add attribute try_from

test_suite/tests/ui/transparent/with_try_from.rs

@@ -0,0 +1,9 @@
+use serde_derive::Serialize;
+
+#[derive(Serialize)]
+#[serde(transparent, try_from = "u64")]
+struct S {
+    a: u8,
+}
+
+fn main() {}