Use Case: denoland/deno - The Deno Runtime

Repository: https://github.com/denoland/deno Stack: Rust Test Date: 2025-12-08 Loctree Version: 0.6.2-dev

Overview

Testing loctree on Deno - a large Rust codebase with complex enum patterns.

Repository Scale

Metric	Value
Rust Files	611
Analysis Time	90.32 seconds
Total Symbols	8,559

Findings

Dead Code Detection

High Confidence: 1 finding
False Positive Rate: ~0% (method detection edge case)

Enum Variant Detection - MAJOR FIX

// Previously flagged as dead (WRONG):
pub enum NpmResolver<TSys: NpmResolverSys> {
    Byonm(ByonmNpmResolverRc<TSys>),
    Managed(ManagedNpmResolverRc<TSys>),
}
// NOW CORRECTLY TRACKED!

Version History

Version	FP Rate	Status
0.5.16	60%	Enum variants broken
0.6.1-dev	40%	Better
0.6.2-dev	~0%	EXCELLENT

Additional Findings

Twins: 604 duplicate export groups (expected)
Cycles: 12 circular dependencies (architectural patterns)

Commands Used

cd Deno
loct                              # Create snapshot
loct dead --confidence high       # Dead code analysis
loct cycles                       # Circular dependencies
loct twins                        # Duplicate detection

Verdict

A- EXCELLENT - Major improvement in Rust enum handling.

Key Insights

Enum Detection: Complex enum variants now tracked
Edge Case: Method vs function distinction needs refinement
Cycles: 12 real architectural cycles detected

Remaining Edge Case

One false positive: method in impl block detected as module export:

impl Hashes {
    pub const fn all(&self) -> [&'static str; 5] { ... }
}

This is a method, not a module-level function. Minor refinement needed.