commit https://github.com/vim/vim/commit/c4bfedabe057c05f09a455a5851089e177fa9c00 Author: Bram Moolenaar <Bram@vim.org> Date: Wed Dec 14 21:42:00 2016 +0100 patch 8.0.0134 Problem: Null pointer access reported by UBsan. Solution: Check curwin->w_buffer is not NULL. (Yegappan Lakshmanan)

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