[vim/vim] Vim9script variable duplication check is too strict. (Issue #20240)

[BenYip]

bennyyip created an issue (vim/vim#20240)

Steps to reproduce

1. save this script to a file

vim9script

class Foo
  var bar: number
  var _bar: number
endclass

2. :soure %

error:

line    5:
E1369: Duplicate variable: _bar

Expected behaviour

_bar and bar is not duplicate.

Version of Vim

9.2.0498

Environment

doesn't matter

Logs and stack traces

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[h_east]

h-east left a comment (vim/vim#20240)

It might not be immediately obvious, but there is an explanation in the help files.

:h E1369

							*E1355* *E1369*
(snip...)
It is not possible to use a public and protected member variable with the same name.

For protected member variable, See :h protected-variable.

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[BenYip]

bennyyip left a comment (vim/vim#20240)

Thanks. I don't know there is protected member.
I think the error message can be improved, like "E1369: Duplicate protected and public member: _bar and bar".

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