This reverts commit d93dcb5.

* Add `Location.ghostify`

* Update the parser's `make_ghost` to save an allocation in some cases

* Promote parser.ml

* Fix ghost locations in modular extension AST nodes

* Add missing ghostification

Thank you, Carl!

* Comment update about ghostiness (+ word-wrapping)

* Add ghostify function (#1)

* Add `Location.ghostify`

* Update the parser's `make_ghost` to save an allocation in some cases

* Promote parser.ml

* Mark the inner mutable arrays for iarrays as ghost

* Add comment about ghostification for comprehensions

* Explain that ppxlib is where the ghostiness requirement is enforced

* Use `Ast_helper.default_loc` to default the generated locations

* Restore propagating the location, now via `Ast_helper.default_loc`

* Drop obsolete comment

* Rewrite advisory comment about locations

…boxed

…boxed

…boxed

* Parse `#0`, `-#1`, `oxcaml#2.7`, and `-oxcaml#3.1`, treating them as boxed

* Fix parsing of unsuffixed unboxed int literals

* Rewrite CR comment

* Update comment

* promote-menhir

* Unboxed literal tests

* Adjust error for unsuffixed unboxed integers