Rescript-compiler: Upgrade to 4.06.1

[bobzhang]

• Better tool support (bspack) lambda parser
  so that we can test lambda before even upgrade
  https://github.com/stedolan/malfunction/blob/master/src/malfunction_parser.ml
• Conditional compilation
• Upgrade bspack and ppx
• Upgrade Lambda convert

• Check some regression and new features

• new features which might impact the upgrade:

  • https://github.com/ocaml/ocaml/pull/305
  • https://github.com/ocaml/ocaml/pull/238
  • https://github.com/ocaml/ocaml/commit/aaeda7763bca8402cb2e53bdb57a456a04ada04b
    better compilation of tuple assignment
  • https://github.com/ocsigen/js_of_ocaml/issues/374
  • -keep-locs now become default (-no-keep-locs available)

• Optimizations/enhancement based on new features

  • detect int overflow #373 , #333
  • submodule as dict #190

• Enhancement

  • https://github.com/ocaml/ocaml/pull/170
    Could be exploited to give better syntax for JS big int
    Better error message for overflow checks

[shinzui]

Should this target 4.07 now since the release is imminent?

[omeid]

4.07 has been long released now.

[bobzhang]

We will cut a release 5 (for 4.02) and 6 ( for 4.06) very soon. Sorry we can not follow the release cycle of OCaml due to limited resources.

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.