commit https://github.com/vim/vim/commit/7ab6defcafe017a3ad58580a3e56dab705b1ed8b Author: Bram Moolenaar <Bram@vim.org> Date: Fri Aug 5 22:51:13 2016 +0200 patch 7.4.2161 Problem: Expression test fails without conceal feature. Solution: Only check "conceal" with the conceal feature.

Tests for file with some lines ending in CTRL-M, some not

STARTTEST
:set ta tx
:e!
:$-3,$w! test.out
:qa!
ENDTEST

this lines ends in a
this one doesn't
this one does
and the last one doesn't