erl_eval:expr/5 oddity

Leo Liu <[email protected]> Fri, 08 Jul 2016 23:26:00 +0800

Newsgroups	gmane.comp.lang.erlang.bugs
Message-ID	<[email protected]>

Assume X is

{'if',1,
      [{clause,1,[],
               [[{op,1,'=:=',{var,1,'Filters'},{nil,1}}]],
               [{atom,1,true}]},
       {clause,1,[],[[{atom,1,true}]],[{atom,1,false}]}]}

which is the abstract format for

  if Filters =:= [] -> true; true -> false end.

1> erl_eval:expr(X, [], none, none, none).
=> false

2) erl_eval:expr(X, [])
=> ** exception error: {unbound_var,'Filters'}

bug?

Leo

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