patch 8.2.2264: Vim9: no error for mismatched :endfunc or :enddef

Problem:    Vim9: no error for mismatched :endfunc or :enddef.
Solution:   Check for the mismatch. (issue #7582)

src/testdir/test_vim9_func.vim

@@ -79,6 +79,25 @@ def Test_funcdepth_error()
   set maxfuncdepth&
 enddef
 
+def Test_endfunc_enddef()
+  var lines =<< trim END
+    def Test()
+      echo 'test'
+      endfunc
+    enddef
+  END
+  CheckScriptFailure(lines, 'E1151:', 3)
+
+  lines =<< trim END
+    def Test()
+      func Nested()
+        echo 'test'
+      enddef
+    enddef
+  END
+  CheckScriptFailure(lines, 'E1152:', 4)
+enddef
+
 def ReturnString(): string
   return 'string'
 enddef