resolve nightly rust warnings

Signed-off-by: strawberry <strawberry@puppygock.gay>

src/api/client_server/unversioned.rs

@@ -1,4 +1,4 @@
-use std::{collections::BTreeMap, iter::FromIterator};
+use std::collections::BTreeMap;
 
 use axum::{response::IntoResponse, Json};
 use ruma::api::client::{discovery::get_supported_versions, error::ErrorKind};

src/api/ruma_wrapper/axum.rs

@@ -1,4 +1,4 @@
-use std::{collections::BTreeMap, iter::FromIterator, str};
+use std::{collections::BTreeMap, str};
 
 use axum::{
     async_trait,

src/database/abstraction.rs

@@ -24,6 +24,8 @@ pub(crate) trait KeyValueDatabaseEngine: Send + Sync {
     fn memory_usage(&self) -> Result<String> {
         Ok("Current database engine does not support memory usage reporting.".to_owned())
     }
+
+    #[allow(dead_code)]
     fn clear_caches(&self) {}
 }
 

src/database/abstraction/rocksdb.rs

@@ -164,6 +164,8 @@ impl KeyValueDatabaseEngine for Arc<Engine> {
         ))
     }
 
+    // TODO: figure out if this is needed for rocksdb
+    #[allow(dead_code)]
     fn clear_caches(&self) {}
 }
 

src/service/admin/mod.rs

@@ -1,6 +1,5 @@
 use std::{
     collections::BTreeMap,
-    convert::{TryFrom, TryInto},
     sync::{Arc, RwLock},
     time::Instant,
 };

src/service/rooms/event_handler/mod.rs

@@ -7,9 +7,9 @@ use ruma::{
     RoomVersionId,
 };
 use std::{
-    collections::{hash_map, BTreeMap, HashMap, HashSet},
+    collections::{hash_map, HashSet},
     pin::Pin,
-    sync::{Arc, RwLock, RwLockWriteGuard},
+    sync::RwLockWriteGuard,
     time::{Duration, Instant, SystemTime},
 };
 use tokio::sync::Semaphore;
@@ -36,7 +36,7 @@ use ruma::{
 use serde_json::value::RawValue as RawJsonValue;
 use tracing::{debug, error, info, trace, warn};
 
-use crate::{service::*, services, Error, PduEvent, Result};
+use crate::{service::*, services, Error, PduEvent};
 
 use super::state_compressor::CompressedStateEvent;