[erlang-bugs] Document of lists:append/2

[Yoshihiro Tanaka]

Hi,

In the document :http://www.erlang.org/doc/man/lists.html#append-2
It says:
append(List1, List2) -> List3, List1 = List2 = List3 = [T], T = term.

But considering the following behavior, it does not look correct:

1> [] ++ undef.
undef
2> undef ++ [].
** exception error: bad argument
     in operator  ++/2
        called as undef ++ []
3> [a,b] ++ undef.
[a,b|undef]
4>


Thoughts ?


Thank you
Yoshihiro
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