Tracking issue for RFC 2500, "Needle API (née Pattern API)" · Issue #56345 · rust-lang/rust (original) (raw)

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This is a tracking issue for the RFC "Needle API (née Pattern API)" (rust-lang/rfcs#2500).

Feature gates:

#![feature(needle)] (the traits and method in core::needle itself, and impl of these traits)
#![feature(str_find_range)] (find_range, rfind_range, match_ranges and rmatch_ranges methods for str)
#![feature(mut_str_needle_methods)] (split_mut, matches_mut, trim_mut etc for str)
#![feature(slice_needle_methods)] (find, matches, trim_matches, replace, split etc for [T])
#![feature(os_str_needle_methods)] (find, matches etc for OsStr)

Steps:

Implement the RFC (cc @rust-lang/libs @kennytm @bluss -- can anyone write up mentoring instructions?)
Stabilization PR (see instructions on forge)

Currently, due to Implied bounds rfcs#2089 and/or RFC: Associated type bounds of form MyTrait<AssociatedType: Bounds> rfcs#2289 not being implemented, using a Haystack in any algorithm would need to a redundant where clause.
Naive vs. fast algorithm for T: !Ord
Should we represent SharedHaystack using a more general concept of "cheaply cloneable"?
With a benefit of simplified API, do we want to merge Consumer and Searcher into a single trait?
Stabilization should require RFC 1672 (disjointness based on associated types).