auto m = meta::members_of( ^E );
    template for (constexpr auto x: m) { 
        char const * name = meta::name_of( x );
    }
}

However, we do not setup an immediate invocation correctly for the meta::name_of call. This results in an incorrect diagnostic.

[davrec72]

Just glancing at this vs. your old implem on gitlab, perhaps this change is responsible:
Old: https://gitlab.com/lock3/clang/-/blob/feature/reflect/clang/lib/Sema/SemaExpr.cpp#L16233
New: https://github.com/lock3/meta/blob/feature/reflect/clang/lib/Sema/SemaExpr.cpp#L16313
Note too that if you change the example to meta::name_of( ^E ) it does indeed wrap it in a ConstantExpr, judging from the dump on cppx.godbolt, so the x is the problem; presumably something to do with its dependence.
No real clue, but hope that helps, good luck!