[erlang-bugs] Document of lists:append/2
Mon Feb 10 04:58:36 CET 2014
Right. I guess I'm questioning the accuracy of the document.
On Sun, Feb 9, 2014 at 7:52 PM, Siraaj Khandkar <> wrote:
> This is just a surprising side effect of dynamic typing. To perform the
> append, the left list is traversed and the right is just blindly used as
> a tail, so it is never introspected and thus never has an opportunity to
> On 2/9/14, 10:30 PM, Yoshihiro Tanaka wrote:
> > 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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