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Follow-up #665: Make ink! chain extensions use is_result_type! utility macro
The https://github.com/paritytech/ink/pull/665 PR introduces some new is_result_type! utility macro to check at compile time whether some type is a Result using the Rust type system.
This means that we can get rid of the returns_result: bool ink! attribute of ink! chain extensions since it is now possible to infer this information via the proc. macro itself.