| Uncaught exception:
 | 
 |   1. #<&failed-type-check predicate: external?>
 | 
 |   2. #<&message message: "type check failed">
 | 
 |   3. #<&origin origin: external-null?>
 | 
 |   4. #<&irritants irritants: (#<procedure simple-format>)>
 | 
 |   5. #<&source file: "hoot/errors.scm" line: 95 column: 22>
 |