[Issue 14406] GIT HEAD ignores forward reference and generates wrong code

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=14406

--- Comment #2 from Kenji Hara <k.hara.pg at gmail.com> ---
This is an accepts-invalid bug. Slightly reduced:

class Foo {}

string str_mixin(T)()
{
    static if (T.tupleof.length) {}   // Fix instance size of T (== Frop)

    return "Bar bar_obj; static class Bar {  Foo foo; }";
}

class Frop
{
    mixin(str_mixin!(typeof(this)));  // adding more field after Frop fields
fixed.
}

void main()
{
    Frop simple = new Frop;
}

In str_mixin() function, testing Frop.tupleof fix the class fields and instance
size. Therefore adding one more field `bar_obj` should be rejected because it
will change the Frop instance size.

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