Overhaul parser and add support for errors #3
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This PR overhauls the parser so that it supports returning a more detailed error when something goes wrong during parsing. The error contains what the parser expected, and the span of source code that the parser found the error to be in
I've added a cargo feature so that the
miettecrate can be used to display the error in a pretty way, but that feature is optional. Another dependency I've added is thethiserrorprocedural macro which allows the error type to implementstd::error::Error