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6580d7e784
Fix `panic` message for `BTreeSet`'s `range` API and document `panic` cases Currently, the `panic` cases for [`BTreeSet`'s `range` API](https://doc.rust-lang.org/std/collections/struct.BTreeSet.html#method.range) are undocumented and produce a slightly wrong `panic` message (says `BTreeMap` instead of `BTreeSet`). Panic case 1 code: ```rust use std::collections::BTreeSet; use std::ops::Bound::Excluded; fn main() { let mut set = BTreeSet::new(); set.insert(3); set.insert(5); set.insert(8); for &elem in set.range((Excluded(&3), Excluded(&3))) { println!("{elem}"); } } ``` Panic case 1 message: ``` thread 'main' panicked at 'range start and end are equal and excluded in BTreeMap', /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/alloc/src/collections/btree/search.rs:105:17 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace ``` Panic case 2 code: ```rust use std::collections::BTreeSet; use std::ops::Bound::Included; fn main() { let mut set = BTreeSet::new(); set.insert(3); set.insert(5); set.insert(8); for &elem in set.range((Included(&8), Included(&3))) { println!("{elem}"); } } ``` Panic case 2: ``` thread 'main' panicked at 'range start is greater than range end in BTreeMap', /rustc/fe5b13d681f25ee6474be29d748c65adcd91f69e/library/alloc/src/collections/btree/search.rs:110:17 note: run with `RUST_BACKTRACE=1` environment variable to display a backtrace ``` This PR fixes the output messages to say `BTreeSet`, adds the relevant unit tests, and updates the documentation for the API. |
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