patch 8.2.2173: Vim9: get internal error when assigning to undefined variable Commit: https://github.com/vim/vim/commit/52c124d3303d3cc3e4504708881906d17d6d6c55 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Dec 20 21:43:35 2020 +0100 patch 8.2.2173: Vim9: get internal error when assigning to undefined variable Problem: Vim9: get internal error when assigning to undefined variable. Solution: Add error message. (closes https://github.com/vim/vim/issues/7475)

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