[Issue 13468] std.algorithm.canFind(null) fails with class

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=13468

hsteoh at quickfur.ath.cx changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Keywords|                            |wrong-code
          Component|Phobos                      |DMD

--- Comment #5 from hsteoh at quickfur.ath.cx ---
Apparently I made a total fool of myself. The *real* reason for the bug is not
a.opEquals(b), but is caused by using == to compare a class reference to an
instance of typeof(null).

Specifically, this code works:
----------
class C { }
bool fun(C e, C needle)
{
    return (e == needle);
}
void main()
{
    fun(null, null);
}
----------

But this code segfaults:
----------
class C { }
bool fun(C e, typeof(null) needle)
{
    return (e == needle);
}
void main()
{
    fun(null, null);
}
----------

The only difference is that the segfaulting case takes `typeof(null)` as
parameter. Comparing class references with null is actually OK; what's *not* OK
is comparing them with an instance of typeof(null). I think this is a compiler
bug.

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