0.34.0

CHANGES:

5.3 support

5.3 support is being added gradually over the course of its development.
This section should be updated with each relevant PR.

Note to maintainers: until 5.3 support is officially released, this section
should be excluded from the release, see RELEASING.md for
details.

• Add initial OCaml 5.3 support (#487, @NathanReb, @hhugo, @nojb)

• Initialise OCaml 5.3's lexer with the keywords setting from OCAMLPARAM or
  the new -keywords driver's CLI option to allow the standalone ppx driver to
  process old packages using effect as an identifier
  (#535, @dra27, @NathanReb)

Other changes

• Add Pprintast.binding, longident and payload (#542, @mattiasdrp)

• Fix deriving_inline round-trip check so that it works with 5.01 <-> 5.02
  migrations (#519, @NathanReb)

• Add ppxlib's AST pretty-printing utilities in Ppxlib.Pp_ast and
  a ppxlib-pp-ast executable in a new separate ppxlib-tools package
  (#517, #525, #537, @NathanReb)

• Change -dparsetree from a sexp output to a pretty printed AST, closer
  to what the compiler's -dparsetree is.
  (#530, @NathanReb)

• Add Parsetree documentation comments to Ast_builder functions (#518, @patricoferris)

• Support class type declarations in derivers with the new, optional arguments
  {str,sig}_class_type_decl in Deriving.add (#538, @patricoferris)