fix arithmetic operations with no space

[gomesalexandre]

fix #224

[jasonwilliams]

Thanks @gomesalexandre
I can see that breaking on '+' or '-' fixes the issue, but what is the preview_multiple_next() for? I don't see the usecase covered in the tests.

[gomesalexandre]

@jasonwilliams thanks for the review!
It was needed to peek x indexes further in a peekable iterator as opposed to preview_next that only peeks the next() value.
I will add more test cases cases with <digit>e(<digit>) in the context of arithmetic operations.

[jasonwilliams]

@gomesalexandre did you want us to look over this again?

[gomesalexandre]

@gomesalexandre did you want us to look over this again?

Would be lovely. Please let me know if you have some more ideas of tests that could be added in other places.

[jasonwilliams]

could you rebase @gomesalexandre ? ive merged some clippy fixes

[gomesalexandre]

could you rebase @gomesalexandre ? ive merged some clippy fixes

Here you go ✅

[jasonwilliams]

Looks good, thank you