LLVM generates an undefined instruction for this test

[eholk]

fn start() {
}

fn main() {
    child = spawn start();
    auto child;
}

[eholk]

This exposes the same issue:

fn main() {
    p = port[int]();
    auto p;
}

[eholk]

This is probably about the simplest version of the same issue:

fn main() {
    x = @true;
    auto x;
}

[brson]

Recent scoping changes seem to make it not possible to use before declaration.