[Issue 18870] Link failure only with -allinst for code in isExpression

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18870

ag0aep6g <ag0aep6g at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |link-failure
                 CC|                            |ag0aep6g at gmail.com

--- Comment #1 from ag0aep6g <ag0aep6g at gmail.com> ---
Reduced:

----
void put(R)(R r)
{
    r.put();
}

enum hasToString = is(typeof({
    static struct S { void put() {} }
    enum e = is(typeof(put(S.init)));
}));

static assert(hasToString);
void main() {}
----

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