Output and errors

4 builtins. Every example below ran on the evaluator, and the result shown is what it returned.

display

arity 1

(display x)

Writes a value for humans (strings without quotes).

(display "hi ") (display '(1 "two"))

stdouthi (1 two)

arity 1

(write x)

Writes a value so it reads back (strings quoted).

(write "hi") (write '(1 "two"))

stdout"hi"(1 "two")

arity 0

(newline)

Writes a line break.

(display 1) (newline) (display 2)

stdout1 2

arity 1+

(error message irritant ...)

(error message irritant ...): stops with an error.

(error "bad input:" 42)

errorbad input: 42