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fix: liberalize rules for atoms by allowing leading '' #6114

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david-christiansen
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This PR liberalizes atom rules by allowing '' to be a prefix of an atom, after #6012 only added an exception for '' alone, and also adds some unit tests for atom validation.

@david-christiansen david-christiansen added the changelog-language Language features, tactics, and metaprograms label Nov 18, 2024
@github-actions github-actions bot added the toolchain-available A toolchain is available for this PR, at leanprover/lean4-pr-releases:pr-release-NNNN label Nov 18, 2024
leanprover-community-mathlib4-bot added a commit to leanprover-community/batteries that referenced this pull request Nov 18, 2024
leanprover-community-mathlib4-bot added a commit to leanprover-community/mathlib4 that referenced this pull request Nov 18, 2024
@leanprover-community-bot leanprover-community-bot added the builds-mathlib CI has verified that Mathlib builds against this PR label Nov 18, 2024
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@david-christiansen david-christiansen added this pull request to the merge queue Nov 18, 2024
Merged via the queue into leanprover:master with commit b8d6e44 Nov 18, 2024
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JovanGerb pushed a commit to JovanGerb/lean4 that referenced this pull request Jan 21, 2025
This PR liberalizes atom rules by allowing `''` to be a prefix of an
atom, after leanprover#6012 only added an exception for `''` alone, and also adds
some unit tests for atom validation.
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