haskell layer: fix haskell-snippets loading

fixes syl20bnr#1471

contrib/lang/haskell/packages.el

@@ -183,8 +183,17 @@
       (add-hook 'evil-emacs-state-exit-hook 'spacemacs//haskell-indentation-hide-guides))))
 
 (defun haskell/init-haskell-snippets ()
-  (use-package haskell-snippets
-    :defer t))
+  ;; manually load the package since the current implementation is not lazy
+  ;; loading friendly (funny coming from the haskell mode :-))
+  (setq haskell-snippets-dir (spacemacs//get-package-directory
+                              'haskell-snippets))
+
+  (defun haskell-snippets-initialize ()
+    (let ((snip-dir (expand-file-name "snippets" haskell-snippets-dir)))
+      (add-to-list 'yas-snippet-dirs snip-dir t)
+      (yas-load-directory snip-dir)))
+
+  (eval-after-load 'yasnippet '(haskell-snippets-initialize)))
 
 (defun haskell/init-hindent ()
   (use-package hindent