Fix Rust beta compiler errors 1.78.0-beta.1 (#5439)

* remove redundant imports

* fix test

* contains key

* fmt

* Merge branch 'unstable' into fix-beta-compiler

watch/src/database/compat.rs

@@ -5,8 +5,6 @@ use diesel::pg::{Pg, PgValue};
 use diesel::serialize::{self, Output, ToSql};
 use diesel::sql_types::{Binary, Integer};
 
-use std::convert::TryFrom;
-
 macro_rules! impl_to_from_sql_int {
     ($type:ty) => {
         impl ToSql<Integer, Pg> for $type

watch/src/database/mod.rs

@@ -13,7 +13,6 @@ use self::schema::{
 };
 
 use diesel::dsl::max;
-use diesel::pg::PgConnection;
 use diesel::prelude::*;
 use diesel::r2d2::{Builder, ConnectionManager, Pool, PooledConnection};
 use diesel::upsert::excluded;

watch/src/database/utils.rs

@@ -1,6 +1,5 @@
 #![allow(dead_code)]
 use crate::database::config::Config;
-use diesel::pg::PgConnection;
 use diesel::prelude::*;
 use diesel_migrations::{FileBasedMigrations, MigrationHarness};