Backward incompatible changes are marked with “⚠”.

• New option tuareg-mode-line-other-file.
• New mode tuareg-menhir-mode. Note that C-c C-c launches the compilation.
• ⚠ tuareg-eval-phrase (C-c C-e and C-x C-e) now evaluate the smallest set of phrases containing the region if the latter is active.
• ⚠ tuareg-eval-phrase now skips ;; even on a separate line when moving forward. This permits quick evaluation of multiple phrases in succession.
• ⚠ tuareg-eval-region (C-c C-r): only send the content of the region to the REPL.
• Be more subtle in phrase detection.
• Bogus mismatched parentheses at the end of comment fixed.
• ⚠ show-paren-mode: also highlight comment delimiters. You can turn that off by setting tuareg-comment-show-paren to nil.
• Syntax highlighting improvements: much faster; much better highlighting of function, class, and method arguments (including setting the font-lock-multiline property); [] and :: have the constructor face; first class module, type nonrec, raise_notrace, with type are handled. Finer highlighting of infix operators. Support for binding operators. Moreover, font-lock now has 3 possible levels of fontification (see the README).
• The switch .ml ↔ .mli now uses the Emacs built-in find-file and was extended to .eliom ↔ .eliomi and .mly ↔ .mli. It also works for pre-processed files named .pp.ml and .pp.mli.
• When switching from an .ml to a non-existing .mli file using C-c C-a, one is offered to fill the .mli buffer with the generated interface.
• Set beginning-of-defun-function and end-of-defun-function which allows to go to the beginning of the current function (resp. end) with C-M-home, C-M-a or ESC C-home (resp. C-M-end, C-M-e, or ESC C-end).
• ⚠ beginning-of-defun (C-M-a, C-M-home) is now repeatable. Previously it would not move the cursor if invoked at the beginning of a defun. Now it goes to the start of the previous defun, which is the standard in Emacs and generally more useful.
• ⚠ Movement by defun now considers and clauses of a type or declarative let to be defuns in their own right, since that's closer to how programmers think. This generally makes defun-based operations more useful.
• ⚠ tuareg-comment-dwim is now bound to C-c C-; (fixes #149).
• Fix the highlighting of errors locations in interactive mode.
• ocamldebug: Handle correctly the new code pointer format (issue #205).
• Rework electric functions (fixes issues #150 and #162).
• Update the compilation regexp to detect warnings and errors for the OCaml ≥ 4.08 (fixes #202).
• Autoload compilation error regexp so it is correct even if Tuareg was not loaded.
• Messages from recent OCaml compiler versions are now parsed correctly for severity and source location. This includes precise parsing of the location start and end columns. Exception backtraces are now also recognised.
• Ancillary locations are now treated as Info-level messages, not errors in their own right. This way they no longer contribute to Emacs's compilation-mode error count, but they will be ignored by next-error and previous-error. Set compilation-skip-threshold to 0 if you want next-error to step into these locations.
• Evaluation of phrases: evaluate the above phrase if the point is in or after comments immediately following the let-binding (without separating blank lines).
• Better indentation of empty lines (fixes #179).
• Use a pty to communicate with the ocaml process (fixes #83).
• tuareg-opam: syntax highlighting updates.
• ⚠ Remove tuareg-light, you should now use tuareg.
• class type is now parsed correctly (#239).
• Improved indentation of class definition with non-hanging object (#239). The new behaviour agrees with ocp-indent and seems to be the more modern usage. initialize clauses are also indented correctly.
• Better default colour for extension nodes on dark background. tuareg-font-lock-extension-node-face was nigh-unreadable against a dark background. The face now uses the default background colour.
• Ocamldoc (** ... *) comments are now fontified by their structure. This makes markup constructs stand out in order to improve legibility and reduces the risk of mistakes. The body text is set in font-lock-doc-face as before; mark-up constructs use tuareg-font-lock-doc-markup-face, which defaults to font-lock-doc-markup-face (new in Emacs 28) if available.

Note that the mode tuareg-dune which was in the development version of this package is now part of Dune.