compiled_stream/1 is meaningful mainly in queries inside a compiled file, or in event handlers for compilation events.
[eclipse]: [user].
a.
:- compiled_stream(S), get_stream_info(S, name, File),
printf("Compiling stream %d, file %s\n", [S, File]).
Compiling stream 0, file user
^D
user compiled traceable 28 bytes in 0.00 seconds
yes.
[eclipse]: exec('cat a.pl', []).
a.
:- compiled_stream(S), get_stream_info(S, name, File),
printf("Compiling stream %d, file %s\n", [S, File]).
yes.
[eclipse]: [a].
Compiling stream 5, file /home/joe/a.pl
a.pl compiled traceable 28 bytes in 0.00 seconds
yes.