assert-rs / libtest2 / 19139459401

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Add support for `#[should_panic]` macro (#151)

This is done by recursively parsing attributes following the
`#[libtest2::test]` macro, and then parsing the first `#[should_panic]`
macro encountered. If a macro is encountered then the test will be run
within a `catch_unwind`, which is done by wrapping it in the
`assert_panic` macro (function style).

Potentially supporting multiple `#[should_panic]` macros is left for the
future.

Fixes https://github.com/assert-rs/libtest2/issues/15

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