feat(lang): capture a policy's ref when withdrawing from its credential#335
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Withdrawing from a script stake credential runs its script, so a ref-backed policy used as a `cardano::withdrawal` `from` should contribute its `ref` UTxO as a reference input, like an input's `from` or a mint/burn policy. Lower the withdrawal `from` under `capturing_policy_refs()`. Add a `withdraw` example tx and assert it contributes one reference input. Record the new executing position in the spec: §7.13.4 notes that chain extensions may add executing positions, and §8.3 states a ref-backed `from` is referenced per §7.13.4. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Extends the policy reference-script tracking (#332, #333) to
cardano::withdrawal.Why
Withdrawing from a script stake credential runs that script — the same situation as spending via an input's
fromor minting/burning under a policy. So aref-backed policy used as a withdrawalfromshould contribute itsrefUTxO as a reference input.Change
WithdrawalField::Fromnow lowers undercapturing_policy_refs(), mirroringMintBlockField::AmountandInputBlockField::From. One line; the existing accumulator/drain handles the rest (withdrawals lower viaadhoc, before the drain inTxDef::into_lower).Spec
The merged spec (#334) listed the executing positions as input
from/ mint / burn. Withdrawal is a Cardano construct, so:ref-backedfromis referenced per §7.13.4.Test
New
withdrawexample tx (cardano::withdrawal { from: <ref-backed policy> }) asserts one reference input.cargo test -p tx3-lang: 167 passed, 0 failed.🤖 Generated with Claude Code