Module rust_constructor_detector 

AST-based constructor detection for Rust

This module enhances name-based constructor detection (Spec 117) with AST analysis to catch non-standard patterns.

Detection Strategy

1. Return Type: Function returns Self (or Result<Self>, Option<Self>)
2. Body Pattern: Struct initialization or simple field assignments
3. Complexity: Low cyclomatic (≤5), no loops, minimal branching

Examples Caught

// Non-standard name (missed by name-based)
pub fn create_default_client() -> Self {
    Self { timeout: Duration::from_secs(30) }
}

// Builder method (different role)
pub fn set_timeout(mut self, timeout: Duration) -> Self {
    self.timeout = timeout;
    self
}

Fallback

If AST unavailable (syntax errors, unsupported language):

• Falls back to name-based detection (Spec 117)
• Graceful degradation, no failures

Structs

BodyPattern

ConstructorPatternVisitor

Visitor to detect constructor patterns in function body

Enums

ConstructorReturnType

Functions

analyze_function_body

Analyze function body for constructor patterns

extract_return_type

Extract return type from function signature using syn