[Issue 22785] joiner does not support range over immutable

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=22785

FeepingCreature <default_357-line at yahoo.de> changed:

           What    |Removed                     |Added
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           Keywords|                            |industry

--- Comment #1 from FeepingCreature <default_357-line at yahoo.de> ---
Ran into it again just now. Bleh.

This is also one of the issues that need
https://github.com/dlang/phobos/pull/8674

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