Filter out yanked links from available versions error message

Author: ddelange

news/12225.bugfix.rst

@@ -0,0 +1 @@
+Filter out yanked links from the available versions error message: "(from versions: 1.0, 2.0, 3.0)" will not contain yanked versions conform PEP 592.

src/pip/_internal/resolution/resolvelib/factory.py

@@ -603,7 +603,9 @@ def _report_single_requirement_conflict(
 
         cands = self._finder.find_all_candidates(req.project_name)
         skipped_by_requires_python = self._finder.requires_python_skipped_reasons()
-        versions = [str(v) for v in sorted({c.version for c in cands})]
+        versions = [
+            str(v) for v in sorted({c.version for c in cands if not c.link.is_yanked})
+        ]
 
         if skipped_by_requires_python:
             logger.critical(

tests/functional/test_install.py

@@ -2242,6 +2242,27 @@ def test_install_yanked_file_and_print_warning(
     assert "Successfully installed simple-3.0\n" in result.stdout, str(result)
 
 
+def test_yanked_version_missing_from_availble_versions_error_message(
+    script: PipTestEnvironment, data: TestData
+) -> None:
+    """
+    Test yanked version is missing from available versions error message.
+
+    Yanked files are always ignored, unless they are the only file that
+    matches a version specifier that "pins" to an exact version (PEP 592).
+    """
+    result = script.pip(
+        "install",
+        "simple==",
+        "--index-url",
+        data.index_url("yanked"),
+        expect_stderr=True,
+    )
+    # the yanked version (3.0) is filtered out from the output:
+    expected_warning = "Could not find a version that satisfies the requirement simple== (from versions: 1.0, 2.0)"
+    assert expected_warning in result.stderr, str(result)
+
+
 def test_error_all_yanked_files_and_no_pin(
     script: PipTestEnvironment, data: TestData
 ) -> None: