src/entity/gateway/inmemory.rs

@@ -168,7 +168,8 @@ impl EntityGateway for InMemoryGateway {
 
     async fn get_characters_by_user(&self, user: &UserAccountEntity) -> Result<[Option<CharacterEntity>; 4], GatewayError> {
         let characters = self.characters.lock().unwrap();
-        let mut chars = [None; 4];
+        const NONE: Option<CharacterEntity> = None;
+        let mut chars = [NONE; 4];
         characters
             .iter()
             .filter(|(_, c)| c.user_id == user.id)

src/entity/gateway/postgres/postgres.rs

@@ -229,7 +229,8 @@ impl EntityGateway for PostgresGateway {
         let mut stream = sqlx::query_as::<_, PgCharacter>("select * from player_character where user_account = $1 and slot < 4 order by slot")
             .bind(user.id.0)
             .fetch(&self.pool);
-        let mut result = [None; 4];
+        const NONE: Option<CharacterEntity> = None;
+        let mut result = [NONE; 4];
         while let Some(character) = stream.try_next().await? {
             let index = character.slot as usize;
             result[index] = Some(character.into())

src/lib.rs

@@ -1,7 +1,7 @@
 #![allow(incomplete_features)]
 #![feature(const_generics)]
 #![feature(maybe_uninit_extra)]
-#![feature(const_in_array_repeat_expressions)]
+#![feature(inline_const)]
 #![feature(drain_filter)]
 #![feature(or_patterns)]