vim-patch:8.2.3416: second error is reported while exception is being thrown

Problem:    Second error is reported while exception is being thrown.
Solution:   Do not check for trailing characters when already aborting.
            (closes vim/vim#8842)
36f691f5f1

src/nvim/eval/userfunc.c

@@ -3018,7 +3018,7 @@ void ex_call(exarg_T *eap)
   }
 
   // When inside :try we need to check for following "| catch".
-  if (!failed || eap->cstack->cs_trylevel > 0) {
+  if (!aborting() && (!failed || eap->cstack->cs_trylevel > 0)) {
     // Check for trailing illegal characters and a following command.
     if (!ends_excmd(*arg)) {
       if (!failed) {

src/nvim/testdir/test_trycatch.vim

@@ -1996,5 +1996,29 @@ func Test_reload_in_try_catch()
   call delete('Xreload')
 endfunc
 
+" Test for using throw in a called function with following error    {{{1
+func Test_user_command_throw_in_function_call()
+  let lines =<< trim END
+      function s:get_dict() abort
+        throw 'my_error'
+      endfunction
+
+      try
+        call s:get_dict().foo()
+      catch /my_error/
+        let caught = 'yes'
+      catch
+        let caught = 'no'
+      endtry
+      call assert_equal('yes', caught)
+  END
+  call writefile(lines, 'XtestThrow')
+  source XtestThrow
+
+  call delete('XtestThrow')
+  unlet g:caught
+endfunc
+
+
 " Modeline								    {{{1
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker