patch 8.2.3271: Vim9: cannot use :command or :au with block in :def function Commit: https://github.com/vim/vim/commit/e4db17fb6e2d029aa2dddfca703ace9bcf0d85fd Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 1 21:19:43 2021 +0200 patch 8.2.3271: Vim9: cannot use :command or :au with block in :def function Problem: Vim9: cannot use :command or :au with a block in a :def function. Solution: Recognize the start of the block.

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