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a1358530f5
Define new functions to manipulate error descriptors and add support for `signal` to *re*signal a previous error. * src/eval.c (Fsignal): Make the second arg optional and document the possibility of passing a whole error descriptor to re-signal it. (signal_or_quit): Fix a few corner case issues when DATA is `nil` and ERROR_SYMBOL is an error descriptor. * lisp/subr.el (error-type-p, error--p, error-type, error-data) (error-has-type-p, error-slot-value): New function. * doc/lispref/control.texi (Handling Errors): Prefer "error descriptor" to "error description". Use the new single-arg call to `signal` to re-throw an error. Document `error-type`, `error-data` and `error-slot-value`. (Error Symbols): Document the new functions `error-type-p` and `error-has-type-p`. |
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