From 123e61d4a59ac1ce91c54733f4962a272b52a688 Mon Sep 17 00:00:00 2001
From: Pradyun Gedam <pradyunsg@gmail.com>
Date: Wed, 18 Apr 2018 09:39:27 +0530
Subject: [PATCH 1/2] Reorder conditionals to deal with installed VCS
 requirements

---
 src/pip/_internal/wheel.py | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/pip/_internal/wheel.py b/src/pip/_internal/wheel.py
index 170e2bdc517..c71f17d2c8b 100644
--- a/src/pip/_internal/wheel.py
+++ b/src/pip/_internal/wheel.py
@@ -717,11 +717,11 @@ def build(self, requirements, session, autobuilding=False):
                     )
             elif autobuilding and req.editable:
                 pass
+            elif autobuilding and not req.source_dir:
+                pass
             elif autobuilding and req.link and not req.link.is_artifact:
                 # VCS checkout. Build wheel just for this run.
                 buildset.append((req, True))
-            elif autobuilding and not req.source_dir:
-                pass
             else:
                 ephem_cache = False
                 if autobuilding:

From b610eabcc9d04d829cd78ca4e1d40801ee837151 Mon Sep 17 00:00:00 2001
From: Pradyun Gedam <pradyunsg@gmail.com>
Date: Wed, 18 Apr 2018 09:46:42 +0530
Subject: [PATCH 2/2] :newspaper:

---
 news/5251.bugfix | 1 +
 1 file changed, 1 insertion(+)
 create mode 100644 news/5251.bugfix

diff --git a/news/5251.bugfix b/news/5251.bugfix
new file mode 100644
index 00000000000..7bc1b10c71b
--- /dev/null
+++ b/news/5251.bugfix
@@ -0,0 +1 @@
+A crash when reinstalling from VCS requirements has been fixed.