Comment 17 for bug 1711337

That is because, as far as I understand it, this bug hasn't been resolved for any ubuntu version lower than artful (17.10), for reasons unexplained. It might be related to the release of 56.0 a day ago, so it is best to wait a few days and hopefully the fix will be backported to esr branches.

@mozilla team: do you happen to have an upstream gcc bug url, since this is a compiler bug?