ABI Layer 2: prove single-use linear token semantics — flagship Idris2 proof#42
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Add Ephapaxiser.ABI.Semantics: a faithful model of single-use token state with the headline linearity property machine-checked. - Token (Fresh|Spent) with explicit consumed-state index. - Consumable t: proposition with NO constructor for the Spent (bad) case; Uninhabited (Consumable (spent token)) discharged by impossible clause. - Consumed before after: certificate of the unique Fresh -> Spent step. - consume: advances a Fresh token to Spent given Consumable evidence. - decConsumable: total, sound + complete Dec. - certifyConsume into the shared Result codes (Ok / AlreadyConsumed), with certifyConsumeSound (no believe_me) and certifySpentRejected. - Positive controls: freshTokenConsumable, consumeFreshSeven. - Negative control: spentTokenNotConsumable : Not (Consumable spent). Builds clean (exit 0, zero warnings). A deliberately false proof that a spent token is Consumable is rejected by idris2, confirming the property is non-vacuous. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
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Summary
Raises ephapaxiser's Idris2 ABI to Layer 2 with its first flagship semantic proof. Ephapaxiser's headline is single-use (linear) semantics; this models a token state machine (
Fresh/Spent) and proves a token isConsumableonly whenFresh— an already-consumed (Spent) token has no consumability proof, so it can never be consumed twice.Mirrors the estate flagship-proof pattern: faithful state-indexed model, uninhabited bad case, sound+complete
Dec, certifier proven sound, positive + negative controls.Changes
src/interface/abi/Ephapaxiser/ABI/Semantics.idr— state-indexedToken,Consumable,Consumed,consume(returns the spent token with proof),decConsumable : Dec,certifyConsumeSound..ipkg.RSR Quality Checklist
Required
As Applicable
Testing
Verified with Idris2 0.7.0:
idris2 --build ephapaxiser-abi.ipkg→ exit 0, zero warnings. Adversarial check: a deliberately-false proof was rejected.build/removed.🤖 Generated with Claude Code
https://claude.ai/code/session_01A6PSzJWpRxtzGDjUCEh7Mx
Generated by Claude Code