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            <b><a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED - invalid code generation with -O2 for method returning ref"
   href="http://bugzilla.gdcproject.org/show_bug.cgi?id=179#c7">Comment # 7</a>
              on <a class="bz_bug_link 
          bz_status_ASSIGNED "
   title="ASSIGNED - invalid code generation with -O2 for method returning ref"
   href="http://bugzilla.gdcproject.org/show_bug.cgi?id=179">bug 179</a>
              from <span class="vcard"><a class="email" href="mailto:ibuclaw@gdcproject.org" title="Iain Buclaw <ibuclaw@gdcproject.org>"> <span class="fn">Iain Buclaw</span></a>
</span></b>
        <pre>There seems to be a key thing happening here:

---
struct SignalImpl
{
    @disable this(this);  // SignalImpl is now non-POD
}
---

Because of this, TypeFunction::toCtype sets TREE_ADDRESSABLE on functions
returning SignalImpl (which is correct behaviour, we do *not* want non-POD
types to return in registers).

However...
---
ref RestrictedSignal valueChanged()
{
    return valueChangedSg.mRestricted;  // returned by ref
}
---

Reference returns should not have TREE_ADDRESSABLE set as they are already
returning in memory.</pre>
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