fixup! build_meta: produce informative error when a dist is not found

1 files changed, 4 insertions, 2 deletions

diff --git a/setuptools/build_meta.py b/setuptools/build_meta.py
index 36fbc9e8..de856854 100644
--- a/setuptools/build_meta.py
+++ b/setuptools/build_meta.py
@@ -102,11 +102,13 @@ def _file_with_extension(directory, extension):
         if f.endswith(extension)
     )
     try:
-        return next(matching)
-    except StopIteration:
+        file, = matching
+    except ValueError:
         raise ValueError(
             'No distribution was found. Ensure that `setup.py` '
             'is not empty and that it calls `setup()`.')
+    else:
+        return file
 
 
 def _open_setup_script(setup_script):