Multiple values

T now supports multiple return values. This makes procedure call and return uniform, in the sense that a procedure can be invoked with zero or more values and can return zero or more values. See page .

Like procedures, continuations have certain expectations about the number of arguments (values) that will be delivered to them. It is an error if more or fewer values are delivered than expected.

The idiom (RETURN) is useful for procedures that return an undefined value and many of the system procedures whose value(s) is undefined now return no value. However, the procedure undefined-value may provide a more informative error message.

Other forms, such as CATCH and RET, have been extended to allow multiple return values.