https://issues.dlang.org/show_bug.cgi?id=18657
--- Comment #2 from Dlang Bot <dlang-bot@dlang.rocks> --- @aG0aep6G updated dlang/phobos pull request #6346 "make `group`, `chain`, and `choose` compatible with `RefRange`" mentioning this issue: - make `chain` compatible with `RefRange` Part of a series on issue 18657. - make `group` compatible with `RefRange` Part of a series on issue 18657. - make `choose` compatible with `RefRange` Part of a series on issue 18657. https://github.com/dlang/phobos/pull/6346 --