Enable eriving JsonSchema when fields are in remote crates

schemars/tests/remote_derive.rs

@@ -0,0 +1,37 @@
+mod util;
+
+use other_crate::Duration;
+use schemars::JsonSchema;
+use util::*;
+
+mod other_crate {
+    #[derive(Debug)]
+    pub struct Duration {
+        pub secs: i64,
+        pub nanos: i32,
+    }
+}
+
+#[derive(Debug, JsonSchema)]
+#[serde(remote = "Duration")]
+struct DurationDef {
+    secs: i64,
+    nanos: i32,
+}
+
+#[derive(Debug, JsonSchema)]
+struct Process {
+    command_line: String,
+    #[serde(with = "DurationDef")]
+    wall_time: Duration,
+    #[serde(with = "DurationDef")]
+    user_cpu_time: Duration,
+    #[serde(deserialize_with = "some_serialize_function")]
+    #[schemars(with = "DurationDef")]
+    system_cpu_time: Duration,
+}
+
+#[test]
+fn remote_derive_json_schema() -> TestResult {
+    test_default_generated_schema::<Process>("remote_derive")
+}