`unsafe opaque` does not allow unsafe body
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bug
P-low
- Dominant language
- Lean
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Description
unsafe opaque verySafeCast : α → β := unsafeCast
-- (kernel) invalid declaration, it uses unsafe declaration 'unsafeCast'
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
Start by running the Lean reproducer from the issue and tracing the compiler or kernel handling of unsafe opaque declarations. No source files or tests are named, so locate the relevant declaration-safety checks first. Done means the shown declaration is accepted without the reported invalid-declaration error, with regression coverage for the reproducer.
Written by the indexing model from the issue text.
Assessment
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 32/100