PistonDevelopers / PistonDevelopers/dyon
Setting early return value fails with `?` using wrong error message
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bug
- Dominant language
- Rust
- Stars
- 1.9k
- Forks
- 56
- Avg merge
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- Merged PRs (30d)
- 6
Description
fn main() {
_ := unwrap(start())
}
fn start() -> res {
return = ok("")
_ := err("error")?
}
Output:
--- ERROR ---
main (source/test.dyon)
start (source/test.dyon)
Requires `->` on function `start`
7,10: _ := err("error")?
7,10: ^
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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 running the reproduced snippet from source/test.dyon and inspect the diagnostic path handling the ? expression and early return value. Trace where the "Requires -> on function start" message is selected; done means this case reports the appropriate error for the demonstrated code.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 38/100