meta: adopt and enforce the csimp axiom-census rule - #16
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Jul 27, 2026
Every @[csimp] replacement lemma must carry its own assert_axioms entry in TrustBoundary.lean: the compiler applies a csimp substitution in all downstream compiled code, but the axioms of the lemma's proof are not propagated into downstream native_decide axiom tracking (open lean4#7463), so an unchecked csimp lemma would be an axiom-smuggling channel. Adds the guard script and CI job (currently zero csimp declarations, trivially covered), notes the rule in the README's trust discussion, and commits the underlying research document (design/lean-native-trust-research.md). Co-authored-by: Claude Fable 5 <noreply@anthropic.com>
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Adopts the rule that every
@[csimp]replacement lemma must carry its ownassert_axiomsentry inCompElliptic/TrustBoundary.lean, and enforces it withscripts/check_csimp_census.sh(new CI job). Rationale: the axioms of a csimp proof are not propagated into downstreamnative_decideaxiom tracking (open lean4#7463), so a csimp lemma whose axioms go unchecked would be an axiom-smuggling channel invisible to every consumer's census entry. There are currently zero@[csimp]declarations, so the check passes trivially; it exists so the first one cannot land without a census check.Also commits the underlying mechanism study (
design/lean-native-trust-research.md: whatnative_decide, the IR interpreter, and precompiled dylibs actually trust, against lean4 v4.30.0 sources) and notes the rule in the README's trust discussion.The check is a guard against accidental omissions, not adversarial code; its scope note says so.
🤖 Claude Fable 5