What is the correct syntax to break a PL/SQL procedure call in multiple lines?

I am calling a PL/SQL procedure like this:

execute util.verify(src_schema => '&username',
                    stab       => '&tab_name');

and I get these errors:

SQL> execute util.verify(src_schema => '&username',
BEGIN util.verify(src_schema => 'u1',; END;

                                     *
ERROR at line 1:
ORA-06550: line 1, column 57: 
PLS-00103: Encountered the symbol ";" when expecting one of the following:
( - + case mod new not null <an identifier>
<a double-quoted delimited-identifier> <a bind variable>
continue avg count current exists max min prior sql stddev
sum variance execute forall merge time timestamp interval
date <a string literal with character set specification>
<a number> <a single-quoted SQL string> pipe
<an alternatively-quoted string literal with character set specification>
<an alternatively


SQL>                   stab       => '&tab_name',
SP2-0734: unknown command beginning "stab      ..." - rest of line ignored.

Looks like I cannot just break the call in between at a ,. How can I write this call in multiple lines?