patch 8.0.0271: may get ml_get error when :tcldo deletes lines commit https://github.com/vim/vim/commit/a4c906a4a111cbe59cf5f1e8354a36ba83e0a444 Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 29 23:26:37 2017 +0100 patch 8.0.0271: may get ml_get error when :tcldo deletes lines Problem: May get ml_get error when :tcldo deletes lines or switches to another buffer. (Nikolai Pavlov, closes https://github.com/vim/vim/issues/1421) Solution: Check the buffer and line every time.

" Tests for the Tcl interface.

if !has('tcl')
  finish
end

function Test_tcldo()
  " Check deleting lines does not trigger ml_get error.
  new
  call setline(1, ['one', 'two', 'three'])
  tcldo ::vim::command %d_
  bwipe!

  " Check switching to another buffer does not trigger ml_get error.
  new
  let wincount = winnr('$')
  call setline(1, ['one', 'two', 'three'])
  tcldo ::vim::command new
  call assert_equal(wincount + 1, winnr('$'))
  bwipe!
  bwipe!
endfunc