Warn of unknown version range options

conans/model/version_range.py

@@ -94,6 +94,13 @@ def __init__(self, expression):
             if "include_prerelease" in t:
                 prereleases = True
                 break
+            else:
+                t = t.strip()
+                if len(t) > 0 and t[0].isalpha():
+                    from conan.api.output import ConanOutput
+                    ConanOutput().warning(f'Unrecognized version range option "{t}" in "{expression}"')
+                else:
+                    raise ConanException(f'"{t}" in version range "{expression}" is not a valid option')
         version_expr = tokens[0]
         self.condition_sets = []
         for alternative in version_expr.split("||"):

conans/test/integration/graph/core/test_version_ranges.py

@@ -414,3 +414,15 @@ def test_different_user_channel_resolved_correctly():
     client2.run("install --requires=lib/[>=1.0]@conan/testing")
     assert f"lib/1.0@conan/testing: Retrieving package {NO_SETTINGS_PACKAGE_ID} " \
            f"from remote 'server2' " in client2.out
+
+
+def test_unknown_options():
+    c = TestClient()
+    c.save({"conanfile.py": GenConanfile("lib", "2.0")})
+    c.run("create .")
+
+    c.run("graph info --requires=lib/[>1.2,<1.4]", assert_error=True)
+    assert '"<1.4" in version range ">1.2,<1.4" is not a valid option' in c.out
+
+    c.run("graph info --requires=lib/[>1.2,unknown_conf]")
+    assert 'WARN: Unrecognized version range option "unknown_conf" in ">1.2,unknown_conf"' in c.out

conans/test/integration/py_requires/python_requires_test.py

@@ -114,7 +114,7 @@ def test_reuse_version_ranges(self):
         reuse = textwrap.dedent("""
             from conan import ConanFile
             class PkgTest(ConanFile):
-                python_requires = "base/[>1.0,<1.2]@user/testing"
+                python_requires = "base/[>1.0 <1.2]@user/testing"
                 python_requires_extend = "base.MyConanfileBase"
             """)