meta predicate call

Josef Frydl <[email protected]>
Newsgroups gmane.comp.ai.prolog.swi
Message-ID <[email protected]> 
Please help see this

% /Users/joseffrydl/.plrc compiled 0.00 sec, 1 clauses
Welcome to SWI-Prolog (Multi-threaded, 32 bits, Version 6.3.17)
Copyright (c) 1990-2013 University of Amsterdam, VU Amsterdam
SWI-Prolog comes with ABSOLUTELY NO WARRANTY. This is free software,
and you are welcome to redistribute it under certain conditions.
Please visit http://www.swi-prolog.org for details.

For help, use ?- help(Topic). or ?- apropos(Word).

?- F =..[is_list,[1,2,3]],call(F).
F = is_list([1, 2, 3]).

?- 
why  F is not executed

Thanks Josef Frydl
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