Implement conversion of Result⟶exception #73
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Option seems to work fine on rustc 1.43+ but not 1.42.
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This allows an
extern "Rust"function to be declared with a Result<T> return type. The implementation is allowed to return any error type that implements Display. We'll to_string the error and throw an exception of typerust::Erroron the C++ side.The reverse direction of exception⟶Result will be implemented in a separate PR.
#53