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7cf4213283
This commit adds support for exporting a function defined in Rust that returns a `Result`, translating the `Ok` variant to the actual return value and the `Err` variant to an exception that's thrown in JS. The support for return types and descriptors was rejiggered a bit to be a bit more abstract and more well suited for this purpose. We no longer distinguish between functions with a return value and those without a return value. Additionally a new trait, `ReturnWasmAbi`, is used for converting return values. This trait is an internal implementation detail, however, and shouldn't surface itself to users much (if at all). Closes #841