prog.pas: In main program:
prog.pas:6: error: undeclared identifier `a' (first use in this routine)
prog.pas:6: error: (Each undeclared identifier is reported only once
prog.pas:6: error: for each routine it appears in.)
prog.pas:6: error: undeclared identifier `z' (first use in this routine)
prog.pas:9: warning: missing white space after decimal integer constant
prog.pas:9: error: syntax error before `]'
prog.pas:9: error: missing index expression