[vim/vim] Vim9script: Using filter() on block-scoped variable causes script-level variable to become inaccessible in function (Issue #19959)

[Mao-Yining]

mao-yining created an issue (vim/vim#19959)

Steps to reproduce

vim9script
if true
	var lines = ['a']
	lines->filter((_, _) => true)
endif
var lines = []

def F()
	lines->add('c')
enddef
F()

Throw E1001: Variable not found: lines.

Expected behaviour

The script-level variable lines should be accessible inside function F().

Version of Vim

9.2.0329

Environment

MS-Windows GUI

Logs and stack traces

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[Mao-Yining]

mao-yining left a comment (vim/vim#19959)

Found this problem when preparing #19915

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