Newline handling fixes for expression parsing

[sbillig]

What was wrong?

Incorrect newline handling in expression binding power and tuple expressions.

How was it fixed?

@Y-Nak did it. (These commits are cherry-picked from #981)

To-Do

• [ ] OPTIONAL: Update Spec if applicable

• [ ] Add entry to the release notes (may forgo for trivial changes)

• [ ] Clean up commit history

[Y-Nak]

Thanks!