- checker sym .. ok? ....procedure
creates a checker routine, i.e. a unuary procedure, which returns its argument unchanged, provided it passes all ok? tests. If not, an error is generated with location sym, whose default is 'checker.
creates a checker routine, i.e. a unuary procedure, which returns its argument unchanged, provided it passes all ok? tests. If not, an error is generated with location sym, whose default is 'checker.