backtrace 0.3.76: backtrace

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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 backtrace in pkg:cargo/backtrace@0.3.76
Kind: HOW

Use EXACTLY these public packages and versions:
  - pkg:cargo/backtrace@0.3.76
Demonstrate these symbols/APIs:
  - backtrace

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.

{"case":{"caseId":"case:sha256:77b7a3b8e2be0452278a3bcdd2965870e1579072ce63ce2d444f675abb85d9ec","contract":["backtrace::Backtrace::new captures non-empty stack frames","backtrace::Backtrace::new_unresolved captures frames and resolves symbols","backtrace::trace visits execution frames with valid instruction pointers"],"goal":"verify backtrace in pkg:cargo/backtrace@0.3.76","kind":"HOW","packages":["pkg:cargo/backtrace@0.3.76"],"schemaVersion":1,"symbols":["backtrace"]},"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/backtrace@0.3.76"],"schemaVersion":1,"subject":"pkg:cargo/backtrace@0.3.76","symbols":["backtrace"],"verifierAdapter":"cargo@1"}

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  "kind": "HOW",
  "packages": [
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  ],
  "symbols": [
    "backtrace"
  ]
}

//! Clean-room verification sample for backtrace.

pub use backtrace::{trace, Backtrace, BacktraceFrame};

use backtrace::{trace, Backtrace};

fn main() {
    // 1. backtrace::Backtrace::new captures non-empty stack frames
    let bt = Backtrace::new();
    let frames = bt.frames();
    assert!(!frames.is_empty(), "captured backtrace should contain frames");

    // 2. backtrace::Backtrace::new_unresolved captures frames and resolves symbols
    let mut unresolved_bt = Backtrace::new_unresolved();
    assert!(!unresolved_bt.frames().is_empty(), "unresolved backtrace should contain frames");
    unresolved_bt.resolve();
    assert!(!unresolved_bt.frames().is_empty(), "resolved backtrace frames should remain intact");

    // 3. backtrace::trace visits execution frames with valid instruction pointers
    let mut frame_count = 0;
    trace(|frame| {
        let ip = frame.ip();
        assert!(!ip.is_null(), "instruction pointer should not be null");
        frame_count += 1;
        frame_count < 10
    });
    assert!(frame_count > 0, "trace should have visited at least one frame");

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