[vim/vim] Vim9: :def in legacy script can create a script variable (PR #21379)

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h_east

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Sep 27, 2026, 6:13:53 AM (yesterday) Sep 27

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Problem:  A :def function in a legacy script can create a script-local
          variable by assigning to it, while declaring one with "var"
          gives E1101.
Solution: Give E1089 for assigning to an unknown script-local variable
          in any :def function, not only in one defined in a Vim9
          script.  Remove uf_script_ctx_version, which was only used
          for this check.

fixes: #21378

Test_unlet() created s:somevar this way, define it at the script level instead. Test_using_s_var_in_function() checks that assigning to s:scriptlevel in a :def function of a legacy script gives E1089 when the variable does not exist.

You can view, comment on, or merge this pull request online at:

https://github.com/vim/vim/pull/21379

Commit Summary

4ab8a52 Vim9: :def in legacy script can create a script variable

File Changes

(6 files)

Patch Links:

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Christian Brabandt

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3:15 PM (7 hours ago) 3:15 PM

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chrisbra left a comment (vim/vim#21379)

thanks

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