Rust Language Support - Qlty Docs

Summary

Feature	Status	Notes
Maintainability	✔	Complexity, duplication, code smells
Linting	✔
Auto-formatting	✔
Custom checks	✔
Security scanning	✔	AppSec, dependencies, and secrets
Code metrics	✔
Code coverage	✔

Details

Maintainability
Complexity	✔	Aka cognitive complexity
Cyclomatic complexity	✔
Identical code duplication	✔
Similar code duplication	✔
Code smells	✔
Linters
Clippy	✔	Rust linter providing a collection of lints
Auto-formatters
rustfmt	✔	Official Rust code formatter
Custom checks
ast-grep	✔
Semgrep	✔
ripgrep	✔
Security scanning
Gitleaks	✔	Secrets scanning
OSV-Scanner	✔	Dependency scanning (SCA)
Semgrep	✔	AppSec (SAST)
Trivy	✔	Dependency scanning (SCA)
TruffleHog	✔	Secrets scanning
Code coverage
cargo test	✔
grcov	✔
Cobertura coverage format	✔
LCOV coverage format	✔

File extensions

By default, Rust files are defined as:

[file_types.rust]
globs = ["*.rs"]

These patterns can be overridden from qlty.toml.

Test detection

Rust test functions are automatically detected using the following patterns:

[language.rust]
test_syntax_patterns = ["""
    (
      (mod_item
        name: (identifier) @name)
      (#eq? @name "test")
    )
  """, """
  (
    (attribute_item
      (attribute
        (identifier) @meta_item))
    (function_item) @function
    (#eq? @meta_item "test")
  )
  """]

Supported Rust versions

We officially support Rust 1.30 and later for maintainability checks and code coverage. Each plugin may have its own version requirements.