From 5336e4317df3cfb103e9b3c4e528740eda5ed14a Mon Sep 17 00:00:00 2001
From: Kenneth Reitz <me@kennethreitz.org>
Date: Fri, 9 Mar 2018 09:53:50 -0500
Subject: [PATCH] better debugging

Signed-off-by: Kenneth Reitz <me@kennethreitz.org>
---
 pipenv/patched/piptools/repositories/pypi.py | 10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

diff --git a/pipenv/patched/piptools/repositories/pypi.py b/pipenv/patched/piptools/repositories/pypi.py
index cda890e1..350ea0c0 100755
--- a/pipenv/patched/piptools/repositories/pypi.py
+++ b/pipenv/patched/piptools/repositories/pypi.py
@@ -176,7 +176,15 @@ class PyPIRepository(BaseRepository):
         except Exception:
             legacy_results = set()
 
-        return json_results | legacy_results
+        results = json_results | legacy_results
+
+        if not len(results):
+            raise ValueError(
+                'Your dependencies could not be resolved.\n'
+                'Please run "$ pipenv-resolver {0!r} --verbose" to debug.'.format(str(ireq.req))
+            )
+
+        return results
 
     def get_legacy_dependencies(self, ireq):
         """