Home - News ( United States | United Kingdom | Italy | Germany ) - Football scores

Showing content from https://github.com/rust-lang/rust/issues/48117 below:

Step::steps_between does not distinguish overflow and unimplemented (unstable) · Issue #48117 · rust-lang/rust · GitHub

It returns Option<size>: https://doc.rust-lang.org/std/iter/trait.Step.html#tymethod.steps_between

And the comment says it uses None for overflow: https://doc.rust-lang.org/src/core/iter/range.rs.html#29

But it also uses None for unimplemented https://doc.rust-lang.org/src/core/iter/range.rs.html#155

And as a result, Range needs to return (0, None) when it gets None: https://doc.rust-lang.org/src/core/iter/range.rs.html#235-240

It would be nice to either

• Require that the method is implemented accurately (easy for fundamental integers; harder if Step is expected to support graph walks, but maybe not harder than PartialOrd)
• Change the type to something else, maybe Option<Option<usize>> or be more hint-like with (usize, Option<usize>)
• Something else

cc #42168

schneiderfelipeschneiderfelipe

RetroSearch is an open source project built by @garambo | Open a GitHub Issue

Search and Browse the WWW like it's 1997 | Search results from DuckDuckGo

HTML: 3.2 | Encoding: UTF-8 | Version: 0.7.4