chore: checkpoint before Python removal

vendor/schemars/tests/semver.rs

@@ -0,0 +1,15 @@
+mod util;
+use schemars::JsonSchema;
+use semver::Version;
+use util::*;
+
+#[allow(dead_code)]
+#[derive(JsonSchema)]
+struct SemverTypes {
+    version: Version,
+}
+
+#[test]
+fn semver_types() -> TestResult {
+    test_default_generated_schema::<SemverTypes>("semver")
+}