Do Emacs support font ligatures?

[Oleksandr Gavenko]

Today raising popularity of programming fonts with ligatures:

* https://github.com/i-tu/Hasklig
* https://github.com/tonsky/FiraCode
* https://github.com/larsenwork/monoid

Of course Emacs has trick with

  (font-lock-add-keywords
   'emacs-lisp-mode
   `(("(\\<\\(lambda\\)\\>"
      (1 (progn (compose-region (match-beginning 1) (match-end 1) ,(make-char 
'greek-iso8859-7 107)) font-lock-keyword-face)) )))

and I think even formalized library:

  prettify-symbols-mode

but I interested if ligatures supported by font rendering engines behind
Emacs.

Actually author of FiraCode collect tricks how to achieve similar effect in
Emacs with his font:

  https://github.com/tonsky/FiraCode/wiki/Setting-up-Emacs

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