> I don't see what you mean with "breakable".
Sorry, I was confused. Until Patch 7.4.457, getchar() doesn't return
"\<CursorHold>". (However 0x80 0xFD was returned)
I meant getchar() return only when it used with <expr>.
augroup hogehoge
autocmd!
autocmd CursorHold,CursorHoldI,WinEnter * setlocal cursorline
augroup END
function! s:foo()
let c = 0
while c == "\<CursorHold>"
let c = getchar()
endwhile
echomsg c
return ''
endfunction
nnoremap <expr>f <SID>foo()
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