toLower is totally broken in 2.080

[Basile B.]

On Friday, 15 June 2018 at 13:34:32 UTC, Temtaime wrote:
> On Friday, 15 June 2018 at 13:30:53 UTC, Basile B. wrote:
>> On Friday, 15 June 2018 at 12:17:03 UTC, Temtaime wrote:
>>> https://issues.dlang.org/show_bug.cgi?id=18993
>>> Please, maybe someone fix and backport it to stable
>>
>> Works for me w/ 2.081 but fails with dmd ~master.
>
> Maybe i mixed up versions, then sorry. But a bug to fix anyway.

Culprit PR is https://github.com/dlang/phobos/pull/6545.
Author notified.