patch 8.2.2012: Vim9: confusing error message when using bool wrongly

Problem:    Vim9: confusing error message when using bool wrongly.
Solution:   Mention "Bool" instead of "Special". (closes #7323)
diff --git a/src/testdir/test_vim9_expr.vim b/src/testdir/test_vim9_expr.vim
index 63bfdd8..b7897fe 100644
--- a/src/testdir/test_vim9_expr.vim
+++ b/src/testdir/test_vim9_expr.vim
@@ -1292,6 +1292,13 @@
   call CheckDefFailure(["var x = 'a' .. 0z32"], 'E1105:', 1)
   call CheckDefFailure(["var x = 'a' .. function('len')"], 'E1105:', 1)
   call CheckDefFailure(["var x = 'a' .. function('len', ['a'])"], 'E1105:', 1)
+
+  call CheckScriptFailure(['vim9script', 'var x = 1 + v:none'], 'E611:', 2)
+  call CheckScriptFailure(['vim9script', 'var x = 1 + v:null'], 'E611:', 2)
+  call CheckScriptFailure(['vim9script', 'var x = 1 + v:true'], 'E1138:', 2)
+  call CheckScriptFailure(['vim9script', 'var x = 1 + v:false'], 'E1138:', 2)
+  call CheckScriptFailure(['vim9script', 'var x = 1 + true'], 'E1138:', 2)
+  call CheckScriptFailure(['vim9script', 'var x = 1 + false'], 'E1138:', 2)
 endfunc
 
 func Test_expr5_fails_channel()