patch 8.2.2719: Vim9: appending to dict item doesn't work in a :def function Commit: https://github.com/vim/vim/commit/e42939af87be3adad8c08ceb454e3a31114d7165 Author: Bram Moolenaar <Bram@vim.org> Date: Mon Apr 5 17:11:17 2021 +0200 patch 8.2.2719: Vim9: appending to dict item doesn't work in a :def function Problem: Vim9: appending to dict item doesn't work in a :def function. Solution: Implement assignment with operator on indexed item.

Tests for complicated + argument to :edit command

STARTTEST
:$-1w! Xfile1
:$w! Xfile2
:edit +1|s/|/PIPE/|w Xfile1| e Xfile2|1 | s/\//SLASH/|w
:w! test.out
:e Xfile1
:w >> test.out
:qa!
ENDTEST

The result should be in Xfile1: "fooPIPEbar", in Xfile2: "fooSLASHbar"
foo|bar
foo/bar