patch 8.1.0743: giving error messages is not flexible commit https://github.com/vim/vim/commit/f9e3e09fdc93be9f0d47afbc6c7df1188c2a5a0d Author: Bram Moolenaar <Bram@vim.org> Date: Sun Jan 13 23:38:42 2019 +0100 patch 8.1.0743: giving error messages is not flexible Problem: Giving error messages is not flexible. Solution: Add semsg(). Change argument from "char_u *" to "char *", also for msg() and get rid of most MSG macros. (Ozaki Kiichi, closes #3302) Also make emsg() accept a "char *" argument. Get rid of an enormous number of type casts.

" Tests for using Ctrl-A/Ctrl-X using DBCS.
if !has('multi_byte')
  finish
endif
set encoding=cp932
scriptencoding cp932

func SetUp()
  new
  set nrformats&
endfunc

func TearDown()
  bwipe!
endfunc

func Test_increment_dbcs_1()
  set nrformats+=alpha
  call setline(1, ["ŽR1"])
  exec "norm! 0\<C-A>"
  call assert_equal(["ŽR2"], getline(1, '$'))
  call assert_equal([0, 1, 3, 0], getpos('.'))

  call setline(1, ["‚`‚a‚b0xDE‚e"])
  exec "norm! 0\<C-X>"
  call assert_equal(["‚`‚a‚b0xDD‚e"], getline(1, '$'))
  call assert_equal([0, 1, 10, 0], getpos('.'))
endfunc

" vim: shiftwidth=2 sts=2 expandtab