windjammer 0.48.0

A simple language inspired by Go, Ruby, and Elixir that transpiles to Rust - 80% of Rust's power with 20% of the complexity
Documentation 
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#![cfg(any(
    not(any(
        feature = "parser_tests",
        feature = "analyzer_tests",
        feature = "codegen_tests",
        feature = "interpreter_tests",
        feature = "conformance_tests",
        feature = "integration_tests",
    )),
    feature = "analyzer_tests",
))]

/// TDD Test: Range iteration with borrowed variables
///
/// Root cause: for-loop ranges like `min..max` should NOT have borrowed bounds
/// Example: `for i in &min..&max` is wrong, should be `for i in min..max`
///
/// Related errors:
/// - E0277: Range<&i32> is not an iterator
/// - E0308: expected &i32, found i32 in range
/// - E0606: casting &i32 as usize is invalid
#[path = "common/test_utils.rs"]
mod test_utils;

#[test]
#[cfg_attr(tarpaulin, ignore)]
fn test_range_for_loop_no_borrow() {
    let source = r#"
pub fn iterate_range(min: i32, max: i32) {
    for i in min..max {
        println!("{}", i)
    }
}
"#;

    let rust_code = test_utils::compile_single_result(source).expect("compile");

    // Should generate: for i in min..max (NOT &min..&max)
    assert!(
        rust_code.contains("for i in min..max"),
        "Range bounds should not be borrowed, got: {}",
        rust_code
    );
    assert!(
        !rust_code.contains("&min.."),
        "Should not borrow range start, got: {}",
        rust_code
    );
    assert!(
        !rust_code.contains("..&max"),
        "Should not borrow range end, got: {}",
        rust_code
    );
}

#[test]
#[cfg_attr(tarpaulin, ignore)]
fn test_range_for_loop_with_arithmetic() {
    let source = r#"
pub fn iterate_calculated(start: i32, end: i32, size: i32) {
    for i in start.max(0)..end + 1.min(size) {
        let index = i as usize
    }
}
"#;

    let rust_code = test_utils::compile_single_result(source).expect("compile");

    // Range bounds should be values, not references
    assert!(
        rust_code.contains("for i in "),
        "Has for-loop, got: {}",
        rust_code
    );
    assert!(
        !rust_code.contains("&start"),
        "Start not borrowed, got: {}",
        rust_code
    );
    assert!(
        !rust_code.contains("..&end"),
        "End not borrowed in range, got: {}",
        rust_code
    );

    // Cast should work (no & in front)
    assert!(
        rust_code.contains("i as usize"),
        "Should be able to cast i directly, got: {}",
        rust_code
    );
}

#[test]
#[cfg_attr(tarpaulin, ignore)]
fn test_for_loop_variable_is_owned() {
    let source = r#"
pub fn use_loop_var(max: i32) {
    for i in 0..max {
        let doubled = i * 2
        let index = i as usize
    }
}
"#;

    let rust_code = test_utils::compile_single_result(source).expect("compile");

    // Loop variable should be owned (i32), not borrowed (&i32)
    // So we can multiply it and cast it without dereferencing
    assert!(
        rust_code.contains("i * 2"),
        "Should multiply i directly, got: {}",
        rust_code
    );
    assert!(
        rust_code.contains("i as usize"),
        "Should cast i directly, got: {}",
        rust_code
    );
    assert!(
        !rust_code.contains("*i"),
        "Should not need to dereference loop variable, got: {}",
        rust_code
    );
}