Warn if supposedly unreachable code is provably reachable
Open
Nobody has claimed this yet.
A-lints
C-feature-request
T-compiler
T-lang
- Dominant language
- Rust
- Stars
- 119k
- Forks
- 16.2k
- PR merge metrics
- PR metrics pending
Description
Code
if true { unsafe { unreachable_unchecked() } };
if true { unreachable!() };
Current output
No warnings
Desired output
- warning: this is ub if called...
- warning: this will panic when called...
Rationale and extra context
No response
Other cases
No response
Rust Version
rustc 1.83.0-nightly (c52c23b6f 2024-09-16)
Anything else?
No response
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 compiler entry points. Reproduce the examples with rustc 1.83.0-nightly and trace the existing unreachable-code analysis; done means the two examples produce the requested warnings without warnings for genuinely unreachable code.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- rust
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100