Create a package declaration and create its body after
SQL>
SQL>
SQL> create or replace
2 package shield as
3 procedure foo;
4 end shield;
5 /
Package created.
SQL>
SQL> create or replace
2 package body shield as
3 procedure foo is
4 l_n number;
5 begin
6 null;
7 end foo;
8 end;
9 /
Package body created.
SQL>
SQL> show errors;
No errors.