/// body        : Body of this foreach loop.
    ///
    #define StrForeachPtrIdx(str, chrptr, idx, body) VecForeachPtrIdx((str), (chrptr), idx, {body})
    
    ///

    ///           index access) will result in a fatal log message and program termination.
    ///
    #define VecForeachPtr(v, var, body) VecForeachPtrIdx((v), (var), (____iter___), {body})
    
    ///

    }
    
    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) {
    printf("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; });
    
    // Check that the values in the vector are set to their indices

    // Deadend test: Make idx go out of bounds in VecForeachPtrIdx by modifying vector during iteration
    bool test_vec_foreach_ptr_idx_out_of_bounds_access(void) {
    printf("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, {
    printf("Accessing idx %zu (vec.length=%zu): %d\n", idx, vec.length, *val_ptr);