patch 8.2.3016: confusing error when expression is followed by comma Commit: https://github.com/vim/vim/commit/fae55a9cb0838e4c2e634e55a3468af4a75fbdf2 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jun 17 22:08:30 2021 +0200 patch 8.2.3016: confusing error when expression is followed by comma Problem: Confusing error when expression is followed by comma. Solution: Give a different error for trailing text. (closes https://github.com/vim/vim/issues/8395)

Test for writing and reading a file of over 100 Kbyte

1 line: "This is the start"
3001 lines: "This is the leader"
1 line: "This is the middle"
3001 lines: "This is the trailer"
1 line: "This is the end"

STARTTEST
:%d
aThis is the start
This is the leader
This is the middle
This is the trailer
This is the endkY3000p2GY3000p
:w! Xtest
:%d
:e! Xtest
:.w! test.out
3003G:.w >>test.out
6005G:.w >>test.out
:qa!
ENDTEST