[Issue 18778] std.format: Positional arguments do not work as expected with nesting

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18778

--- Comment #1 from github-bugzilla at puremagic.com ---
Commits pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/7ec06c07dbc3060a9f10c2b04165fc4db0ae9a21
Fix issue 18778

https://github.com/dlang/phobos/commit/7e351e17fab4186913802256479f2070b57c6285
Merge pull request #6464 from Hackerpilot/issue-18778

Fix issue 18778

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