patch 8.1.1816: cannot use a user defined function as a method commit https://github.com/vim/vim/commit/fcfe1a9b8950b8b211ab3b24d84b17c6847ea43f Author: Bram Moolenaar <Bram@vim.org> Date: Sun Aug 4 23:04:39 2019 +0200 patch 8.1.1816: cannot use a user defined function as a method Problem: Cannot use a user defined function as a method. Solution: Pass the base as the first argument to the user defined function after "->". (partly by FUJIWARA Takuya)

let g:loaded_foo_vim += 1

let foo#bar = {}

func foo#bar.echo()
  let g:called_foo_bar_echo += 1
endfunc

func foo#addFoo(head)
  return a:head .. 'foo'
endfunc