patch 9.1.0286: Vim9: E1027 with defcompile for abstract methods

Commit: 
https://github.com/vim/vim/commit/1af0fbf955f799392f614bc38f9d2fcbd9960526
Author: Yegappan Lakshmanan <yegap...@yahoo.com>
Date:   Tue Apr 9 21:39:27 2024 +0200

    patch 9.1.0286: Vim9: E1027 with defcompile for abstract methods
    
    Problem:  Vim9: E1027 with defcompile for abstract methods with
              non-void return types, but still compiles it
              (zzzyxwvut)
    Solution: Don't compile abstract methods
              (Yegappan Lakshmanan)
    
    fixes: #14443
    closes: #14447
    
    Signed-off-by: Yegappan Lakshmanan <yegap...@yahoo.com>
    Signed-off-by: Christian Brabandt <c...@256bit.org>

diff --git a/src/testdir/test_vim9_class.vim b/src/testdir/test_vim9_class.vim
index 77a2102c2..6d6d17851 100644
--- a/src/testdir/test_vim9_class.vim
+++ b/src/testdir/test_vim9_class.vim
@@ -10583,4 +10583,46 @@ def Test_lambda_block_in_class()
   v9.CheckScriptSuccess(lines)
 enddef
 
+" Test for defcompiling an abstract method
+def Test_abstract_method_defcompile()
+  # Compile an abstract class with abstract object methods
+  var lines =<< trim END
+    vim9script
+    abstract class A
+      abstract def Foo(): string
+      abstract def Bar(): list<string>
+    endclass
+    defcompile
+  END
+  v9.CheckScriptSuccess(lines)
+
+  # Compile a concrete object method in an abstract class
+  lines =<< trim END
+    vim9script
+    abstract class A
+      abstract def Foo(): string
+      abstract def Bar(): list<string>
+      def Baz(): string
+        pass
+      enddef
+    endclass
+    defcompile
+  END
+  v9.CheckScriptFailure(lines, 'E476: Invalid command: pass', 1)
+
+  # Compile a concrete class method in an abstract class
+  lines =<< trim END
+    vim9script
+    abstract class A
+      abstract def Foo(): string
+      abstract def Bar(): list<string>
+      static def Baz(): string
+        pass
+      enddef
+    endclass
+    defcompile
+  END
+  v9.CheckScriptFailure(lines, 'E476: Invalid command: pass', 1)
+enddef
+
 " vim: ts=8 sw=2 sts=2 expandtab tw=80 fdm=marker
diff --git a/src/version.c b/src/version.c
index d3fde434c..4cece61ad 100644
--- a/src/version.c
+++ b/src/version.c
@@ -704,6 +704,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    286,
 /**/
     285,
 /**/
diff --git a/src/vim9class.c b/src/vim9class.c
index 11e952c79..a6b3ee2dc 100644
--- a/src/vim9class.c
+++ b/src/vim9class.c
@@ -3723,7 +3723,9 @@ defcompile_class(class_T *cl)
        {
            ufunc_T *ufunc = loop == 1 ? cl->class_class_functions[i]
                                                : cl->class_obj_methods[i];
-           defcompile_function(ufunc, cl);
+           // Don't compile abstract methods
+           if (!IS_ABSTRACT_METHOD(ufunc))
+               defcompile_function(ufunc, cl);
        }
     }
 }

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