commit 3bdc90b7dfab314768a8f56454ea62929524f05c
author Bram Moolenaar <Bram@vim.org> Tue Dec 22 20:35:40 2020 +0100
committer Bram Moolenaar <Bram@vim.org> Tue Dec 22 20:35:40 2020 +0100
tree 0836d782d16f1749ae745e5a6f87972d1c0f5073
parent e5492609b3a153c631f1d600ecdef1af1c913bef

patch 8.2.2193: Vim9: can change constant in :def function

Problem:    Vim9: can change constant in :def function.
Solution:   Check if a variable is locked. (issue #7526)

src/testdir/test_vim9_func.vim

diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index eadd1d1..bdced02 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1022,6 +1022,17 @@
   writefile(lines, 'Xcall_const.vim')
   assert_fails('source Xcall_const.vim', 'E46:', '', 1, 'MyFunc')
   delete('Xcall_const.vim')
+
+  lines =<< trim END
+      const g:Aconst = 77
+      def Change()
+        # comment
+        g:Aconst = 99
+      enddef
+      call Change()
+      unlet g:Aconst
+  END
+  CheckScriptFailure(lines, 'E741: Value is locked: Aconst', 2)
 enddef
 
 " Test that inside :function a Python function can be defined, :def is not