assert2 0.3.1

assert!(...) and check!(...) macros inspired by Catch2
Documentation 
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v0.3.1:
  * Use `$crate` to avoid the need for a direct dependency on `assert2`.

v0.3.0:
  * Use stabilized `proc_macro` expressions in place of `proc_macro_hack`.
  * Improve display of macro fragments on nightly.
  * Format expressions nicer on `stable` and `beta`.
  * Work around hygiene bug in Rust compiler ([issue #67062]).

[issue #67062]: https://github.com/rust-lang/rust/issues/67062

v0.2.1:
  * Prevent `assert!(a == b)` from consuming `a` or `b`.

v0.2.0:
  * Add feature-gated "let-assert" macro for nightly.
  * Implement semi-standard CLICOLOR / CLICOLOR_FORCE standard correctly.

v0.1.2:
  * Add `debug_assert!(...)` for parity with the standard library.

v0.1.1:
  * Synchronize README with library documentation.

v0.1.0:
  * Fully compatible with Rust stable.
  * Only use `proc_macro_span` on nightly.
  * Tweak colors in output.

v0.0.9:
  * Use `proc-macro-hack` to avoid `feature(proc_macro_hygiene)`.
  * Use auto-deref specialization to avoid `feature(proc_macro_hygiene)`.

v0.0.8:
  * Fix compilation error in assert!()
  * Limit scope of generated temporary variables

v0.0.7:
  * Update documentation.

v0.0.6:
  * Support additional arguments to print custom messages with failures.

v0.0.5:
  * Update documentation.
  * Fix images in documentation.

v0.0.4:
  * Support pattern matching with `let` expressions in assertions.