Add `rustversion::since_date` and `rustversion::before_date`

dtolnay / rustversion

Conditional compilation according to rustc compiler version

Apache License 2.0

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Add `rustversion::since_date` and `rustversion::before_date` #17

Closed Aaron1011 closed 4 years ago

Aaron1011 commented 4 years ago

These selectors work like since and before, but consider stable and beta compilers as well. This is useful when working around a compiler bug, since all versions that include a particular fix can be targeted.

I'm not sure how best to write a test for this