[Issue 15985] [REG2.068/2.069] Code doesn't link unless compiled with -debug

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15985

ag0aep6g at gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |ag0aep6g at gmail.com

--- Comment #4 from ag0aep6g at gmail.com ---
Reduced further:

----
void f()() { h!()(); }
void g()() { f!()(); }
void h()() { g!()(); }

enum x = is(typeof(g!()()));
alias my_h = h!();

void main() {}
----

And here's a variant that fails both with and without -debug:

----
void f()()
{
    g!()();
    h!()();
}

void g()() { f!()(); }
void h()() { f!()(); }

enum x = is(typeof(f!()()));
alias my_g = g!();

void main() {}
----

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