[vim/vim] runtime(c): support 0O/0o octal prefix (C29) (PR #21327)

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Eisuke Kawashima

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Sep 16, 2026, 5:35:28 PM (3 days ago) Sep 16
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You can view, comment on, or merge this pull request online at:

  https://github.com/vim/vim/pull/21327

Commit Summary

  • ae09846 runtime(c): support 0O/0o octal prefix (C29)

File Changes

(4 files)

Patch Links:


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Christian Brabandt

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Sep 17, 2026, 3:52:24 PM (2 days ago) Sep 17
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chrisbra left a comment (vim/vim#21327)

Thanks, but is C29 already a thing? I thought this is still a draft?


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Eisuke Kawashima

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Sep 18, 2026, 7:26:31 PM (10 hours ago) Sep 18
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e-kwsm left a comment (vim/vim#21327)

Yes, C2Y (C29) is literally scheduled to be released in 2029, but the feature is already supported by GCC 15.2 and Clang 21.1.0 as C2Y extension.

C29 will deprecated old octal notation w/o 0o, e.g. 0123, but I do not highlight it as error since it is too early.


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