patch 8.2.1764: Vim9: no error when assigning to script var with wrong type Commit: https://github.com/vim/vim/commit/06f9c6940a88d132c85eb2a1b5034fa7653518ce Author: Bram Moolenaar <Bram@vim.org> Date: Sun Sep 27 21:27:40 2020 +0200 patch 8.2.1764: Vim9: no error when assigning to script var with wrong type Problem: Vim9: no error when assigning to script var with wrong type. Solution: Fix off-by-one error. (closes https://github.com/vim/vim/issues/7028)

--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -567,6 +567,16 @@ def Test_assignment_vim9script()
     assert_equal(44, t)
   END
   CheckScriptSuccess(lines)
+
+  lines =<< trim END
+      vim9script
+      var n: number
+      def Func()
+        n = 'string'
+      enddef
+      defcompile
+  END
+  CheckScriptFailure(lines, 'E1012: Type mismatch; expected number but got string')
 enddef
 
 def Mess(): string