fix(#3445): PgHasArrayType (#3453)

* fix(#3445): PgHasArrayType

* regression test for custom no_pg_array

sqlx-macros-core/src/derives/attributes.rs

@@ -278,12 +278,6 @@ pub fn check_struct_attributes(
         input
     );
 
-    assert_attribute!(
-        !attributes.no_pg_array,
-        "unused #[sqlx(no_pg_array)]; derive does not emit `PgHasArrayType` impls for custom structs",
-        input
-    );
-
     assert_attribute!(attributes.repr.is_none(), "unexpected #[repr(..)]", input);
 
     for field in fields {

tests/postgres/derives.rs

@@ -1,6 +1,7 @@
 use futures::TryStreamExt;
 use sqlx::postgres::types::PgRange;
 use sqlx::{Connection, Executor, FromRow, Postgres};
+use sqlx_postgres::PgHasArrayType;
 use sqlx_test::{new, test_type};
 use std::fmt::Debug;
 use std::ops::Bound;
@@ -792,3 +793,20 @@ async fn test_from_row_hygiene() -> anyhow::Result<()> {
 
     Ok(())
 }
+
+#[sqlx_macros::test]
+async fn test_custom_pg_array() -> anyhow::Result<()> {
+    #[derive(sqlx::Type)]
+    #[sqlx(no_pg_array)]
+    pub struct User {
+        pub id: i32,
+        pub username: String,
+    }
+
+    impl PgHasArrayType for User {
+        fn array_type_info() -> sqlx::postgres::PgTypeInfo {
+            sqlx::postgres::PgTypeInfo::array_of("Gebruiker")
+        }
+    }
+    Ok(())
+}