I was trying to write a function has different behavior depending on whether it is called from @nogc code or not. However, I am noticing that this does not seem possible because of the timing of attribute inference.

If I call getFunctionAttributes within foo below, then it is system but then when called from main they are correctly inferred. It is as if the attribute inference happens after the getFunctionAttributes is called.

Is there any way to get the correct function attributes within a template function?

auto foo(T)(T x) {
    pragma(msg, __traits(getFunctionAttributes, foo!T));
    pragma(msg, __traits(getFunctionAttributes, foo!int));
    return x;
}

void main() {
    auto x = foo(1);
    pragma(msg, __traits(getFunctionAttributes, foo!int));
}