// Test VecForeachIdx macro
    bool test_vec_foreach_idx(void) {
    WriteFmt("Testing VecForeachIdx\n");
    
    // Create a vector of integers

    // Use VecForeachIdx to verify indices and values
    bool result = true;
    VecForeachIdx(&vec, item, idx) {
    result = result && (item == values[idx]);
    };

    // Use VecForeachIdx to calculate weighted sum (value * index)
    int weighted_sum = 0;
    VecForeachIdx(&vec, item, idx) {
    weighted_sum += item * idx;
    }

    // Make idx go out of bounds in VecForeachIdx by modifying vector during iteration
    bool test_vec_foreach_idx_out_of_bounds_access(void) {
    WriteFmt("Testing VecForeachIdx where idx goes out of bounds (should crash)\n");
    
    typedef Vec(int) IntVec;

    
    // VecForeachIdx has explicit bounds checking: if ((idx) >= (v)->length) LOG_FATAL(...)
    VecForeachIdx(&vec, val, idx) {
    WriteFmt("Accessing idx {} (vec.length={}): {}\n", idx, vec.length, val);

    // Make idx go out of bounds in basic VecForeachIdx by modifying vector during iteration
    bool test_vec_foreach_idx_basic_out_of_bounds_access(void) {
    WriteFmt("Testing basic VecForeachIdx where idx goes out of bounds (should crash)\n");
    
    typedef Vec(int) IntVec;

    
    // Basic VecForeachIdx now has explicit bounds checking: if ((idx) >= (v)->length) LOG_FATAL(...)
    VecForeachIdx(&vec, val, idx) {
    WriteFmt("Accessing idx {} (vec.length={}): {}\n", idx, vec.length, val);

    
    Vec(int) vi = VecInit();
    VecForeachIdx(&vi, val, i) {
    WriteFmtLn("{}", val);
    }

    /// TAGS: Foreach, Vec, Iteration, Loop
    ///
    #define VecForeach(v, var) VecForeachIdx((v), (var), UNPL(iter))
    
    ///

    /// idx[in]     : Name of the variable to be used for iterating over indices (i64).
    ///
    #define StrForeachIdx(str, chr, idx) VecForeachIdx((str), (chr), idx)
    
    ///

    if (VecLen(vec) > 0) {
    int sum = 0;
    VecForeachIdx(vec, item, idx) {
    sum += item + (int)idx;
    }

    if (VecLen(vec) > 0) {
    size_t total_len = 0;
    VecForeachIdx(vec, str, idx) {
    total_len += strlen(str.data) + idx;
    }

    if (VecLen(vec) > 0) {
    size_t total_len = 0;
    VecForeachIdx(vec, str, idx) {
    total_len += strlen(str) + idx;
    }