Patch 9.0.1355
Problem:    No error when declaring a class twice. (Ernie Rael)
Solution:   Pass different flags when declaring the class. (closes #12057)
Files:      src/vim9class.c, src/testdir/test_vim9_class.vim


*** ../vim-9.0.1354/src/vim9class.c     2023-02-21 12:38:46.827436713 +0000
--- src/vim9class.c     2023-02-25 19:50:56.601262949 +0000
***************
*** 230,236 ****
      void
  ex_class(exarg_T *eap)
  {
!     int is_class = eap->cmdidx == CMD_class;  // FALSE for :interface
  
      char_u *arg = eap->arg;
      int is_abstract = eap->cmdidx == CMD_abstract;
--- 230,237 ----
      void
  ex_class(exarg_T *eap)
  {
!     int           is_class = eap->cmdidx == CMD_class;  // FALSE for 
:interface
!     long    start_lnum = SOURCING_LNUM;
  
      char_u *arg = eap->arg;
      int is_abstract = eap->cmdidx == CMD_abstract;
***************
*** 1097,1104 ****
        tv.v_type = VAR_CLASS;
        tv.vval.v_class = cl;
        is_export = class_export;
        set_var_const(cl->class_name, current_sctx.sc_sid,
!                                            NULL, &tv, FALSE, ASSIGN_DECL, 0);
        return;
      }
  
--- 1098,1106 ----
        tv.v_type = VAR_CLASS;
        tv.vval.v_class = cl;
        is_export = class_export;
+       SOURCING_LNUM = start_lnum;
        set_var_const(cl->class_name, current_sctx.sc_sid,
!                                                      NULL, &tv, FALSE, 0, 0);
        return;
      }
  
*** ../vim-9.0.1354/src/testdir/test_vim9_class.vim     2023-02-21 
19:55:02.795958051 +0000
--- src/testdir/test_vim9_class.vim     2023-02-25 19:57:03.596589607 +0000
***************
*** 164,169 ****
--- 164,191 ----
    v9.CheckScriptSuccess(lines)
  enddef
  
+ def Test_class_defined_twice()
+   # class defined twice should fail
+   var lines =<< trim END
+       vim9script
+       class There
+       endclass
+       class There
+       endclass
+   END
+   v9.CheckScriptFailure(lines, 'E1041: Redefining script item: "There"')
+ 
+   # one class, reload same script twice is OK
+   lines =<< trim END
+       vim9script
+       class There
+       endclass
+   END
+   writefile(lines, 'XclassTwice.vim', 'D')
+   source XclassTwice.vim
+   source XclassTwice.vim
+ enddef
+ 
  def Test_class_interface_wrong_end()
    var lines =<< trim END
        vim9script
***************
*** 1012,1025 ****
          this.member: string
        endinterface
  
!       class SomeImpl implements Some, Another
          this.member = 'abc'
          static count: number
          def Method(nr: number)
            echo nr
          enddef
        endclass
- 
    END
    v9.CheckScriptSuccess(lines)
  
--- 1034,1046 ----
          this.member: string
        endinterface
  
!       class AnotherImpl implements Some, Another
          this.member = 'abc'
          static count: number
          def Method(nr: number)
            echo nr
          enddef
        endclass
    END
    v9.CheckScriptSuccess(lines)
  
*** ../vim-9.0.1354/src/version.c       2023-02-25 14:24:39.573937238 +0000
--- src/version.c       2023-02-25 19:54:54.844778300 +0000
***************
*** 697,698 ****
--- 697,700 ----
  {   /* Add new patch number below this line */
+ /**/
+     1355,
  /**/

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