Fix new beta warnings

diesel/src/connection/mod.rs

@@ -547,6 +547,7 @@ pub(crate) mod private {
 
     // These impls are only there for backward compatibility reasons
     // Remove them on the next breaking release
+    #[allow(unreachable_pub)] // must be pub for the type def using this trait
     #[cfg(all(feature = "with-deprecated", not(feature = "without-deprecated")))]
     pub trait ConnectionHelperType<DB, B>: super::LoadConnection<B, Backend = DB> {
         type Cursor<'conn, 'query>

diesel/src/macros/mod.rs

@@ -4,7 +4,7 @@ pub(crate) mod prelude {
         allow(deprecated)
     )]
     // This is a false positive, we reexport it later
-    #[allow(unreachable_pub)]
+    #[allow(unreachable_pub, unused_imports)]
     #[doc(inline)]
     pub use crate::{
         allow_columns_to_appear_in_same_group_by_clause, allow_tables_to_appear_in_same_query,

diesel/src/query_builder/distinct_clause.rs

@@ -31,6 +31,6 @@ impl<O> ValidOrderingForDistinct<NoDistinctClause> for O {}
 impl<O> ValidOrderingForDistinct<DistinctClause> for O {}
 
 // This is rexported from another location
-#[allow(unreachable_pub)]
+#[allow(unreachable_pub, unused_imports)]
 #[cfg(feature = "postgres_backend")]
 pub use crate::pg::DistinctOnClause;

diesel/src/query_source/aliasing/alias.rs

@@ -207,9 +207,11 @@ where
 /// To be able to define `helper_types::Fields` with the usual conventions
 ///
 /// This type is intentionally not publicly exported
+#[allow(unreachable_pub)]
 pub trait GetAliasSourceFromAlias {
     type Source;
 }
+
 impl<S> GetAliasSourceFromAlias for Alias<S> {
     type Source = S;
 }

diesel/src/row.rs

@@ -265,6 +265,7 @@ pub(crate) mod private {
     // These impls are only there for backward compatibility reasons
     // Remove them on the next breaking release
     #[cfg(all(feature = "with-deprecated", not(feature = "without-deprecated")))]
+    #[allow(unreachable_pub)]
     pub trait RowLifetimeHelper<DB>: for<'a> super::Row<'a, DB>
     where
         DB: Backend,

diesel_tests/tests/types_roundtrip.rs

@@ -5,6 +5,7 @@ pub use quickcheck::quickcheck;
 pub use crate::schema::{connection_without_transaction, TestConnection};
 pub use diesel::data_types::*;
 pub use diesel::result::Error;
+#[cfg(not(feature = "postgres"))]
 pub use diesel::serialize::ToSql;
 pub use diesel::sql_types::{HasSqlType, SingleValue, SqlType};
 pub use diesel::*;