Operators not getting face applied

[ankhers]

I've noticed recently that operators ($, *, +, etc) are no longer getting a face applied to them.

In that screen shot, I expect * and + to have the same colour as the = and ::

[chrisdone]

Reproducing here too. May be caused by b53ba49. Probably the syntax table makes sense but it's a regression in terms of highlighting.

[gracjan]

@ankhers: Good catch! Thanks!

The story of this is rather interesting one so let me share:

Haskell operator characters used to be in Emacs symbol class, that was a mistake because 'emacs-symbol' is 'haskell-variable' or 'haskell-contructor' that is 'identifier'. Then there was a regexp setup to highlight _ as haskell-operator-face. Now documentation states that haskell-operator-face is font-lock-function-name-face when code says it is font-lock-variable-name-face, neither one seems proper.

Note also that haskell-mode post-fixes underscore and apostrophe into \w (word constituting class) characters.

Note also that neither c++-mode nor python-mode define special syntax rules for operators but then those languages are more keyword driven compared to Haskell.

[gracjan]

Meanwhile Agda has this: http://code.haskell.org/Agda/src/data/emacs-mode/agda2-highlight.el