From e19cceab869a67d876cbb807626b605f778cbc0f Mon Sep 17 00:00:00 2001
From: Giacomo Leidi <goodoldpaul@autistici.org>
Date: Tue, 9 Jun 2020 19:06:02 +0200
Subject: [PATCH 4/9] gnu: Add python-mypy-extensions.

* gnu/packages/python-xyz.scm (python-mypy-extensions): New variable.
---
 gnu/packages/python-xyz.scm | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/gnu/packages/python-xyz.scm b/gnu/packages/python-xyz.scm
index 1d51128090..82c3a21913 100644
--- a/gnu/packages/python-xyz.scm
+++ b/gnu/packages/python-xyz.scm
@@ -22563,3 +22563,25 @@ applications with variable CPU loads).")
     (description "@code{python-aiofiles} is a library for handling local
 disk files in asyncio applications.")
     (license license:asl2.0)))
+
+(define-public python-mypy-extensions
+  (package
+    (name "python-mypy-extensions")
+    (version "0.4.3")
+    (source
+     (origin
+       (method url-fetch)
+       (uri (pypi-uri "mypy-extensions" version))
+       (sha256
+        (base32
+         "1a04qsk8hd1lqns8w1j7cr0vmvbhg450di5k1i16kqxkbf7q30id"))))
+    (build-system python-build-system)
+    (home-page
+     "https://github.com/python/mypy_extensions")
+    (synopsis
+     "Experimental type system extensions for mypy")
+    (description
+     "@code{python-mypy-extensions} defines experimental extensions
+to the standard @code{typing} module that are supported by the
+@code{mypy} typechecker.")
+    (license license:expat)))
-- 
2.28.0