Use `_` both as 'don't care' value, as well as unused result placeholder
Open
Nobody has claimed this yet.
enhancement
Language Design
- Dominant language
- Rust
- Stars
- 126
- Forks
- 6
- PR merge metrics
- No merged PRs in 30d
Description
_ shouldn't be declared, rather, it's a keyword available everywhere.
So you could write:
int x, _ = divmod(20, 7)
bool wr_to
when do_write {
wr_to = false
} else {
wr_to = _
}
Contributor guide
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
The issue names no files, tests, or entry points. First locate where _ is parsed and validated, then trace the existing handling of don't-care values and unused results; done means both uses in the examples are accepted without requiring a declaration, with tests covering the behavior.
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
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100