[Issue 7879] format of class with not const toString()

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=7879

--- Comment #5 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/phobos

https://github.com/dlang/phobos/commit/502aed8cc34ee5a5c229bc12571365ab1f04e175
Fix Issue 7879 - format of const/immutable/shared class with no toString()

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