expect_macro: macro to replace expect/unwrap

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This macro allows you to write expect!(my_result) or expect!(my_result, "error: {}", my_result)

See the library docs for more information

LICENSE

The source code in this repository is Licensed under either of - Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0) - MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.