Patch 8.2.0800
Problem:    Errors from failing test are unclear.
Solution:   Include text where parsing failed.
Files:      src/json.c, src/testdir/test_json.vim


*** ../vim-8.2.0799/src/json.c  2020-05-13 22:44:18.142288807 +0200
--- src/json.c  2020-05-19 22:33:06.202292033 +0200
***************
*** 20,25 ****
--- 20,27 ----
  
  static int json_encode_item(garray_T *gap, typval_T *val, int copyID, int 
options);
  
+ static char e_json_error[] = N_("E491: json decode error at '%s'");
+ 
  /*
   * Encode "val" into a JSON format string.
   * The result is added to "gap"
***************
*** 740,746 ****
                        retval = json_decode_string(reader, cur_item, *p);
                    else
                    {
!                       emsg(_(e_invarg));
                        retval = FAIL;
                    }
                    break;
--- 742,748 ----
                        retval = json_decode_string(reader, cur_item, *p);
                    else
                    {
!                       semsg(_(e_json_error), p);
                        retval = FAIL;
                    }
                    break;
***************
*** 748,754 ****
                case ',': // comma: empty item
                    if ((options & JSON_JS) == 0)
                    {
!                       emsg(_(e_invarg));
                        retval = FAIL;
                        break;
                    }
--- 750,756 ----
                case ',': // comma: empty item
                    if ((options & JSON_JS) == 0)
                    {
!                       semsg(_(e_json_error), p);
                        retval = FAIL;
                        break;
                    }
***************
*** 778,784 ****
                            }
                            if (!VIM_ISDIGIT(*sp))
                            {
!                               emsg(_(e_invarg));
                                retval = FAIL;
                                break;
                            }
--- 780,786 ----
                            }
                            if (!VIM_ISDIGIT(*sp))
                            {
!                               semsg(_(e_json_error), p);
                                retval = FAIL;
                                break;
                            }
***************
*** 809,815 ****
                                    &nr, NULL, 0, TRUE);
                            if (len == 0)
                            {
!                               emsg(_(e_invarg));
                                retval = FAIL;
                                goto theend;
                            }
--- 811,817 ----
                                    &nr, NULL, 0, TRUE);
                            if (len == 0)
                            {
!                               semsg(_(e_json_error), p);
                                retval = FAIL;
                                goto theend;
                            }
***************
*** 962,968 ****
                        retval = MAYBE;
                    else
                    {
!                       emsg(_(e_invarg));
                        retval = FAIL;
                    }
                    goto theend;
--- 964,970 ----
                        retval = MAYBE;
                    else
                    {
!                       semsg(_(e_json_error), p);
                        retval = FAIL;
                    }
                    goto theend;
***************
*** 980,986 ****
                        retval = MAYBE;
                    else
                    {
!                       emsg(_(e_invarg));
                        retval = FAIL;
                    }
                    goto theend;
--- 982,988 ----
                        retval = MAYBE;
                    else
                    {
!                       semsg(_(e_json_error), p);
                        retval = FAIL;
                    }
                    goto theend;
***************
*** 1036,1042 ****
                        retval = MAYBE;
                    else
                    {
!                       emsg(_(e_invarg));
                        retval = FAIL;
                    }
                    goto theend;
--- 1038,1044 ----
                        retval = MAYBE;
                    else
                    {
!                       semsg(_(e_json_error), p);
                        retval = FAIL;
                    }
                    goto theend;
***************
*** 1055,1061 ****
        res->v_type = VAR_SPECIAL;
        res->vval.v_number = VVAL_NONE;
      }
!     emsg(_(e_invarg));
  
  theend:
      ga_clear(&stack);
--- 1057,1063 ----
        res->v_type = VAR_SPECIAL;
        res->vval.v_number = VVAL_NONE;
      }
!     semsg(_(e_json_error), p);
  
  theend:
      ga_clear(&stack);
***************
*** 1079,1085 ****
      if (ret != OK)
      {
        if (ret == MAYBE)
!           emsg(_(e_invarg));
        return FAIL;
      }
      json_skip_white(reader);
--- 1081,1087 ----
      if (ret != OK)
      {
        if (ret == MAYBE)
!           semsg(_(e_json_error), reader->js_buf);
        return FAIL;
      }
      json_skip_white(reader);
*** ../vim-8.2.0799/src/testdir/test_json.vim   2019-08-31 21:38:17.000000000 
+0200
--- src/testdir/test_json.vim   2020-05-19 22:35:01.489763121 +0200
***************
*** 148,183 ****
    call assert_fails("call json_decode('{\"\": \"ok\", \"\": \"bad\"}')", 
'E938:')
  
    call assert_equal({'n': 1}, json_decode('{"n":1,}'))
!   call assert_fails("call json_decode(\"{'n':'1',}\")", 'E474:')
!   call assert_fails("call json_decode(\"'n'\")", 'E474:')
  
!   call assert_fails('call json_decode("\"")', "E474:")
!   call assert_fails('call json_decode("blah")', "E474:")
    call assert_fails('call json_decode("true blah")', "E488:")
!   call assert_fails('call json_decode("<foobar>")', "E474:")
    call assert_fails('call json_decode("{\"a\":1,\"a\":2}")', "E938:")
  
!   call assert_fails('call json_decode("{")', "E474:")
!   call assert_fails('call json_decode("{foobar}")', "E474:")
!   call assert_fails('call json_decode("{\"n\",")', "E474:")
!   call assert_fails('call json_decode("{\"n\":")', "E474:")
!   call assert_fails('call json_decode("{\"n\":1")', "E474:")
!   call assert_fails('call json_decode("{\"n\":1,")', "E474:")
!   call assert_fails('call json_decode("{\"n\",1}")', "E474:")
!   call assert_fails('call json_decode("{-}")', "E474:")
! 
!   call assert_fails('call json_decode("[foobar]")', "E474:")
!   call assert_fails('call json_decode("[")', "E474:")
!   call assert_fails('call json_decode("[1")', "E474:")
!   call assert_fails('call json_decode("[1,")', "E474:")
!   call assert_fails('call json_decode("[1 2]")', "E474:")
  
!   call assert_fails('call json_decode("[1,,2]")', "E474:")
  
!   call assert_fails('call json_decode("{{}:42}")', "E474:")
!   call assert_fails('call json_decode("{[]:42}")', "E474:")
  
!   call assert_fails('call json_decode("\"\\u111Z\"")', 'E474:')
    call assert_equal('[😂]', json_decode('"[\uD83D\uDE02]"'))
    call assert_equal('a😂b', json_decode('"a\uD83D\uDE02b"'))
  endfunc
--- 148,183 ----
    call assert_fails("call json_decode('{\"\": \"ok\", \"\": \"bad\"}')", 
'E938:')
  
    call assert_equal({'n': 1}, json_decode('{"n":1,}'))
!   call assert_fails("call json_decode(\"{'n':'1',}\")", 'E491:')
!   call assert_fails("call json_decode(\"'n'\")", 'E491:')
  
!   call assert_fails('call json_decode("\"")', "E491:")
!   call assert_fails('call json_decode("blah")', "E491:")
    call assert_fails('call json_decode("true blah")', "E488:")
!   call assert_fails('call json_decode("<foobar>")', "E491:")
    call assert_fails('call json_decode("{\"a\":1,\"a\":2}")', "E938:")
  
!   call assert_fails('call json_decode("{")', "E491:")
!   call assert_fails('call json_decode("{foobar}")', "E491:")
!   call assert_fails('call json_decode("{\"n\",")', "E491:")
!   call assert_fails('call json_decode("{\"n\":")', "E491:")
!   call assert_fails('call json_decode("{\"n\":1")', "E491:")
!   call assert_fails('call json_decode("{\"n\":1,")', "E491:")
!   call assert_fails('call json_decode("{\"n\",1}")', "E491:")
!   call assert_fails('call json_decode("{-}")', "E491:")
! 
!   call assert_fails('call json_decode("[foobar]")', "E491:")
!   call assert_fails('call json_decode("[")', "E491:")
!   call assert_fails('call json_decode("[1")', "E491:")
!   call assert_fails('call json_decode("[1,")', "E491:")
!   call assert_fails('call json_decode("[1 2]")', "E491:")
  
!   call assert_fails('call json_decode("[1,,2]")', "E491:")
  
!   call assert_fails('call json_decode("{{}:42}")', "E491:")
!   call assert_fails('call json_decode("{[]:42}")', "E491:")
  
!   call assert_fails('call json_decode("\"\\u111Z\"")', 'E491:')
    call assert_equal('[😂]', json_decode('"[\uD83D\uDE02]"'))
    call assert_equal('a😂b', json_decode('"a\uD83D\uDE02b"'))
  endfunc
*** ../vim-8.2.0799/src/version.c       2020-05-19 21:43:41.739172477 +0200
--- src/version.c       2020-05-19 22:26:35.416034247 +0200
***************
*** 748,749 ****
--- 748,751 ----
  {   /* Add new patch number below this line */
+ /**/
+     800,
  /**/

-- 
hundred-and-one symptoms of being an internet addict:
140. You'd rather catch a score on the web than watch the game as
     it is being played on tv.

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
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\\\  an exciting new programming language -- http://www.Zimbu.org        ///
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