— primitive generic: write object port
— primitive generic: display object port

When GOOPS is loaded, write and display become generic functions with special methods for printing

• objects - instances of the class <object>
• foreign objects - instances of the class <foreign-object>
• classes - instances of the class <class>
• generic functions - instances of the class <generic>
• methods - instances of the class <method>.

write and display print non-GOOPS values in the same way as the Guile primitive write and display functions.