commit https://github.com/vim/vim/commit/8def26a0f5f5535e9af64e715cb80845fc8ec322 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Dec 17 15:34:53 2015 +0100 patch 7.4.976 Problem: When compiling Vim for MSYS2 (linked with msys-2.0.dll), the Win32 clipboard is not enabled. Solution: Recognize MSYS like CYGWIN. (Ken Takata)

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