[bug] get_slice_items fails with negative step #746
Description
I was struggling adding getitem to bytes using get_slice_items but it appears to also fails with string:
jimmy@x-or:~/trash/RustPython$ cargo run -- -c "print('result : ', 'abcd'[-1:-5:-1])"
Finished dev [unoptimized + debuginfo] target(s) in 0.23s
Running `target/debug/rustpython -c 'print('\''result : '\'', '\''abcd'\''[-1:-5:-1])'`
result :
jimmy@x-or:~/trash/RustPython$ python -c "print('result : ', 'abcd'[-1:-5:-1])"
result : dcbaand list :
jimmy@x-or:~/trash/RustPython$ python -c "print('result : ', [1,2,3,5,6][-1:-5:-1])"
result : [6, 5, 3, 2]
jimmy@x-or:~/trash/RustPython$ cargo run -- -c "print('result : ', [1,2,3,5,6][-1:-5:-1])"
Finished dev [unoptimized + debuginfo] target(s) in 0.41s
Running `target/debug/rustpython -c 'print('\''result : '\'', [1,2,3,5,6][-1:-5:-1])'`
result : []I can"t tell what's wrong for now