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This is a general question. In Crystal, what is the difference between an Exception and an Error?

For example, in the JSON package, there is both JSON::Error and a JSON::ParseException, which inherits from JSON::Error. Also, how do we know if a method might raise an Exception (or Error, I really don't know the difference)?

Ravern Koh
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There is no difference between Error and Exception, it's just inconsistent naming.

That should probably be standardized some day. IIRC the consensus was mostly to use Exception only for the general base class and use Error for all implementations for specific errors. In that scheme, JSON::ParseException should actually be JSON::ParseError.

Method descriptions should typically state which errors can be thrown, but this might not be a conclusive list (if at all). There is no way to semantically deduce all exception types that can be thrown by a specific method.

Johannes Müller
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    Thanks. Do you think a proposal to standardize naming/standardize listing errors/exceptions in docs would be good? – Ravern Koh Jan 08 '18 at 14:43