vim-patch:8.1.1660: assert_fails() inside try/catch #10472

Problem:    Assert_fails() does not fail inside try/catch.
Solution:   Set trylevel to zero. (Ozaki Kiichi, closes vim/vim#4639)
https://github.com/vim/vim/commit/7780e5c1c5485a979ab6e3914a43e17912e213a8

1 files changed, 5 insertions, 0 deletions

diff --git a/src/nvim/eval.c b/src/nvim/eval.c
index 8edff558e1..a1cb79d77d 100644
--- a/src/nvim/eval.c
+++ b/src/nvim/eval.c
@@ -7097,10 +7097,14 @@ static void f_assert_fails(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 {
   const char *const cmd = tv_get_string_chk(&argvars[0]);
   garray_T    ga;
+  int         save_trylevel = trylevel;
 
+  // trylevel must be zero for a ":throw" command to be considered failed
+  trylevel = 0;
   called_emsg = false;
   suppress_errthrow = true;
   emsg_silent = true;
+
   do_cmdline_cmd(cmd);
   if (!called_emsg) {
     prepare_assert_error(&ga);
@@ -7122,6 +7126,7 @@ static void f_assert_fails(typval_T *argvars, typval_T *rettv, FunPtr fptr)
     }
   }
 
+  trylevel = save_trylevel;
   called_emsg = false;
   suppress_errthrow = false;
   emsg_silent = false;