patch 8.2.1977: Vim9: error for using a string in a condition is confusing Commit: https://github.com/vim/vim/commit/ea2d407f9c144bb634c59017944e4930ed7f80a2 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 12 12:08:51 2020 +0100 patch 8.2.1977: Vim9: error for using a string in a condition is confusing Problem: Vim9: error for using a string in a condition is confusing. Solution: Give a more specific error. Also adjust the compile time type checking for || and &&.

" Script to fill the window with emoji characters, one per line.
" Source this script: :source %

if &modified
  new
else
  enew
endif

" Use a compiled Vim9 function for speed
def DoIt()
  let lnum = 1
  for c in range(0x100, 0x1ffff)
    let cs = nr2char(c)
    if charclass(cs) == 3
      setline(lnum, '|' .. cs .. '| ' .. strwidth(cs))
      lnum += 1
    endif
  endfor
enddef

call DoIt()
set nomodified