Fix is_disjoint check for supported environments

crates/uv-resolver/src/requires_python.rs

@@ -127,7 +127,7 @@ impl RequiresPython {
 
     /// Returns the [`RequiresPython`] as a [`MarkerTree`].
     pub fn markers(&self) -> MarkerTree {
-        match (self.range.0.as_ref(), self.range.0.as_ref()) {
+        match (self.range.0.as_ref(), self.range.1.as_ref()) {
             (Bound::Included(lower), Bound::Included(upper)) => {
                 let mut lower = MarkerTree::expression(MarkerExpression::Version {
                     key: MarkerValueVersion::PythonFullVersion,

crates/uv/tests/lock.rs

@@ -11996,3 +11996,117 @@ fn lock_conflicting_environment() -> Result<()> {
 
     Ok(())
 }
+
+#[test]
+fn lock_split_python_environment() -> Result<()> {
+    let context = TestContext::new("3.12");
+
+    let pyproject_toml = context.temp_dir.child("pyproject.toml");
+    pyproject_toml.write_str(
+        r#"
+        [project]
+        name = "foo"
+        version = "0.1.0"
+        requires-python = ">=3.7"
+        dependencies = ["uv ; python_version >= '3.8'"]
+
+        [build-system]
+        requires = ["hatchling"]
+        build-backend = "hatchling.build"
+
+        [tool.uv]
+        environments = ["python_version < '3.8'", "python_version >= '3.8'"]
+        "#,
+    )?;
+
+    uv_snapshot!(context.filters(), context.lock(), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Resolved 2 packages in [TIME]
+    "###);
+
+    let lock = fs_err::read_to_string(context.temp_dir.join("uv.lock")).unwrap();
+
+    insta::with_settings!({
+        filters => context.filters(),
+    }, {
+        assert_snapshot!(
+            lock, @r###"
+        version = 1
+        requires-python = ">=3.7"
+        resolution-markers = [
+            "python_full_version < '3.8'",
+            "python_full_version >= '3.8'",
+        ]
+        supported-markers = [
+            "python_full_version < '3.8'",
+            "python_full_version >= '3.8'",
+        ]
+
+        [options]
+        exclude-newer = "2024-03-25T00:00:00Z"
+
+        [[package]]
+        name = "foo"
+        version = "0.1.0"
+        source = { editable = "." }
+        dependencies = [
+            { name = "uv", marker = "python_full_version >= '3.8'" },
+        ]
+
+        [package.metadata]
+        requires-dist = [{ name = "uv", marker = "python_full_version >= '3.8'" }]
+
+        [[package]]
+        name = "uv"
+        version = "0.1.24"
+        source = { registry = "https://pypi.org/simple" }
+        sdist = { url = "https://files.pythonhosted.org/packages/da/dc/73cc9792f5e5362612bb9fadd1b158f941b7bc9d47016416f36d077b995b/uv-0.1.24.tar.gz", hash = "sha256:1f8abf3330570acbf6188da635c4fe9cc936f9f36b49ce4992a2df56b2155421", size = 598670 }
+        wheels = [
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+        ]
+        "###
+        );
+    });
+
+    // Re-run with `--locked`.
+    uv_snapshot!(context.filters(), context.lock().arg("--locked"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Resolved 2 packages in [TIME]
+    "###);
+
+    // Re-run with `--offline`. We shouldn't need a network connection to validate an
+    // already-correct lockfile with immutable metadata.
+    uv_snapshot!(context.filters(), context.lock().arg("--locked").arg("--offline").arg("--no-cache"), @r###"
+    success: true
+    exit_code: 0
+    ----- stdout -----
+
+    ----- stderr -----
+    Resolved 2 packages in [TIME]
+    "###);
+
+    Ok(())
+}