ruchy 4.2.1

A systems scripting language that transpiles to idiomatic Rust with extreme quality engineering
Documentation 
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    use super::*;
    use proptest::prelude::*;

    fn test_eval_literal(lit: &Literal) -> Value {
        match lit {
            Literal::Integer(i, _) => Value::Integer(*i),
            Literal::Float(f) => Value::Float(*f),
            Literal::String(s) => Value::from_string(s.clone()),
            Literal::Bool(b) => Value::Bool(*b),
            Literal::Unit => Value::Nil,
            _ => Value::Nil,
        }
    }

    proptest! {
        /// Property: Wildcard pattern always matches any value
        #[test]
        fn prop_wildcard_always_matches(value: i64) {
            let pattern = Pattern::Wildcard;
            let val = Value::Integer(value);
            let result = try_pattern_match(&pattern, &val, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");
            prop_assert!(result.is_some());
            prop_assert_eq!(
                result.expect("result should be Some in test").len(),
                0
            ); // No bindings
        }

        /// Property: Identifier pattern always matches and binds
        #[test]
        fn prop_identifier_always_binds(name in "[a-z]{1,10}", value: i64) {
            let pattern = Pattern::Identifier(name.clone());
            let val = Value::Integer(value);
            let result = try_pattern_match(&pattern, &val, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");
            prop_assert!(result.is_some());
            let bindings = result.expect("result should be Some in test");
            prop_assert_eq!(bindings.len(), 1);
            prop_assert_eq!(&bindings[0].0, &name);
            prop_assert_eq!(&bindings[0].1, &Value::Integer(value));
        }

        /// Property: Literal pattern matches only exact values
        #[test]
        fn prop_literal_exact_match(target: i64, test: i64) {
            let pattern = Pattern::Literal(Literal::Integer(target, None));
            let val = Value::Integer(test);
            let result = try_pattern_match(&pattern, &val, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");

            if target == test {
                prop_assert!(result.is_some());
            } else {
                prop_assert!(result.is_none());
            }
        }

        /// Property: Tuple pattern matches only correct arity
        #[test]
        fn prop_tuple_arity_must_match(size in 1usize..5) {
            let patterns: Vec<Pattern> = (0..size)
                .map(|i| Pattern::Identifier(format!("x{i}")))
                .collect();
            let pattern = Pattern::Tuple(patterns);

            // Correct arity - should match
            let values: Vec<Value> = (0..size).map(|i| Value::Integer(i as i64)).collect();
            let val = Value::Tuple(std::sync::Arc::from(values));
            let result = try_pattern_match(&pattern, &val, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");
            prop_assert!(result.is_some());

            // Wrong arity (one less) - should not match
            if size > 1 {
                let wrong_values: Vec<Value> = (0..size-1).map(|i| Value::Integer(i as i64)).collect();
                let wrong_val = Value::Tuple(std::sync::Arc::from(wrong_values));
                let result = try_pattern_match(&pattern, &wrong_val, &test_eval_literal)
                    .expect("try_pattern_match should succeed in test");
                prop_assert!(result.is_none());
            }
        }

        /// Property: EnumVariant unit pattern matches only unit variants
        #[test]
        fn prop_unit_variant_no_data(variant_name in "[A-Z][a-z]{1,10}") {
            let pattern = Pattern::QualifiedName(vec!["Enum".to_string(), variant_name.clone()]);

            // Unit variant (no data) - should match
            let val_unit = Value::EnumVariant {
                enum_name: "Enum".to_string(),
                variant_name: variant_name.clone(),
                data: None,
            };
            let result = try_pattern_match(&pattern, &val_unit, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");
            prop_assert!(result.is_some());

            // Tuple variant (with data) - should NOT match
            let val_tuple = Value::EnumVariant {
                enum_name: "Enum".to_string(),
                variant_name,
                data: Some(vec![Value::Integer(42)]),
            };
            let result = try_pattern_match(&pattern, &val_tuple, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");
            prop_assert!(result.is_none());
        }

        /// Property: TupleVariant pattern binds all elements
        #[test]
        fn prop_tuple_variant_binds_all(count in 1usize..4, values in prop::collection::vec(any::<i64>(), 1..4)) {
            let count = count.min(values.len());
            let patterns: Vec<Pattern> = (0..count)
                .map(|i| Pattern::Identifier(format!("x{i}")))
                .collect();

            let pattern = Pattern::TupleVariant {
                path: vec!["Type".to_string(), "Variant".to_string()],
                patterns,
            };

            let variant_values: Vec<Value> = values[..count].iter()
                .map(|&v| Value::Integer(v))
                .collect();

            let val = Value::EnumVariant {
                enum_name: "Type".to_string(),
                variant_name: "Variant".to_string(),
                data: Some(variant_values),
            };

            let result = try_pattern_match(&pattern, &val, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");
            prop_assert!(result.is_some());

            let bindings = result.expect("result should be Some in test");
            prop_assert_eq!(bindings.len(), count);

            for i in 0..count {
                prop_assert_eq!(&bindings[i].0, &format!("x{i}"));
                prop_assert_eq!(&bindings[i].1, &Value::Integer(values[i]));
            }
        }

        /// Property: Or pattern matches if ANY subpattern matches
        #[test]
        fn prop_or_pattern_any_match(target: i64, options in prop::collection::vec(any::<i64>(), 1..5)) {
            let patterns: Vec<Pattern> = options.iter()
                .map(|&v| Pattern::Literal(Literal::Integer(v, None)))
                .collect();

            let pattern = Pattern::Or(patterns);
            let val = Value::Integer(target);
            let result = try_pattern_match(&pattern, &val, &test_eval_literal)
                .expect("try_pattern_match should succeed in test");

            if options.contains(&target) {
                prop_assert!(result.is_some());
            } else {
                prop_assert!(result.is_none());
            }
        }

        /// Property: Pattern matching never panics (robustness)
        #[test]
        fn prop_never_panics(value: i64) {
            let patterns = vec![
                Pattern::Wildcard,
                Pattern::Identifier("x".to_string()),
                Pattern::Literal(Literal::Integer(value, None)),
                Pattern::QualifiedName(vec!["Type".to_string(), "Variant".to_string()]),
            ];

            let val = Value::Integer(value);

            for pattern in patterns {
                // Should not panic
                let _ = try_pattern_match(&pattern, &val, &test_eval_literal);
            }
        }
    }