commit https://github.com/vim/vim/commit/065ee9aebf9abe08ae8c0dba7d05cbdcc423c8e0 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Jan 15 20:53:38 2016 +0100 patch 7.4.1097 Problem: Looking up the alloc ID for tests fails. Solution: Fix the line computation. Use assert_fails() for unlet test.

" Vim indent file
" Language:	Mail
" Maintainer:	Bram Moolenaar
" Last Change:	2009 Jun 03

if exists("b:did_indent")
  finish
endif
let b:did_indent = 1

" What works best is auto-indenting, disable other indenting.
" For formatting see the ftplugin.
setlocal autoindent nosmartindent nocindent indentexpr=