According to :help arglistid(), it returns zero for invalid argument.
But it returns -1 instead.
diff -r 7af530381fec runtime/doc/eval.txt
--- a/runtime/doc/eval.txt Sun Aug 17 17:24:07 2014 +0200
+++ b/runtime/doc/eval.txt Tue Aug 19 21:28:25 2014 +0900
@@ -2113,7 +2113,7 @@
Return the argument list ID. This is a number which
identifies the argument list being used. Zero is used for the
global argument list.
- Return zero if the arguments are invalid.
+ Return -1 if the arguments are invalid.
Without arguments use the current window.
With {winnr} only use this window in the current tab page.
--
Yukihiro Nakadaira - [email protected]
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