rust-ascii
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Made AsciiStr::split generic over Pattern
AsciiStr::split currently only accepts an AsciiChar as an argument. This PR makes it so split now accepts any Pattern, and also adds impl Pattern for AsciiChar so as to not break existing code.
The APIs std::str::pattern::{Pattern, CharSearcher} are nightly only. Should we introduce a nightly feature for enabling these. Are there better ways of conditionally building code for nightly?