rekahsoft-gnu: Add emacs-lsp-haskell

* rekahsoft-gnu/packages/emacs-xyz.scm (emacs-lsp-haskell): New variable.

rekahsoft-gnu/packages/emacs-xyz.scm

@@ -987,3 +987,22 @@ try @code{emacs-ledger-mode}.")
     (description
       "This package is a flycheck checker for hledger files.")
     (license license:gpl3)))
+
+(define-public emacs-lsp-haskell
+  (package
+    (name "emacs-lsp-haskell")
+    (version "20220307.2312")
+    (source (origin
+              (method git-fetch)
+              (uri (git-reference
+                    (url "https://github.com/emacs-lsp/lsp-haskell.git")
+                    (commit "daa51072e1718ca075987901fccbbc2357bca1fc")))
+              (sha256
+               (base32
+                "0d2myk2906j0ngivca1yf4vdi8bfk5pz706nx279bf0pil7irdy0"))))
+    (build-system emacs-build-system)
+    (propagated-inputs (list emacs-lsp-mode))
+    (home-page "https://github.com/emacs-lsp/lsp-haskell")
+    (synopsis "Haskell support for lsp-mode")
+    (description "Haskell specific adapter for LSP mode")
+    (license license:gpl3)))