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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c/85487] Support '#pragma region' and '#pragma endregion' to
 allow code folding with Visual Studio
Date: Tue, 15 Feb 2022 15:23:36 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D85487

--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jakub Jelinek from comment #4)
> Exactly.  Seems clang doesn't bother with it and allows anything, but it =
is
> unclear if that is the best thing to do.

MSVC ignores any tokens after the region/endregion as well.

> Is name and comment just a single identifier, or any sequence of any toke=
ns
> until end of line?
> And, shall the compiler verify proper nestin of these, e.g. reject
> #pragma endregion
> without earlier #pragma region, or
> #pragma region
> without termination, or whenever they aren't properly nested?

Again, other compilers don't care:
https://godbolt.org/z/zxhYaaz9Y

So it looks like this is completely ignored by the compiler, and any logic
relating to it exists only in the editor(s).=