Sample

anstream 1.0.0

Verified sample for cargo anstream 1.0.0. The contract ran on rust 1 · linux alpine/x64 · docker and passed: AutoStream::always preserves ANSI escape codes…

sha256:46fa394dbbd4260ef6432bc4a5678ecdc43423fc14332caae10db78725c8f507

MIT-0

Execution evidence

The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.

Evidence basis: Signed contract pass
Verification receipts: 1
Signing keys that built it: 1

Declared environment linux · alpine · musl x64 cargo

Verification-run environments

Environment	Contract	Stages	Run
rust 1 · linux alpine/x64 · docker ed25519:c1973797be207ac4	PASS	compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1rust:1-alpine@sha256:a10e64dd139b…	2026-09-19

Case

HOW

Goal: verify pkg:cargo/anstream@1.0.0
Packages: anstream 1.0.0
Created: 2026-09-19T02:15:34Z

Contract

AutoStream::always preserves ANSI escape codes in output
AutoStream::new with ColorChoice::Never strips ANSI escape codes from output
StripStream directly strips ANSI escape sequences from output

Files

Cargo.lock
Cargo.toml
PROMPT.md
csx.json
spec.json
src/lib.rs
test/contract.rs

Download the source artifact (tar.gz)

Source

Cargo.lock

# This file is automatically @generated by Cargo.
# It is not intended for manual editing.
version = 4

[[package]]
name = "anstream"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "824a212faf96e9acacdbd09febd34438f8f711fb84e09a8916013cd7815ca28d"
dependencies = [
 "anstyle",
 "anstyle-parse",
 "anstyle-query",
 "anstyle-wincon",
 "colorchoice",
 "is_terminal_polyfill",
 "utf8parse",
]

[[package]]
name = "anstyle"
version = "1.0.14"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "940b3a0ca603d1eade50a4846a2afffd5ef57a9feac2c0e2ec2e14f9ead76000"

[[package]]
name = "anstyle-parse"
version = "1.0.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "52ce7f38b242319f7cabaa6813055467063ecdc9d355bbb4ce0c68908cd8130e"
dependencies = [
 "utf8parse",
]

[[package]]
name = "anstyle-query"
version = "1.1.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "40c48f72fd53cd289104fc64099abca73db4166ad86ea0b4341abe65af83dadc"
dependencies = [
 "windows-sys",
]

[[package]]
name = "anstyle-wincon"
version = "3.0.11"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "291e6a250ff86cd4a820112fb8898808a366d8f9f58ce16d1f538353ad55747d"
dependencies = [
 "anstyle",
 "once_cell_polyfill",
 "windows-sys",
]

[[package]]
name = "colorchoice"
version = "1.0.5"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "1d07550c9036bf2ae0c684c4297d503f838287c83c53686d05370d0e139ae570"

[[package]]
name = "is_terminal_polyfill"
version = "1.70.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "a6cb138bb79a146c1bd460005623e142ef0181e3d0219cb493e02f7d08a35695"

[[package]]
name = "once_cell_polyfill"
version = "1.70.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "384b8ab6d37215f3c5301a95a4accb5d64aa607f1fcb26a11b5303878451b4fe"

[[package]]
name = "sample-anstream"
version = "1.0.0"
dependencies = [
 "anstream",
]

[[package]]
name = "utf8parse"
version = "0.2.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "06abde3611657adf66d383f00b093d7faecc7fa57071cce2578660c9f1010821"

[[package]]
name = "windows-link"
version = "0.2.1"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "f0805222e57f7521d6a62e36fa9163bc891acd422f971defe97d64e70d0a4fe5"

[[package]]
name = "windows-sys"
version = "0.61.2"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "ae137229bcbd6cdf0f7b80a31df61766145077ddf49416a728b02cb3921ff3fc"
dependencies = [
 "windows-link",
]

Cargo.toml

[package]
name = "sample-anstream"
version = "1.0.0"
edition = "2021"
publish = false

[dependencies]
anstream = "=1.0.0"

[[bin]]
name = "contract"
path = "test/contract.rs"

PROMPT.md

Clean-room public code sample — generation instructions

Write a brand-new, minimal, self-contained code sample in this clean-room directory.
Do not copy, paraphrase, or reference any existing project source. Work only from this spec.

A csx.json manifest scaffold already exists. Do not recreate it from memory. Preserve its case.goal, packages and symbols; fill its empty case.contract with exact assertions and correct its environment, commands and verifierAdapter for the files you generate.

Goal: verify pkg:cargo/anstream@1.0.0
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/anstream@1.0.0
Required runtime conditions:
  - ecosystem: golang
  - language: go
  - packageManager: go@1.26.6
  - runtime: go@1.26.6

Rules:
  - One focused purpose; the smallest project that proves the goal.
  - Include a contract test (test/contract.*) that runs OFFLINE and exits 0 exactly when the goal behavior works.
  - Pin every dependency with a lockfile so resolution is reproducible.
  - No secrets, credentials, or tokens. No real URLs (only example.com or localhost). No absolute paths.
  - No personal names, emails, company names, or project identifiers of any kind.
  - No binaries and no generated output (node_modules, dist, target, venv, .git, .env).
  - Keep it under 200 files and 256KB packed.

csx.json

{"case":{"caseId":"case:sha256:7d9557879ac4e4866cd495779c0f47b42df5840bb3b29ef782982f39a0554903","contract":["AutoStream::always preserves ANSI escape codes in output","AutoStream::new with ColorChoice::Never strips ANSI escape codes from output","StripStream directly strips ANSI escape sequences from output"],"goal":"verify pkg:cargo/anstream@1.0.0","kind":"HOW","packages":["pkg:cargo/anstream@1.0.0"],"schemaVersion":1},"contractCommand":["cargo","run","--offline"],"environment":{"arch":"x64","distro":"alpine","ecosystem":"cargo","libc":"musl","os":"linux","packageManager":"cargo","schemaVersion":1},"license":"MIT-0","packages":["pkg:cargo/anstream@1.0.0"],"schemaVersion":1,"subject":"pkg:cargo/anstream@1.0.0","verifierAdapter":"cargo@1"}

spec.json

{
  "schemaVersion": 1,
  "goal": "verify pkg:cargo/anstream@1.0.0",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/anstream@1.0.0"
  ],
  "runtimeConditions": {
    "ecosystem": "golang",
    "language": "go",
    "packageManager": "go@1.26.6",
    "runtime": "go@1.26.6"
  }
}

src/lib.rs

//! Clean-room verification sample for anstream.

pub use anstream::*;

test/contract.rs

use anstream::{AutoStream, ColorChoice, StripStream};
use std::io::Write;

fn main() {
    // 1. AutoStream::always preserves ANSI escape codes in output
    let mut always_stream = AutoStream::always(Vec::new());
    write!(always_stream, "\x1b[31mRed text\x1b[0m").expect("write failed");
    let always_bytes = always_stream.into_inner();
    assert_eq!(always_bytes, b"\x1b[31mRed text\x1b[0m");

    // 2. AutoStream::new with ColorChoice::Never strips ANSI escape codes from output
    let mut never_stream = AutoStream::new(Vec::new(), ColorChoice::Never);
    write!(never_stream, "\x1b[31mRed text\x1b[0m").expect("write failed");
    let never_bytes = never_stream.into_inner();
    assert_eq!(never_bytes, b"Red text");

    // 3. StripStream directly strips ANSI escape sequences from output
    let mut strip_stream = StripStream::new(Vec::new());
    write!(strip_stream, "\x1b[1m\x1b[32mBold Green\x1b[0m").expect("write failed");
    let strip_bytes = strip_stream.into_inner();
    assert_eq!(strip_bytes, b"Bold Green");

    println!("All anstream contract assertions passed successfully.");
}

Origin Seeder

anonymous