[Issue 18682] std.typecons.Nullable has opEquals but no toHash

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18682

FeepingCreature <default_357-line at yahoo.de> changed:

           What    |Removed                     |Added
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                 CC|                            |default_357-line at yahoo.de

--- Comment #1 from FeepingCreature <default_357-line at yahoo.de> ---
This has become urgent with the switch to a transparent union disabling the
normal toHash generation mechanism. Fix in a bit.

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