From b257d137ae2bcf1ef2e188f20e60f3ca5770e090 Mon Sep 17 00:00:00 2001
From: "Jason R. Coombs" <jaraco@jaraco.com>
Date: Sun, 6 Feb 2022 12:43:29 -0500
Subject: In egg_info, port use of pkg_resources.EntryPoint to
 importlib.metadata

---
 setuptools/_itertools.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)
 create mode 100644 setuptools/_itertools.py

(limited to 'setuptools/_itertools.py')

diff --git a/setuptools/_itertools.py b/setuptools/_itertools.py
new file mode 100644
index 00000000..b8bf6d21
--- /dev/null
+++ b/setuptools/_itertools.py
@@ -0,0 +1,23 @@
+from setuptools.extern.more_itertools import consume  # noqa: F401
+
+
+# copied from jaraco.itertools 6.1
+def ensure_unique(iterable, key=lambda x: x):
+    """
+    Wrap an iterable to raise a ValueError if non-unique values are encountered.
+
+    >>> list(ensure_unique('abc'))
+    ['a', 'b', 'c']
+    >>> consume(ensure_unique('abca'))
+    Traceback (most recent call last):
+    ...
+    ValueError: Duplicate element 'a' encountered.
+    """
+    seen = set()
+    seen_add = seen.add
+    for element in iterable:
+        k = key(element)
+        if k in seen:
+            raise ValueError(f"Duplicate element {element!r} encountered.")
+        seen_add(k)
+        yield element
-- 
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