commit https://github.com/vim/vim/commit/8dd3a43d75550e9b5736066124c97697564f769e Author: Bram Moolenaar <Bram@vim.org> Date: Mon Aug 1 20:46:25 2016 +0200 patch 7.4.2142 Problem: Leaking memory when redefining a function. Solution: Don't increment the function reference count when it's found by name. Don't remove the wrong function from the hashtab. More reference counting fixes.

func Test_empty_buffer()
  new
  insert
a
b
c
d
.
  call assert_equal(1, line("''"))
  bwipe!
endfunc