Module helpers 

Test helper utilities for pattern comparison and validation

Structs

Difference

A single difference found during pattern comparison

EffectCounter

Counter for tracking side effects during traversal

PatternComparisonError

Error type for pattern comparison failures

PatternComparisonOptions

Options for pattern comparison

ValidationError

Error type for pattern validation failures

ValidationRules

Rules for pattern structure validation

Functions

assert_pattern_structure_valid

Validate that a pattern has valid structure

assert_patterns_equal

Compare two patterns for equality with detailed error messages

assert_patterns_equivalent

Compare patterns with equivalence checking options

counting_effect

Helper function to create a counting effectful function for testing