Patch 8.2.1134
Problem:    Vim9: getting a list member may not work.
Solution:   Clear the list only after copying the item. (closes #6393)
Files:      src/vim9execute.c, src/testdir/test_vim9_expr.vim


*** ../vim-8.2.1133/src/vim9execute.c   2020-07-04 19:19:40.000062220 +0200
--- src/vim9execute.c   2020-07-05 16:36:51.765492773 +0200
***************
*** 2085,2090 ****
--- 2085,2091 ----
                    list_T      *list;
                    varnumber_T n;
                    listitem_T  *li;
+                   typval_T    temp_tv;
  
                    // list index: list is at stack-2, index at stack-1
                    tv = STACK_TV_BOT(-2);
***************
*** 2109,2116 ****
                        goto failed;
                    }
                    --ectx.ec_stack.ga_len;
!                   clear_tv(STACK_TV_BOT(-1));
!                   copy_tv(&li->li_tv, STACK_TV_BOT(-1));
                }
                break;
  
--- 2110,2121 ----
                        goto failed;
                    }
                    --ectx.ec_stack.ga_len;
!                   // Clear the list after getting the item, to avoid that it
!                   // make the item invalid.
!                   tv = STACK_TV_BOT(-1);
!                   temp_tv = *tv;
!                   copy_tv(&li->li_tv, tv);
!                   clear_tv(&temp_tv);
                }
                break;
  
*** ../vim-8.2.1133/src/testdir/test_vim9_expr.vim      2020-07-04 
19:19:40.000062220 +0200
--- src/testdir/test_vim9_expr.vim      2020-07-05 16:36:18.093586249 +0200
***************
*** 1141,1146 ****
--- 1141,1151 ----
    call CheckDefExecFailure(["let d: dict<number>", "d = g:list_empty"], 
'E1029: Expected dict but got list')
  enddef
  
+ def Test_expr_index()
+   # getting the one member should clear the list only after getting the item
+   assert_equal('bbb', ['aaa', 'bbb', 'ccc'][1])
+ enddef
+ 
  def Test_expr_member_vim9script()
    let lines =<< trim END
        vim9script
*** ../vim-8.2.1133/src/version.c       2020-07-05 16:07:18.605112076 +0200
--- src/version.c       2020-07-05 16:41:48.052330851 +0200
***************
*** 756,757 ****
--- 756,759 ----
  {   /* Add new patch number below this line */
+ /**/
+     1134,
  /**/

-- 
Never under any circumstances take a sleeping pill
and a laxative on the same night.

 /// 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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