patch 8.0.1249: no error when WaitFor() gets an invalid wrong expression commit https://github.com/vim/vim/commit/c20e0d52071a3f6e12321ec3344024faa4695da9 Author: Bram Moolenaar <Bram@vim.org> Date: Thu Nov 2 18:19:19 2017 +0100 patch 8.0.1249: no error when WaitFor() gets an invalid wrong expression Problem: No error when WaitFor() gets an invalid wrong expression. Solution: Do not ignore errors in evaluationg the expression. Fix places where the expression was wrong.

"Test for benchmarking the RE engine

so small.vim
if !has("reltime") | finish | endif
func! Measure(file, pattern, arg)
	for re in range(3)
	    let sstart=reltime()
	    let cmd=printf("../vim -u NONE -N --cmd ':set re=%d'".
		\ " -c 'call search(\"%s\", \"\", \"\", 10000)' -c ':q!' %s", re, escape(a:pattern, '\\'), empty(a:arg) ? '' : a:arg)
	    call system(cmd. ' '. a:file)
	    $put =printf('file: %s, re: %d, time: %s', a:file, re, reltimestr(reltime(sstart)))
	endfor
endfunc