https://issues.dlang.org/show_bug.cgi?id=22214
--- Comment #1 from FeepingCreature <default_357-line at yahoo.de> ---
Simplified:
struct S
{
    struct T
    {
    }
}
void main() {
    const S s;
    static if (__traits(compiles, { auto t = s.T; }))
    {
        auto t = s.T;
    }
}
--