We are currently solving the following issue within our repository. Here is the issue text:
--- BEGIN ISSUE ---
[TODO][CI][pip upstream changes] Fix failing nightlies running against `pip`'s `main` branch
Failure example: https://github.com/jazzband/pip-tools/actions/runs/8794562108/job/24134206791

--- END ISSUE ---

Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
--- BEGIN FILES ---
Path: `piptools/exceptions.py`
Content:
```
1 from __future__ import annotations
2 
3 from typing import Iterable
4 
5 from pip._internal.index.package_finder import PackageFinder
6 from pip._internal.models.candidate import InstallationCandidate
7 from pip._internal.req import InstallRequirement
8 from pip._internal.utils.misc import redact_auth_from_url
9 
10 
11 class PipToolsError(Exception):
12     pass
13 
14 
15 class NoCandidateFound(PipToolsError):
16     def __init__(
17         self,
18         ireq: InstallRequirement,
19         candidates_tried: Iterable[InstallationCandidate],
20         finder: PackageFinder,
21     ) -> None:
22         self.ireq = ireq
23         self.candidates_tried = candidates_tried
24         self.finder = finder
25 
26     def __str__(self) -> str:
27         versions = []
28         pre_versions = []
29 
30         for candidate in sorted(self.candidates_tried):
31             version = str(candidate.version)
32             if candidate.version.is_prerelease:
33                 pre_versions.append(version)
34             else:
35                 versions.append(version)
36 
37         lines = [f"Could not find a version that matches {self.ireq}"]
38 
39         if versions:
40             lines.append(f"Tried: {', '.join(versions)}")
41 
42         if pre_versions:
43             if self.finder.allow_all_prereleases:
44                 line = "Tried"
45             else:
46                 line = "Skipped"
47 
48             line += f" pre-versions: {', '.join(pre_versions)}"
49             lines.append(line)
50 
51         if versions or pre_versions:
52             lines.append(
53                 "There are incompatible versions in the resolved dependencies:"
54             )
55             source_ireqs = getattr(self.ireq, "_source_ireqs", [])
56             lines.extend(f"  {ireq}" for ireq in source_ireqs)
57         else:
58             redacted_urls = tuple(
59                 redact_auth_from_url(url) for url in self.finder.index_urls
60             )
61             lines.append("No versions found")
62             lines.append(
63                 "{} {} reachable?".format(
64                     "Were" if len(redacted_urls) > 1 else "Was",
65                     " or ".join(redacted_urls),
66                 )
67             )
68         return "\n".join(lines)
69 
70 
71 class IncompatibleRequirements(PipToolsError):
72     def __init__(self, ireq_a: InstallRequirement, ireq_b: InstallRequirement) -> None:
73         self.ireq_a = ireq_a
74         self.ireq_b = ireq_b
75 
76     def __str__(self) -> str:
77         message = "Incompatible requirements found: {} and {}"
78         return message.format(self.ireq_a, self.ireq_b)
79
```
--- END FILES ---

Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.

Here is an example:

```diff
diff --git a/examples/server_async.py b/examples/server_async.py
--- a/examples/server_async.py
+++ b/examples/server_async.py
@@ -313,4 +313,4 @@
 
 
 if __name__ == "__main__":
-    asyncio.run(run_async_server("."), debug=True)
+    asyncio.run(run_async_server(), debug=True)
diff --git a/examples/server_sync.py b/examples/server_sync.py
--- a/examples/server_sync.py
+++ b/examples/server_sync.py
@@ -313,5 +313,5 @@
 
 
 if __name__ == "__main__":
-    server = run_sync_server(".")
+    server = run_sync_server()
     server.shutdown()

```

diff --git a/piptools/exceptions.py b/piptools/exceptions.py
--- a/piptools/exceptions.py
+++ b/piptools/exceptions.py
@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import operator
 from typing import Iterable
 
 from pip._internal.index.package_finder import PackageFinder
@@ -27,7 +28,9 @@
         versions = []
         pre_versions = []
 
-        for candidate in sorted(self.candidates_tried):
+        for candidate in sorted(
+            self.candidates_tried, key=operator.attrgetter("version")
+        ):
             version = str(candidate.version)
             if candidate.version.is_prerelease:
                 pre_versions.append(version)

{"golden_diff": "diff --git a/piptools/exceptions.py b/piptools/exceptions.py\n--- a/piptools/exceptions.py\n+++ b/piptools/exceptions.py\n@@ -1,5 +1,6 @@\n from __future__ import annotations\n \n+import operator\n from typing import Iterable\n \n from pip._internal.index.package_finder import PackageFinder\n@@ -27,7 +28,9 @@\n         versions = []\n         pre_versions = []\n \n-        for candidate in sorted(self.candidates_tried):\n+        for candidate in sorted(\n+            self.candidates_tried, key=operator.attrgetter(\"version\")\n+        ):\n             version = str(candidate.version)\n             if candidate.version.is_prerelease:\n                 pre_versions.append(version)\n", "issue": "[TODO][CI][pip upstream changes] Fix failing nightlies running against `pip`'s `main` branch\nFailure example: https://github.com/jazzband/pip-tools/actions/runs/8794562108/job/24134206791\n", "before_files": [{"content": "from __future__ import annotations\n\nfrom typing import Iterable\n\nfrom pip._internal.index.package_finder import PackageFinder\nfrom pip._internal.models.candidate import InstallationCandidate\nfrom pip._internal.req import InstallRequirement\nfrom pip._internal.utils.misc import redact_auth_from_url\n\n\nclass PipToolsError(Exception):\n    pass\n\n\nclass NoCandidateFound(PipToolsError):\n    def __init__(\n        self,\n        ireq: InstallRequirement,\n        candidates_tried: Iterable[InstallationCandidate],\n        finder: PackageFinder,\n    ) -> None:\n        self.ireq = ireq\n        self.candidates_tried = candidates_tried\n        self.finder = finder\n\n    def __str__(self) -> str:\n        versions = []\n        pre_versions = []\n\n        for candidate in sorted(self.candidates_tried):\n            version = str(candidate.version)\n            if candidate.version.is_prerelease:\n                pre_versions.append(version)\n            else:\n                versions.append(version)\n\n        lines = [f\"Could not find a version that matches {self.ireq}\"]\n\n        if versions:\n            lines.append(f\"Tried: {', '.join(versions)}\")\n\n        if pre_versions:\n            if self.finder.allow_all_prereleases:\n                line = \"Tried\"\n            else:\n                line = \"Skipped\"\n\n            line += f\" pre-versions: {', '.join(pre_versions)}\"\n            lines.append(line)\n\n        if versions or pre_versions:\n            lines.append(\n                \"There are incompatible versions in the resolved dependencies:\"\n            )\n            source_ireqs = getattr(self.ireq, \"_source_ireqs\", [])\n            lines.extend(f\"  {ireq}\" for ireq in source_ireqs)\n        else:\n            redacted_urls = tuple(\n                redact_auth_from_url(url) for url in self.finder.index_urls\n            )\n            lines.append(\"No versions found\")\n            lines.append(\n                \"{} {} reachable?\".format(\n                    \"Were\" if len(redacted_urls) > 1 else \"Was\",\n                    \" or \".join(redacted_urls),\n                )\n            )\n        return \"\\n\".join(lines)\n\n\nclass IncompatibleRequirements(PipToolsError):\n    def __init__(self, ireq_a: InstallRequirement, ireq_b: InstallRequirement) -> None:\n        self.ireq_a = ireq_a\n        self.ireq_b = ireq_b\n\n    def __str__(self) -> str:\n        message = \"Incompatible requirements found: {} and {}\"\n        return message.format(self.ireq_a, self.ireq_b)\n", "path": "piptools/exceptions.py"}], "after_files": [{"content": "from __future__ import annotations\n\nimport operator\nfrom typing import Iterable\n\nfrom pip._internal.index.package_finder import PackageFinder\nfrom pip._internal.models.candidate import InstallationCandidate\nfrom pip._internal.req import InstallRequirement\nfrom pip._internal.utils.misc import redact_auth_from_url\n\n\nclass PipToolsError(Exception):\n    pass\n\n\nclass NoCandidateFound(PipToolsError):\n    def __init__(\n        self,\n        ireq: InstallRequirement,\n        candidates_tried: Iterable[InstallationCandidate],\n        finder: PackageFinder,\n    ) -> None:\n        self.ireq = ireq\n        self.candidates_tried = candidates_tried\n        self.finder = finder\n\n    def __str__(self) -> str:\n        versions = []\n        pre_versions = []\n\n        for candidate in sorted(\n            self.candidates_tried, key=operator.attrgetter(\"version\")\n        ):\n            version = str(candidate.version)\n            if candidate.version.is_prerelease:\n                pre_versions.append(version)\n            else:\n                versions.append(version)\n\n        lines = [f\"Could not find a version that matches {self.ireq}\"]\n\n        if versions:\n            lines.append(f\"Tried: {', '.join(versions)}\")\n\n        if pre_versions:\n            if self.finder.allow_all_prereleases:\n                line = \"Tried\"\n            else:\n                line = \"Skipped\"\n\n            line += f\" pre-versions: {', '.join(pre_versions)}\"\n            lines.append(line)\n\n        if versions or pre_versions:\n            lines.append(\n                \"There are incompatible versions in the resolved dependencies:\"\n            )\n            source_ireqs = getattr(self.ireq, \"_source_ireqs\", [])\n            lines.extend(f\"  {ireq}\" for ireq in source_ireqs)\n        else:\n            redacted_urls = tuple(\n                redact_auth_from_url(url) for url in self.finder.index_urls\n            )\n            lines.append(\"No versions found\")\n            lines.append(\n                \"{} {} reachable?\".format(\n                    \"Were\" if len(redacted_urls) > 1 else \"Was\",\n                    \" or \".join(redacted_urls),\n                )\n            )\n        return \"\\n\".join(lines)\n\n\nclass IncompatibleRequirements(PipToolsError):\n    def __init__(self, ireq_a: InstallRequirement, ireq_b: InstallRequirement) -> None:\n        self.ireq_a = ireq_a\n        self.ireq_b = ireq_b\n\n    def __str__(self) -> str:\n        message = \"Incompatible requirements found: {} and {}\"\n        return message.format(self.ireq_a, self.ireq_b)\n", "path": "piptools/exceptions.py"}]}