nl_tokens: * META (( export #t ))
pl_tokens: function sc_filter ( proc , l1 ) { var dummy = { cdr : null } ; var tail = dummy ; while ( l1 !== null ) { if ( proc ( l1 . car ) !== false ) { tail . cdr = sc_cons ( l1 . car , null ) ; <mask> = tail . cdr ; } l1 = l1 . cdr ; } return dummy . cdr ; }