commit https://github.com/vim/vim/commit/58adb14739fa240ca6020cede9ab1f1cb07bd90a Author: Bram Moolenaar <Bram@vim.org> Date: Sat Jan 16 21:50:51 2016 +0100 patch 7.4.1108 Problem: Expanding "~" halfway a file name. Solution: Handle the file name as one name. (Marco Hinz) Add a test. Closes https://github.com/vim/vim/issues/564.

Test for ":options".

STARTTEST
:so small.vim
:let caught = 'ok'
:try
  :options
:catch 
  :let caught = v:throwpoint . "\n" . v:exception
:endtry
:buf 1
:$put =caught
:"
:" Test that changing 'path' keeps two commas.
:set path=foo,,bar
:set path-=bar
:set path+=bar
:$put =&path
:/^result/,$w! test.out
:qa!
ENDTEST

result