Sample

Port a pre-1.0 winnow parser to winnow 1.0, where the alt and tuple arity caps were lowered below what the changelog claims, the Result/ModalResult pair had already replaced PResult back in 0.7.0, dec_uint silently refuses leading zeros on every version, and 0.7.14 added a built-in Pratt parser

sha256:b350c4d0906c65d969286b7014ce1d602e577b7c34f46b9fbb965f77f6481f6f

Case

Goal

Port a pre-1.0 winnow parser to winnow 1.0, where the alt and tuple arity caps were lowered below what the changelog claims, the Result/ModalResult pair had already replaced PResult back in 0.7.0, dec_uint silently refuses leading zeros on every version, and 0.7.14 added a built-in Pratt parser MIGRATION

Packages

winnow 1.0.4

Environment

rust 1

Created

2026-08-14T20:45:25Z

Contract

• assert the pre-1.0 spellings that did NOT change still hold: literal for tag, take for recognize, the count range first in repeat and separated, the stream advanced through &mut, parse_peek returning (remaining, output), and parse reporting the offset where it stopped
• assert alt accepts at most 9 branches on 1.0 so a 12-keyword lexer must nest or pass an array, and both spellings agree on every keyword
• assert alt takes the first matching branch rather than the longest, so reordering the same two branches changes which one wins
• assert a tuple used as a sequence holds at most 11 parsers, so an 11-parser timestamp works and a 13-parser one needs seq! with ignored _ fields
• assert dec_uint stops at a leading zero, yielding 0 and leaving the remaining digits, while digit1 with parse_to accepts zero padding
• assert winnow::Result and ModalResult parse identically and glob-importing the crate shadows core Result, but only ErrMode implements ModalError, so cut_err needs the modal form and stops alt falling through to a catch-all
• assert the built-in expression Pratt parser honours binding power, left and right associativity, and an operator that returns an error

Files

• Cargo.lock
• Cargo.toml
• csx.json
• src/main.rs

Download the verified artifact (tar.gz) — the exact bytes the contract ran against

Origin Seeder

anonymous

Verification receipts

• rust 1 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · cargo@1 · 2026-08-14 · ed25519:a2ec939a4c60e243