commit https://github.com/vim/vim/commit/46643713dc6bb04b4e84986b1763ef309e960161 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Sep 9 21:42:36 2016 +0200 patch 7.4.2357 Problem: Attempt to read history entry while not initialized. Solution: Skip when the index is negative.

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