To: vim_dev@googlegroups.com
Subject: Patch 9.0.1265
Fcc: outbox
From: Bram Moolenaar <Bram@moolenaar.net>
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------------

Patch 9.0.1265
Problem:    Using an interface method may give a compilation error.
Solution:   Do not try to compile the body of a method of an interface.
            (closes #11885)
Files:      src/vim9compile.c, src/testdir/test_vim9_class.vim


*** ../vim-9.0.1264/src/vim9compile.c	2023-01-26 11:58:39.606071598 +0000
--- src/vim9compile.c	2023-01-30 19:45:29.004751867 +0000
***************
*** 3181,3186 ****
--- 3181,3196 ----
      }
      ufunc->uf_args_visible = ufunc->uf_args.ga_len;
  
+     // Compiling a function in an interface is done to get the function type.
+     // No code is actually compiled.
+     if (ufunc->uf_class != NULL
+ 			   && (ufunc->uf_class->class_flags & CLASS_INTERFACE))
+     {
+ 	ufunc->uf_def_status = UF_NOT_COMPILED;
+ 	ret = OK;
+ 	goto erret;
+     }
+ 
      /*
       * Loop over all the lines of the function and generate instructions.
       */
***************
*** 3705,3711 ****
  	    iemsg("Type stack underflow");
  	    goto erret;
  	}
!     }
  
      if (cctx.ctx_scope != NULL)
      {
--- 3715,3721 ----
  	    iemsg("Type stack underflow");
  	    goto erret;
  	}
!     } // END of the loop over all the function body lines.
  
      if (cctx.ctx_scope != NULL)
      {
*** ../vim-9.0.1264/src/testdir/test_vim9_class.vim	2023-01-28 19:18:56.737720609 +0000
--- src/testdir/test_vim9_class.vim	2023-01-30 19:47:09.340691197 +0000
***************
*** 1049,1054 ****
--- 1049,1071 ----
      unlet g:result
    END
    v9.CheckScriptSuccess(lines)
+ 
+   # No class that implements the interface.
+   lines =<< trim END
+       vim9script
+ 
+       interface IWithEE
+           def Enter(): any
+           def Exit(): void
+       endinterface
+ 
+       def With1(ee: IWithEE, F: func)
+           var r = ee.Enter()
+       enddef
+ 
+       defcompile
+   END
+   v9.CheckScriptSuccess(lines)
  enddef
  
  def Test_class_used_as_type()
*** ../vim-9.0.1264/src/version.c	2023-01-30 19:26:20.481324263 +0000
--- src/version.c	2023-01-30 19:41:12.608941475 +0000
***************
*** 697,698 ****
--- 697,700 ----
  {   /* Add new patch number below this line */
+ /**/
+     1265,
  /**/

-- 
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 /// Bram Moolenaar -- Bram@Moolenaar.net -- http://www.Moolenaar.net   \\\
///                                                                      \\\
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