[Issue 18135] [REG2.078] can't join RegexMatch anymore

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18135

--- Comment #1 from Seb <greensunny12 at gmail.com> ---
This was introduced by https://github.com/dlang/phobos/pull/4286

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