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-rw-r--r--test/functional/eval/null_spec.lua3
1 files changed, 2 insertions, 1 deletions
diff --git a/test/functional/eval/null_spec.lua b/test/functional/eval/null_spec.lua
index 14b2d964d5..afe999e1fa 100644
--- a/test/functional/eval/null_spec.lua
+++ b/test/functional/eval/null_spec.lua
@@ -101,7 +101,8 @@ describe('NULL', function()
null_expr_test('is accepted as an empty list by writefile()',
('[writefile(L, "%s"), readfile("%s")]'):format(tmpfname, tmpfname),
0, {0, {}})
- null_expr_test('does not crash add()', 'add(L, 0)', 0, 1)
+ null_expr_test('makes add() error out', 'add(L, 0)',
+ 'E742: Cannot change value of add() argument', 1)
null_expr_test('makes insert() error out', 'insert(L, 1)',
'E742: Cannot change value of insert() argument', 0)
null_expr_test('does not crash remove()', 'remove(L, 0)',