backtrace 0.3.76

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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 pkg:cargo/backtrace@0.3.76
Kind: HOW

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

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:c47a0d54aa92608a37fe214fdc15d2dde801063128772dcf6803b126ad9f2ba1","contract":["Backtrace::new captures a non-empty list of stack frames","BacktraceFrame::ip returns a valid instruction pointer","Backtrace::new_unresolved captures frames and resolve resolves symbols","BacktraceFrame::symbols accesses resolved symbols","backtrace::trace visits frames and stops early when closure returns false","backtrace::resolve resolves symbols for a known frame IP"],"goal":"verify pkg:cargo/backtrace@0.3.76","kind":"HOW","packages":["pkg:cargo/backtrace@0.3.76"],"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/backtrace@0.3.76"],"schemaVersion":1,"subject":"pkg:cargo/backtrace@0.3.76","verifierAdapter":"cargo@1"}

{
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  "goal": "verify pkg:cargo/backtrace@0.3.76",
  "kind": "HOW",
  "packages": [
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  ]
}

//! Clean-room verification sample for backtrace.

pub use backtrace::*;

use backtrace::{Backtrace, BacktraceFrame, BacktraceSymbol, Frame, Symbol};

fn inner_function() -> Backtrace {
    Backtrace::new()
}

fn unresolved_function() -> Backtrace {
    Backtrace::new_unresolved()
}

fn main() {
    // 1. Backtrace::new captures a non-empty list of stack frames
    let bt = inner_function();
    let frames: &[BacktraceFrame] = bt.frames();
    assert!(!frames.is_empty(), "Backtrace frames should not be empty");

    // 2. BacktraceFrame::ip returns a valid instruction pointer
    let first_ip = frames[0].ip();
    assert!(!first_ip.is_null(), "Instruction pointer should not be null");

    // 3. Backtrace::new_unresolved captures frames and resolve resolves symbols
    let mut bt_unresolved = unresolved_function();
    assert!(!bt_unresolved.frames().is_empty(), "Unresolved backtrace should have frames");
    bt_unresolved.resolve();
    assert!(!bt_unresolved.frames().is_empty(), "Resolved backtrace should preserve frames");

    // 4. BacktraceFrame::symbols accesses resolved symbols
    let symbols: &[BacktraceSymbol] = frames[0].symbols();
    let _ = symbols.len();

    // 5. backtrace::trace visits frames and stops early when closure returns false
    let mut trace_count = 0;
    backtrace::trace(|_frame: &Frame| {
        trace_count += 1;
        false
    });
    assert_eq!(trace_count, 1, "Trace should stop immediately when closure returns false");

    // 6. backtrace::resolve resolves symbols for a known frame IP
    let mut resolved_count = 0;
    backtrace::resolve(first_ip, |_symbol: &Symbol| {
        resolved_count += 1;
    });
    let _ = resolved_count;

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