backtrace 0.3.76: backtrace::Backtrace

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# backtrace 0.3.76 Backtrace Capture and Symbol Resolution API Contracts

## What `search_known_solution` answered
`search_known_solution` returned NO_SAFE_MATCH for pkg:cargo/backtrace@0.3.76. This sample establishes the verified contracts for backtrace::Backtrace capture, resolution, and inspection in version 0.3.76.

## What a model would have written instead
A model may assume that `Backtrace::new()` and `Backtrace::new_unresolved()` behave identically regarding symbol availability, or expect `frame.symbols()` to be populated before `resolve()` is invoked. Models also frequently assume serialization is enabled by default or attempt to parse backtrace strings manually instead of using structured frame accessors and `fmt::Debug`.

## How the wrong version fails
Accessing `frame.symbols()` on an unresolved backtrace before calling `resolve()` yields an empty slice without error, leading to silent assertion failures. Expecting manual string parsing or non-standard constructors fails compilation against the public crate API.

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::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::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:sha256:3121645f3ded59dc32e65f4818f4d469808242546255d7a631c6b253c60b0a82","contract":["Backtrace::new captures stack frames and resolves symbols","Backtrace::new_unresolved captures unresolved frames and resolve populates symbol names","Backtrace::frames returns non-empty slice of BacktraceFrame with instruction pointers","Backtrace implements Clone and fmt::Debug formatting"],"goal":"verify backtrace::Backtrace in pkg:cargo/backtrace@0.3.76","kind":"HOW","packages":["pkg:cargo/backtrace@0.3.76"],"schemaVersion":1,"symbols":["backtrace::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::Backtrace"],"verifierAdapter":"cargo@1"}

{
  "schemaVersion": 1,
  "goal": "verify backtrace::Backtrace in pkg:cargo/backtrace@0.3.76",
  "kind": "HOW",
  "packages": [
    "pkg:cargo/backtrace@0.3.76"
  ],
  "symbols": [
    "backtrace::Backtrace"
  ]
}

//! Clean-room verification sample for backtrace.

pub use backtrace::*;

use backtrace::Backtrace;

fn main() {
    // 1. Backtrace::new captures stack frames and resolves symbols
    let bt = Backtrace::new();
    let frames = bt.frames();
    assert!(!frames.is_empty(), "Backtrace::new must capture at least one frame");

    let mut resolved_any = false;
    for frame in frames {
        let _ = frame.ip();
        let _ = frame.symbol_address();
        if !frame.symbols().is_empty() {
            resolved_any = true;
        }
    }
    assert!(resolved_any, "Resolved backtrace must contain resolved symbols");

    // 2. Backtrace::new_unresolved captures unresolved frames and resolve populates symbol names
    let mut bt_unresolved = Backtrace::new_unresolved();
    let frames_before = bt_unresolved.frames();
    assert!(!frames_before.is_empty(), "Backtrace::new_unresolved must capture frames");
    assert!(
        frames_before.iter().all(|f| f.symbols().is_empty()),
        "Frames in new_unresolved must not have resolved symbols initially"
    );

    bt_unresolved.resolve();
    let frames_after = bt_unresolved.frames();
    assert!(!frames_after.is_empty(), "Frames must persist after calling resolve()");
    let resolved_after = frames_after.iter().any(|f| !f.symbols().is_empty());
    assert!(resolved_after, "Symbols must be populated after calling resolve()");

    // 3. Backtrace::frames returns non-empty slice of BacktraceFrame with instruction pointers
    let frame_slice = bt.frames();
    assert!(frame_slice.len() > 0, "frames() should return a non-empty slice");
    let first_ip = frame_slice[0].ip();
    assert!(!first_ip.is_null(), "Frame IP should not be null");

    // 4. Backtrace implements Clone and fmt::Debug formatting
    let cloned_bt = bt.clone();
    assert_eq!(bt.frames().len(), cloned_bt.frames().len(), "Cloned backtrace must match frame count");

    let debug_output = format!("{:?}", bt);
    assert!(!debug_output.is_empty(), "Debug formatting must produce non-empty output");

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