Patch 8.2.4548
Problem:    Script-local function is deleted when used in a funcref.
Solution:   Do not consider a function starting with "<SNR>" reference
            counted. (closes #9916, closes #9820)
Files:      src/userfunc.c, src/testdir/test_vim9_func.vim


*** ../vim-8.2.4547/src/userfunc.c      2022-03-08 19:43:51.688198945 +0000
--- src/userfunc.c      2022-03-11 18:51:17.221099302 +0000
***************
*** 2215,2222 ****
  
  /*
   * There are two kinds of function names:
!  * 1. ordinary names, function defined with :function or :def
!  * 2. numbered functions and lambdas
   * For the first we only count the name stored in func_hashtab as a reference,
   * using function() does not count as a reference, because the function is
   * looked up by name.
--- 2215,2223 ----
  
  /*
   * There are two kinds of function names:
!  * 1. ordinary names, function defined with :function or :def;
!  *    can start with "<SNR>123_" literally or with K_SPECIAL.
!  * 2. Numbered functions and lambdas: "<lambda>123"
   * For the first we only count the name stored in func_hashtab as a reference,
   * using function() does not count as a reference, because the function is
   * looked up by name.
***************
*** 2224,2230 ****
      int
  func_name_refcount(char_u *name)
  {
!     return numbered_function(name) || *name == '<';
  }
  
  /*
--- 2225,2231 ----
      int
  func_name_refcount(char_u *name)
  {
!     return numbered_function(name) || (name[0] == '<' && name[1] == 'l');
  }
  
  /*
*** ../vim-8.2.4547/src/testdir/test_vim9_func.vim      2022-03-08 
19:43:51.692198946 +0000
--- src/testdir/test_vim9_func.vim      2022-03-11 18:50:26.253226566 +0000
***************
*** 3717,3722 ****
--- 3717,3740 ----
    v9.CheckScriptSuccess(lines)
  enddef
  
+ def Test_script_local_other_script()
+   var lines =<< trim END
+       function LegacyJob()
+         let FuncRef = function('s:close_cb')
+       endfunction
+       function s:close_cb(...)
+       endfunction
+   END
+   lines->writefile('Xlegacy.vim')
+   source Xlegacy.vim
+   g:LegacyJob()
+   g:LegacyJob()
+   g:LegacyJob()
+ 
+   delfunc g:LegacyJob
+   delete('Xlegacy.vim')
+ enddef
+ 
  def Test_check_func_arg_types()
    var lines =<< trim END
        vim9script
*** ../vim-8.2.4547/src/version.c       2022-03-11 16:01:22.309619180 +0000
--- src/version.c       2022-03-11 18:22:31.883774292 +0000
***************
*** 752,753 ****
--- 752,755 ----
  {   /* Add new patch number below this line */
+ /**/
+     4548,
  /**/

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