}
    
    VecForeachPtrIdx(patterns, pattern, i) {
    if (BitVecStartsWith(bv, pattern)) {
    return i;

    }
    
    VecForeachPtrIdx(patterns, pattern, i) {
    if (BitVecEndsWith(bv, pattern)) {
    return i;

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

    
    // Use VecForeachPtrIdx to set each value to its index
    VecForeachPtrIdx(&vec, item_ptr, idx) {
    *item_ptr = idx;
    }

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

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

    /// TAGS: Foreach, Vec, Iteration, Loop, Pointer
    ///
    #define VecForeachPtr(v, var) VecForeachPtrIdx((v), (var), UNPL(iter))
    
    ///

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

    if (VecLen(vec) > 0) {
    int sum = 0;
    VecForeachPtrIdx(vec, item_ptr, idx) {
    sum += *item_ptr + (int)idx;
    }

    if (VecLen(vec) > 0) {
    size_t total_len = 0;
    VecForeachPtrIdx(vec, str_ptr, idx) {
    total_len += strlen(str_ptr->data) + idx;
    }

    if (VecLen(vec) > 0) {
    size_t total_len = 0;
    VecForeachPtrIdx(vec, str_ptr, idx) {
    total_len += strlen(*str_ptr) + idx;
    }