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-rw-r--r--src/testdir/test_vim9_assign.vim6
1 files changed, 6 insertions, 0 deletions
diff --git a/src/testdir/test_vim9_assign.vim b/src/testdir/test_vim9_assign.vim
index 0a25ca4a7..57d205cee 100644
--- a/src/testdir/test_vim9_assign.vim
+++ b/src/testdir/test_vim9_assign.vim
@@ -288,6 +288,12 @@ def Test_assign_concat()
s ..= {a: 2}
END
v9.CheckDefAndScriptFailure(lines, ['E1105: Cannot convert dict to string', 'E734: Wrong variable type for .='], 2)
+
+ lines =<< trim END
+ var ls: list<string> = []
+ ls[-1] ..= 'foo'
+ END
+ v9.CheckDefExecAndScriptFailure(lines, 'E684: list index out of range: -1', 2)
enddef
def Test_assign_register()