[Webkit-unassigned] [Bug 143303] Value assignment operator of Optional should be stricter

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=143303

--- Comment #5 from Antti Koivisto <koivisto at iki.fi> ---
I don't think something like this requires a test. There are no functional changes. Code like http://trac.webkit.org/changeset/182271 just doesn't compile without this.

Note that Optional is simply our version of std::optional which is likely to be in C++17.

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