Collapse indicates the way a range/snapshot should be collapsed. `Same` is for a scope inside some kind of scope delimiter, e.g. `[| ... |]`, `[ ... ]`, `{ ... }`, etc. `Below` is for expressions following a binding or the right hand side of a pattern, e.g. `let x = ...`

Tag to identify the construct that can be stored alongside its associated ranges

Stores the range for a construct, the sub-range that should be collapsed for outlining, a tag for the construct type, and a tag for the collapse style