[vim/vim] Vim9: assigning a Number to $VAR or @r is not an error at script level (PR #21364)

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h_east

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Sep 24, 2026, 1:46:18 AM (2 days ago) Sep 24

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Problem:  In Vim9 script, assigning a non-String value to an environment
          variable, a register or a String v: variable at the script
          level converts the value, while a :def function gives E1012.
Solution: Also check the type at the script level and give E1012, for
          "=", "..=" and a list assignment.  "@#" still takes a Number
          with "=".  Mention this in the list of incompatibilities in
          vim9.txt.

Add Test_assign_string_only(), which checks that these fail with E1012
both in a :def function and at the script level: "= 123", "..= 123"
and "= true" on $XSTRING_ONLY, @A and v:errmsg, "@# ..= 1" and
"[$XSTRING_ONLY, @A] = [1, 2]". It also checks that legacy :let still
converts a Number to a String for these three targets.

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

https://github.com/vim/vim/pull/21364

Commit Summary

05a86af Vim9: assigning a Number to $VAR or @r is not an error at script level

File Changes

(4 files)

Patch Links:

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Christian Brabandt

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Sep 25, 2026, 4:39:22 PM (10 hours ago) Sep 25

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chrisbra left a comment (vim/vim#21364)

thanks

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