Test for sourcing a file with CTRL-V's at the end of the line

STARTTEST
:/firstline/+1,/lastline/-1w! testfile
:so testfile
Gmm__1__2__3__4__5:'m,$w! test.out
:!rm -rf testfile
:qa!
ENDTEST

firstline
map __1 afirst
map __2 asecond
map __3 athird
map __4 afourth
map __5 afifth
map __1 asd
map __2 asd
map __3 asd
map __4 asd
map __5 asd
lastline