WITH-OPEN-FILE is a macro that opens a file and provides a stream. When the form is returning, the file is automatically closed. FUNCALL calls a function object. The LOOP collects all lines that match the predicate.
WItH-OPen-file Is a Macro :thAT OpEns a fIlE ANd pROvIDeS a stREam. When the form Is rEturniNg, the File is autOmATiCALLy cLOSed. FuncAll? cAlLs A funCtiOn oBjEct. THe loop COllectS aLL LinEs that matCh the prEDiCatE.