symbol-highlight not working on words terminating with an apostrophe

[PierreR]

symbol-highlight does not seem to work on words terminating with a ' (like foo').

How to reproduce it:

On a scratch buffer (or anywhere else):

• enable automatic-symbol-highlight (SPC tha)
• copy twice the word foo',
• press * on one of them => symbol-highlight has zero match.

System Info

- OS: gnu/linux
- Emacs: 24.5.1
- Spacemacs: 0.105.0
- Spacemacs branch: haskell-indentation (rev. 94af1e2)
- Distribution: spacemacs
- Layers:
```elisp
(asciidoc auto-completion emacs-lisp erc dash dockerfile emacs-lisp extra-langs git markdown
          (haskell :variables haskell-enable-ghci-ng-support t haskell-enable-ghc-mod-support t)
          org
          (shell :variables shell-default-term-shell "/bin/zsh" shell-default-height 30 shell-default-position 'bottom)
          salt syntax-checking spell-checking puppet python version-control yaml)

Could be related with #2706

[StreakyCobra]

Reproduced here. It's a bug because either:

• Symbols don't contain ' and then the symbol is foo and it should recognize the other foo
• Symbols contain ' and then the symbol is foo' and it should recognize the other foo'

[jb55]

👋 codetriage time

Is this still an issue? If so how should we proceed?

[syl20bnr]

Well I suppose that's a bug to fix in the ahs package which is quite an old package, not sure there is a maintainer for it.
Or maybe that's not a bug in ahs and this is the major mode which does not define symbols correctly ?

[syl20bnr]

I suppose we are talking about Haskell here ?

[PierreR]

The original bug is not Haskell related. As I mentioned it even happens in a scratch buffer when automatic-symbol-highlight is enabled. That said, the annoyance might be higher in Haskell as it is common to use ' at the end of names.

I could try again and see if it is still an issue with the latest version.

[gracjan]

Note that in haskell-mode we try really hard to put symbol constituent property on apostrophes that are symbol constituent, so inside or at the end of an identifier. What regexp does ahs use to find symbols?

[TheBB]

(defconst ahs-default-symbol-regexp "^[0-9A-Za-z/_.,:;*+=&%|$#@!^?-]+$"
  "Default symbol regular expression.")

I'm not sure why this doesn't use \_<, \s_ and \_>

[gracjan]

So if there is somebody willing to customize ahs for Haskell all the info needed is in haskell-lexeme.el.

[github-actions]

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