[Issue 15231] opOpAssign allows assignment to rvalue

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=15231

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> ---
https://run.dlang.io/is/pqAj9b

Just ran into this. Annoying! Not caught by @safe or -dip1000 either.

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