ERROR:
Factor handbook » The language » Exception handling

Prev:	ignore-errors ( ... quot: ( ... -- ... ) -- ... )
Next:	Restartable errors

Vocabulary
syntax

Syntax

ERROR: class slots... ;

Inputs and outputs

class	a new tuple class to define
slots	a list of slot names

Word description
Defines a new tuple class and a word classname that throws a new instance of the error.

Notes
The following two snippets are equivalent:

ERROR: invalid-values x y ;

TUPLE: invalid-values x y ; : invalid-values ( x y -- * ) \ invalid-values boa throw ;

Definition

USING: classes.error classes.tuple.parser kernel parser ;

IN: syntax

SYNTAX: ERROR:
    parse-tuple-definition pick save-location define-error-class
    ;