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[WIP] --start-with#2979

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joshlf wants to merge 1 commit intoG8b674511787c67f5fdb20d28e10d9387316037aefrom
Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e
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[WIP] --start-with#2979
joshlf wants to merge 1 commit intoG8b674511787c67f5fdb20d28e10d9387316037aefrom
Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e

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@joshlf joshlf commented Feb 4, 2026


⬇️ Download this PR

Branch

git fetch origin refs/heads/Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e && git checkout -b pr-Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e FETCH_HEAD

Checkout

git fetch origin refs/heads/Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e && git checkout FETCH_HEAD

Cherry Pick

git fetch origin refs/heads/Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e && git cherry-pick FETCH_HEAD

Pull

git pull origin refs/heads/Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e

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gherrit-pr-id: Gbeca6e8c6a2f4e776c00719d86c9eabf4f63fe2e
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Summary of Changes

Hello @joshlf, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces three new Rust test cases under the tools/hermes/tests/cases/success directory. These tests are specifically designed to validate the Hermes tool's capabilities in handling various scenarios involving Rust's Box smart pointer and dynamic trait objects (dyn Trait). The new files cover error propagation with boxed trait objects, conditional allocation of boxed values, and direct instantiation of Box<dyn Trait>, each accompanied by Lean specifications to ensure their correct interpretation within a formal verification context.

Highlights

  • New Test Case: Box Error Handling: Added repro_box_anyhow.rs to test the handling of Box<dyn std::fmt::Debug> when returned as an error within a Result type.
  • New Test Case: Conditional Box Creation: Introduced repro_box_branch.rs to verify the correct behavior of Box<u32> creation within conditional branches (if/else statements).
  • New Test Case: Box Instantiation: Added repro_dyn_trait.rs to test the direct instantiation and usage of Box<dyn std::fmt::Debug> trait objects.
  • Lean Specifications Included: All new test files include Lean specifications for a simple foo function, indicating their role in formal verification or analysis by the Hermes tool.

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Changelog
  • tools/hermes/tests/cases/success/repro_box_anyhow.rs
    • Added a new test file to verify Box<dyn std::fmt::Debug> usage in error returns.
  • tools/hermes/tests/cases/success/repro_box_branch.rs
    • Added a new test file to verify conditional creation of Box<u32>.
  • tools/hermes/tests/cases/success/repro_dyn_trait.rs
    • Added a new test file to verify the instantiation of Box<dyn std::fmt::Debug>.
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Code Review

This pull request introduces three new test cases (repro_box_anyhow.rs, repro_box_branch.rs, and repro_dyn_trait.rs) under tools/hermes/tests/cases/success. These additions aim to expand the test coverage for the hermes tool, specifically for scenarios involving Box and dynamic traits. The changes are well-contained within new files.

Comment on lines +2 to +7
///@ lean spec foo(x : U32)
///@ ensures |ret| ret.val = x.val
///@ proof
///@ simp [foo]
pub fn foo(x: u32) -> u32 {
x
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medium

The foo function and its associated Lean annotations are duplicated across repro_box_anyhow.rs, repro_box_branch.rs, and repro_dyn_trait.rs. To improve maintainability and reduce redundancy, consider extracting this common helper into a shared test utility module if this pattern is expected to be used in more test cases.

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.02%. Comparing base (0c4aad9) to head (d3ff7ee).

Additional details and impacted files
@@                            Coverage Diff                             @@
##           G8b674511787c67f5fdb20d28e10d9387316037ae    #2979   +/-   ##
==========================================================================
  Coverage                                      92.02%   92.02%           
==========================================================================
  Files                                             19       19           
  Lines                                           6029     6029           
==========================================================================
  Hits                                            5548     5548           
  Misses                                           481      481           

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