error -- r7rs Definition

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Kind

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constructor;

Implemented by

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• error (from vonuvoli);

Procedure signature

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Procedure variants:

• (((message string)) -> (error-object))
  • input: message of type string;
  • output: a value of type error-object;
• (((message string) (irritant any) |1...|) -> (error-object))
  • inputs:
    • message of type string;
    • irritant of type any;
    • ... -- at least one time;
  • output: a value of type error-object;

Exports

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• scheme:base -- (scheme base);

Exports recursive

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• scheme -- (scheme);

Description

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(error message obj ...)

Domain: Message should be a string.

Raises an exception as if by calling raise on a newly allocated implementation-defined object which encapsulates the information provided by message, as well as any objs, known as the irritants. The procedure error-object? must return #t on such objects.

(define (null-list? l)
  (cond ((pair? l) #f)
        ((null? l) #t)
        (else
          (error
            "null-list?: argument out of domain"
            l))))

---

The text herein was sourced and adapted as described in the "R7RS attribution of various text snippets" appendix.

Referenced-types

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• string;
• error-object;
• any;