Make error impls public #1
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A change from 0.8 to 0.9 moved errors behind an opaque type that only allows us to display the error string. This behavior prevents us from inspecting the error's cause + line/col #s, which prevents us from handling error programmatically. So this PR simply makes the internals of the error public for us to manipulate again- the real solution would be adding an interface to the errors to that properly reveals this information again.