[Issue 19003] format!"" breaks with structs containing invariants violated in .init

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19003

--- Comment #2 from github-bugzilla at puremagic.com ---
Commits pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/65ca2aef50e588a7c09ef4e88d0bbc4391d80293
Add unittest for issue #19003

https://github.com/dlang/phobos/commit/43becea1e70ba4fc2a823159b48daa709f1423df
Merge pull request #6594 from
FeepingCreature/fix/Issue-19003-dont-call-tostring-on-type-init

Fix issue 19003: don't call toString on T.init
merged-on-behalf-of: Sebastian Wilzbach <sebi.wilzbach at gmail.com>

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