Kawa, the Java-based Scheme system

Node:Special named constants, Next:Keywords, Previous:Multiple values, Up:Extensions

### Special named constants

#!optional | Constant

Special self-evaluating literal used in lambda parameter lists before optional parameters.

#!rest | Constant

Special self-evaluating literal used in lambda parameter lists before the rest parameter.

#!key | Constant

Special self-evaluating literal used in lambda parameter lists before keyword parameters.

#!eof | Constant

The end-of-file object. Note that if the Scheme reader sees this literal at top-level, it is returned literally. This is indistinguishable from coming to the end of the input file. If you do not want to end reading, but want the actual value of `#!eof`, you should quote it.

#!void | Constant

The void value. Same as `(values)`. If this is the value of an expression in a read-eval-print loop, nothing is printed.

#!null | Constant

The Java `null` value. This is not really a Scheme value, but is useful when interfacing to low-level Java code.