patch 8.2.2760: Vim9: no error for changing a for loop variable Commit: https://github.com/vim/vim/commit/f6a8d420a8d2924737f713de046947dcb487550c Author: Bram Moolenaar <Bram@vim.org> Date: Tue Apr 13 21:48:03 2021 +0200 patch 8.2.2760: Vim9: no error for changing a for loop variable Problem: Vim9: no error for changing a for loop variable. Solution: Make the loop variable read-only. (issue https://github.com/vim/vim/issues/8102)

Tests for file with some lines ending in CTRL-M, some not

STARTTEST
:set ta tx
:e!
:$-3,$w! test.out
:qa!
ENDTEST

this lines ends in a
this one doesn't
this one does
and the last one doesn't