Patch 8.2.1641
Problem:    Vim9: cannot use 0 or 1 where a bool is expected.
Solution:   Allow using 0 and 1 for a bool type. (closes #6903)
Files:      src/vim9compile.c, src/vim9type.c, src/proto/vim9type.pro,
            src/structs.h, src/testdir/test_vim9_script.vim


*** ../vim-8.2.1640/src/vim9compile.c   2020-09-08 22:45:31.109504973 +0200
--- src/vim9compile.c   2020-09-09 14:49:10.033028545 +0200
***************
*** 751,762 ****
--- 751,775 ----
  generate_PUSHNR(cctx_T *cctx, varnumber_T number)
  {
      isn_T     *isn;
+     garray_T  *stack = &cctx->ctx_type_stack;
  
      RETURN_OK_IF_SKIP(cctx);
      if ((isn = generate_instr_type(cctx, ISN_PUSHNR, &t_number)) == NULL)
        return FAIL;
      isn->isn_arg.number = number;
  
+     if (number == 0 || number == 1)
+     {
+       type_T  *type = alloc_type(cctx->ctx_type_list);
+ 
+       // A 0 or 1 number can also be used as a bool.
+       if (type != NULL)
+       {
+           type->tt_type = VAR_NUMBER;
+           type->tt_flags = TTFLAG_BOOL_OK;
+           ((type_T **)stack->ga_data)[stack->ga_len - 1] = type;
+       }
+     }
      return OK;
  }
  
*** ../vim-8.2.1640/src/vim9type.c      2020-08-30 23:24:17.219401371 +0200
--- src/vim9type.c      2020-09-09 14:42:30.966493955 +0200
***************
*** 24,30 ****
   * Allocate memory for a type_T and add the pointer to type_gap, so that it 
can
   * be freed later.
   */
!     static type_T *
  alloc_type(garray_T *type_gap)
  {
      type_T *type;
--- 24,30 ----
   * Allocate memory for a type_T and add the pointer to type_gap, so that it 
can
   * be freed later.
   */
!     type_T *
  alloc_type(garray_T *type_gap)
  {
      type_T *type;
***************
*** 359,364 ****
--- 359,368 ----
      {
        if (expected->tt_type != actual->tt_type)
        {
+           if (expected->tt_type == VAR_BOOL && actual->tt_type == VAR_NUMBER
+                                       && (actual->tt_flags & TTFLAG_BOOL_OK))
+               // Using number 0 or 1 for bool is OK.
+               return OK;
            if (give_msg)
                arg_type_mismatch(expected, actual, argidx);
            return FAIL;
*** ../vim-8.2.1640/src/proto/vim9type.pro      2020-08-30 23:24:17.219401371 
+0200
--- src/proto/vim9type.pro      2020-09-09 14:49:08.673033527 +0200
***************
*** 1,4 ****
--- 1,5 ----
  /* vim9type.c */
+ type_T *alloc_type(garray_T *type_gap);
  void clear_type_list(garray_T *gap);
  type_T *get_list_type(type_T *member_type, garray_T *type_gap);
  type_T *get_dict_type(type_T *member_type, garray_T *type_gap);
*** ../vim-8.2.1640/src/structs.h       2020-09-08 22:06:12.825040939 +0200
--- src/structs.h       2020-09-09 14:36:25.499844709 +0200
***************
*** 1373,1378 ****
--- 1373,1379 ----
  
  #define TTFLAG_VARARGS        1           // func args ends with "..."
  #define TTFLAG_OPTARG 2           // func arg type with "?"
+ #define TTFLAG_BOOL_OK        4           // can be converted to bool
  
  /*
   * Structure to hold an internal variable without a name.
*** ../vim-8.2.1640/src/testdir/test_vim9_script.vim    2020-09-06 
22:26:53.418275627 +0200
--- src/testdir/test_vim9_script.vim    2020-09-09 14:51:36.984486824 +0200
***************
*** 45,50 ****
--- 45,55 ----
    let bool2: bool = false
    assert_equal(v:false, bool2)
  
+   let bool3: bool = 0
+   assert_equal(0, bool3)
+   let bool4: bool = 1
+   assert_equal(1, bool4)
+ 
    CheckDefFailure(['let x:string'], 'E1069:')
    CheckDefFailure(['let x:string = "x"'], 'E1069:')
    CheckDefFailure(['let a:string = "x"'], 'E1069:')
*** ../vim-8.2.1640/src/version.c       2020-09-09 13:01:23.349432433 +0200
--- src/version.c       2020-09-09 14:01:01.971846204 +0200
***************
*** 756,757 ****
--- 756,759 ----
  {   /* Add new patch number below this line */
+ /**/
+     1641,
  /**/

-- 
An indication you must be a manager:
You can explain to somebody the difference between "re-engineering",
"down-sizing", "right-sizing", and "firing people's asses".

 /// Bram Moolenaar -- [email protected] -- http://www.Moolenaar.net   \\\
///        sponsor Vim, vote for features -- http://www.Vim.org/sponsor/ \\\
\\\  an exciting new programming language -- http://www.Zimbu.org        ///
 \\\            help me help AIDS victims -- http://ICCF-Holland.org    ///

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