leanprover / leanprover/lean4

Users should be prevented from declaring internal names

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Description

As in Lean 3, declaration names starting with _ should be rejected.

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

No file or test is named. Search the declaration-name validation path for handling names beginning with _, then compare the corresponding Lean 3 behavior. Done means internal names are rejected while ordinary declaration names remain accepted; add or run focused validation tests if the repository identifies them.

Written by the indexing model from the issue text.

Assessment

Domain
compilers
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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