`iter.map()` should not guarantee that the closure is executed for all the iterated elements.
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Description
This would allow things like optimizing iter::Map's implementation of skip.
Contributor guide
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First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reading the issue's proposal about iter::Map and skip, then investigate the Rust iterator semantics relevant to whether map closures must run for every element. Done requires a decided, clearly specified change that preserves the intended behavior while enabling the proposed optimization.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Feature
- Difficulty
- 5/5
- Estimated time
- Over a week
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 25/100