[Issue 19799] templated string formatting fails with const Nullable!string

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19799

Dlang Bot <dlang-bot at dlang.rocks> changed:

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--- Comment #1 from Dlang Bot <dlang-bot at dlang.rocks> ---
@FeepingCreature created dlang/phobos pull request #6954 "Fix issue 19799: add
const toString to Nullable" fixing this issue:

- Fix issue 19799: add const toString to Nullable to avoid miscompilation in
Nullable!string due to attempted implicit .get conversion to string

https://github.com/dlang/phobos/pull/6954

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