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 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112

#![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: Statement expressions should NOT be borrowed
//!
//! Bug: When vec.push(item) is in an if block or match arm, the compiler incorrectly
//! generates &mut vec.push(item), producing &mut () instead of ().
//!
//! Root Cause: Method call object gets &mut prefix, but format! produces
//! "&mut obj.push(args)" which parses as &mut (obj.push(args)) due to operator precedence.
//!
//! Fix: Wrap object in parentheses when it starts with & or &mut for instance method calls:
//! (&mut obj).push(args) instead of &mut obj.push(args)

#[path = "common/test_utils.rs"]
mod test_utils;

#[test]
fn test_vec_push_in_if_block_no_borrow() {
    // vec.push(item) in if block - should NOT generate &mut vec.push(item)
    let source = r#"
pub fn collect_items() -> Vec<i32> {
    let mut items: Vec<i32> = Vec::new()
    if true {
        items.push(1)
    }
    items
}
"#;
    let (result, compiles) = test_utils::compile_single_check(source);
    assert!(
        compiles,
        "Should compile. Generated:\n{}\n\nrustc error above",
        result
    );
    // Must NOT have &mut items.push - that produces &mut ()
    assert!(
        !result.contains("&mut items.push("),
        "Should NOT add &mut to statement expression. Got:\n{}",
        result
    );
    // Integer literals are often suffixed (_i32) in generated Rust
    assert!(
        result.contains("items.push(1") || result.contains("(&mut items).push(1)"),
        "Should have valid push call. Got:\n{}",
        result
    );
}

#[test]
fn test_vec_push_in_match_arm_no_borrow() {
    // vec.push(item) in match arm - statement position
    let source = r#"
pub fn process(x: i32) -> Vec<i32> {
    let mut result: Vec<i32> = Vec::new()
    match x {
        0 => result.push(0),
        1 => result.push(1),
        _ => result.push(-1),
    }
    result
}
"#;
    let (result, compiles) = test_utils::compile_single_check(source);
    assert!(
        compiles,
        "Should compile. Generated:\n{}\n\nrustc error above",
        result
    );
    assert!(
        !result.contains("&mut result.push("),
        "Should NOT add &mut to statement expression in match arm. Got:\n{}",
        result
    );
}

#[test]
fn test_vec_push_other_unit_methods_in_statement_position() {
    // Other ()-returning methods: clear(), etc.
    let source = r#"
pub fn clear_vec() {
    let mut v: Vec<i32> = Vec::new()
    v.push(1)
    v.clear()
}
"#;
    let (result, compiles) = test_utils::compile_single_check(source);
    assert!(
        compiles,
        "Should compile. Generated:\n{}\n\nrustc error above",
        result
    );
    assert!(
        !result.contains("&mut v.push("),
        "Should NOT add &mut to v.push(). Got:\n{}",
        result
    );
    assert!(
        !result.contains("&mut v.clear("),
        "Should NOT add &mut to v.clear(). Got:\n{}",
        result
    );
}