patch 8.2.1502: Vim9: can use += with a :let command at script level Commit: https://github.com/vim/vim/commit/122616d9c1b57f1e1f29f1151f8e26d24df9092a Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 21 21:32:50 2020 +0200 patch 8.2.1502: Vim9: can use += with a :let command at script level Problem: Vim9: can use += with a :let command at script level. Solution: Give an error.

let encoding = &enc
if encoding == 'latin1'
    if has("unix")
	let encoding = 'iso-8859-8'
    else
	let encoding = 'cp1255'
    endif
endif

if encoding == 'utf-8'
	source <sfile>:p:h/hebrewp_utf-8.vim
elseif encoding == 'cp1255'
	source <sfile>:p:h/hebrewp_cp1255.vim
else
	source <sfile>:p:h/hebrewp_iso-8859-8.vim
endif