Patch 7.4.1644
Problem:    Using string() on a partial that exists in the dictionary it binds
            results in an error. (Nikolai Pavlov)
Solution:   Make string() not fail on a recursively nested structure. (Ken
            Takta)
Files:      src/eval.c, src/testdir/test_partial.vim


*** ../vim-7.4.1643/src/eval.c  2016-03-24 19:14:31.821092318 +0100
--- src/eval.c  2016-03-24 21:11:33.132945779 +0100
***************
*** 7851,7860 ****
            break;
  
        case VAR_PARTIAL:
!           *tofree = NULL;
!           /* TODO: arguments */
!           r = tv->vval.v_partial == NULL ? NULL : tv->vval.v_partial->pt_name;
!           break;
  
        case VAR_LIST:
            if (tv->vval.v_list == NULL)
--- 7851,7900 ----
            break;
  
        case VAR_PARTIAL:
!           {
!               partial_T   *pt = tv->vval.v_partial;
!               char_u      *fname = string_quote(pt == NULL ? NULL
!                                                       : pt->pt_name, FALSE);
!               garray_T    ga;
!               int         i;
!               char_u      *tf;
! 
!               ga_init2(&ga, 1, 100);
!               ga_concat(&ga, (char_u *)"function(");
!               if (fname != NULL)
!               {
!                   ga_concat(&ga, fname);
!                   vim_free(fname);
!               }
!               if (pt != NULL && pt->pt_argc > 0)
!               {
!                   ga_concat(&ga, (char_u *)", [");
!                   for (i = 0; i < pt->pt_argc; ++i)
!                   {
!                       if (i > 0)
!                           ga_concat(&ga, (char_u *)", ");
!                       ga_concat(&ga,
!                            tv2string(&pt->pt_argv[i], &tf, numbuf, copyID));
!                       vim_free(tf);
!                   }
!                   ga_concat(&ga, (char_u *)"]");
!               }
!               if (pt != NULL && pt->pt_dict != NULL)
!               {
!                   typval_T dtv;
! 
!                   ga_concat(&ga, (char_u *)", ");
!                   dtv.v_type = VAR_DICT;
!                   dtv.vval.v_dict = pt->pt_dict;
!                   ga_concat(&ga, tv2string(&dtv, &tf, numbuf, copyID));
!                   vim_free(tf);
!               }
!               ga_concat(&ga, (char_u *)")");
! 
!               *tofree = ga.ga_data;
!               r = *tofree;
!               break;
!           }
  
        case VAR_LIST:
            if (tv->vval.v_list == NULL)
***************
*** 7941,7990 ****
        case VAR_FUNC:
            *tofree = string_quote(tv->vval.v_string, TRUE);
            return *tofree;
-       case VAR_PARTIAL:
-           {
-               partial_T   *pt = tv->vval.v_partial;
-               char_u      *fname = string_quote(pt == NULL ? NULL
-                                                       : pt->pt_name, FALSE);
-               garray_T    ga;
-               int         i;
-               char_u      *tf;
- 
-               ga_init2(&ga, 1, 100);
-               ga_concat(&ga, (char_u *)"function(");
-               if (fname != NULL)
-               {
-                   ga_concat(&ga, fname);
-                   vim_free(fname);
-               }
-               if (pt != NULL && pt->pt_argc > 0)
-               {
-                   ga_concat(&ga, (char_u *)", [");
-                   for (i = 0; i < pt->pt_argc; ++i)
-                   {
-                       if (i > 0)
-                           ga_concat(&ga, (char_u *)", ");
-                       ga_concat(&ga,
-                            tv2string(&pt->pt_argv[i], &tf, numbuf, copyID));
-                       vim_free(tf);
-                   }
-                   ga_concat(&ga, (char_u *)"]");
-               }
-               if (pt != NULL && pt->pt_dict != NULL)
-               {
-                   typval_T dtv;
- 
-                   ga_concat(&ga, (char_u *)", ");
-                   dtv.v_type = VAR_DICT;
-                   dtv.vval.v_dict = pt->pt_dict;
-                   ga_concat(&ga, tv2string(&dtv, &tf, numbuf, copyID));
-                   vim_free(tf);
-               }
-               ga_concat(&ga, (char_u *)")");
- 
-               *tofree = ga.ga_data;
-               return *tofree;
-           }
        case VAR_STRING:
            *tofree = string_quote(tv->vval.v_string, FALSE);
            return *tofree;
--- 7981,7986 ----
***************
*** 7997,8002 ****
--- 7993,7999 ----
        case VAR_NUMBER:
        case VAR_LIST:
        case VAR_DICT:
+       case VAR_PARTIAL:
        case VAR_SPECIAL:
        case VAR_JOB:
        case VAR_CHANNEL:
***************
*** 19258,19264 ****
      char_u    numbuf[NUMBUFLEN];
  
      rettv->v_type = VAR_STRING;
!     rettv->vval.v_string = tv2string(&argvars[0], &tofree, numbuf, 0);
      /* Make a copy if we have a value but it's not in allocated memory. */
      if (rettv->vval.v_string != NULL && tofree == NULL)
        rettv->vval.v_string = vim_strsave(rettv->vval.v_string);
--- 19255,19262 ----
      char_u    numbuf[NUMBUFLEN];
  
      rettv->v_type = VAR_STRING;
!     rettv->vval.v_string = tv2string(&argvars[0], &tofree, numbuf,
!                                                               get_copyID());
      /* Make a copy if we have a value but it's not in allocated memory. */
      if (rettv->vval.v_string != NULL && tofree == NULL)
        rettv->vval.v_string = vim_strsave(rettv->vval.v_string);
*** ../vim-7.4.1643/src/testdir/test_partial.vim        2016-03-22 
21:00:06.052953785 +0100
--- src/testdir/test_partial.vim        2016-03-24 21:00:17.387881966 +0100
***************
*** 180,182 ****
--- 180,195 ----
    unlet obj
    call assert_false(exists('*{' . funcnumber . '}'))
  endfunc
+ 
+ func Test_tostring()
+   let d = {}
+   let d.d = d
+   function d.test3()
+     echo 42
+   endfunction
+   try
+     call string(d.test3)
+   catch
+     call assert_true(v:false, v:exception)
+   endtry
+ endfunc
*** ../vim-7.4.1643/src/version.c       2016-03-24 19:14:31.821092318 +0100
--- src/version.c       2016-03-24 21:13:06.575986895 +0100
***************
*** 750,751 ****
--- 750,753 ----
  {   /* Add new patch number below this line */
+ /**/
+     1644,
  /**/

-- 
FIXME and XXX are two common keywords used to mark broken or incomplete code
not only since XXX as a sex reference would grab everybody's attention but
simply due to the fact that Vim would highlight these words.
                                        -- Hendrik Scholz

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