patch 8.2.1590: Vim9: bufnr() doesn't take "true" argument Commit: https://github.com/vim/vim/commit/fe136c9a85412f4bdb5de70ef8416af5fa382b28 Author: Bram Moolenaar <Bram@vim.org> Date: Fri Sep 4 18:35:26 2020 +0200 patch 8.2.1590: Vim9: bufnr() doesn't take "true" argument Problem: Vim9: bufnr() doesn't take "true" argument. Solution: use tv_get_bool_chk(). (closes https://github.com/vim/vim/issues/6863)

--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1327,6 +1327,10 @@ enddef
 def Test_bufnr()
   let buf = bufnr()
   assert_equal(buf, bufnr('%'))
+
+  buf = bufnr('Xdummy', true)
+  assert_notequal(-1, buf)
+  exe 'bwipe! ' .. buf
 enddef
 
 def Test_col()