tests/thirdparty/doctest/doctest.h is doctest 2.4.12, imported in
#4771. Two weeks later, #4801 hand-edited translateActiveException()
to declare "String res;" inside the translator loop instead of before
it, so a translator that does not match does not leave a previous
translator's result in "res" for the next iteration to see. Nothing
recorded this, so re-vendoring doctest.h from upstream would silently
drop the fix. Add a comment at the patched site naming the version,
the PR and the reason, so a future re-vendor knows to re-apply it.
Also fix two stale comments in doctest_compatibility.h:
- The DOCTEST_THREAD_LOCAL comment referenced Xcode 6/7, which is no
longer supported; reword it to explain why the define must stay
regardless (it keeps doctest's own thread_local usage out of the way
of the same Clang/MinGW crash that JSON_NO_THREAD_LOCAL works around
in the library, see ci_test_no_thread_local).
- The <iosfwd> include's comment justified it with tests that define
"private" as "public"; no test under tests/src does that any more
(removed by #2352). Reword the comment instead of dropping the
include, since confirming it is safe to drop needs the full CI
matrix including MSVC 2015+.
Verified locally that tests/src/unit-readme.cpp still builds and
passes 17/17 with these headers.
Closes#5714 item 9.
Signed-off-by: Niels Lohmann <mail@nlohmann.me>
Niels Lohmann
