diff --git a/contrib/sync_db_pools/lib/tests/databases.rs b/contrib/sync_db_pools/lib/tests/databases.rs
index 0bccbc56..3219a481 100644
--- a/contrib/sync_db_pools/lib/tests/databases.rs
+++ b/contrib/sync_db_pools/lib/tests/databases.rs
@@ -1,6 +1,8 @@
 #[cfg(all(feature = "diesel_sqlite_pool", feature = "diesel_postgres_pool"))]
 mod databases_tests {
-    use rocket_sync_db_pools::{database, diesel};
+    #![allow(dead_code)]
+
+    use rocket_sync_db_pools::database;
 
     #[database("example")]
     struct ExampleDb(diesel::SqliteConnection);
diff --git a/contrib/sync_db_pools/lib/tests/shutdown.rs b/contrib/sync_db_pools/lib/tests/shutdown.rs
index d338862e..d21e6f87 100644
--- a/contrib/sync_db_pools/lib/tests/shutdown.rs
+++ b/contrib/sync_db_pools/lib/tests/shutdown.rs
@@ -5,6 +5,7 @@ mod sqlite_shutdown_test {
     use rocket_sync_db_pools::database;
 
     #[database("test")]
+    #[allow(dead_code)]
     struct Pool(diesel::SqliteConnection);
 
     async fn rocket() -> Rocket<Build> {
diff --git a/core/codegen/src/bang/test_guide.rs b/core/codegen/src/bang/test_guide.rs
index faa9b560..cfbfc124 100644
--- a/core/codegen/src/bang/test_guide.rs
+++ b/core/codegen/src/bang/test_guide.rs
@@ -1,7 +1,7 @@
 use std::path::Path;
 use std::error::Error;
 
-use syn::{self, Ident, LitStr};
+use syn::{Ident, LitStr};
 use devise::ext::SpanDiagnosticExt;
 use proc_macro2::TokenStream;
 
diff --git a/core/codegen/src/name.rs b/core/codegen/src/name.rs
index c3a2521b..c5b8e2b1 100644
--- a/core/codegen/src/name.rs
+++ b/core/codegen/src/name.rs
@@ -1,6 +1,6 @@
 use crate::http::uncased::UncasedStr;
 
-use syn::{self, Ident, ext::IdentExt};
+use syn::{Ident, ext::IdentExt};
 use proc_macro2::{Span, TokenStream};
 
 /// A "name" read by codegen, which may or may not be an identifier. A `Name` is
diff --git a/core/codegen/src/syn_ext.rs b/core/codegen/src/syn_ext.rs
index 608a914c..73ab6166 100644
--- a/core/codegen/src/syn_ext.rs
+++ b/core/codegen/src/syn_ext.rs
@@ -4,7 +4,7 @@ use std::ops::Deref;
 use std::hash::{Hash, Hasher};
 use std::borrow::Cow;
 
-use syn::{self, Ident, ext::IdentExt as _, visit::Visit};
+use syn::{Ident, ext::IdentExt as _, visit::Visit};
 use proc_macro2::{Span, TokenStream};
 use devise::ext::{PathExt, TypeExt as _};
 use rocket_http::ext::IntoOwned;
@@ -21,17 +21,12 @@ pub trait ReturnTypeExt {
     fn ty(&self) -> Option<&syn::Type>;
 }
 
-pub trait TokenStreamExt {
-    fn respanned(&self, span: Span) -> Self;
-}
-
 pub trait FnArgExt {
     fn typed(&self) -> Option<(&syn::Ident, &syn::Type)>;
     fn wild(&self) -> Option<&syn::PatWild>;
 }
 
 pub trait TypeExt {
-    fn unfold(&self) -> Vec<Child<'_>>;
     fn unfold_with_ty_macros(&self, names: &[&str], mapper: MacTyMapFn) -> Vec<Child<'_>>;
     fn is_concrete(&self, generic_ident: &[&Ident]) -> bool;
 }
@@ -112,15 +107,6 @@ impl ReturnTypeExt for syn::ReturnType {
     }
 }
 
-impl TokenStreamExt for TokenStream {
-    fn respanned(&self, span: Span) -> Self {
-        self.clone().into_iter().map(|mut token| {
-            token.set_span(span);
-            token
-        }).collect()
-    }
-}
-
 impl FnArgExt for syn::FnArg {
     fn typed(&self) -> Option<(&Ident, &syn::Type)> {
         match self {
@@ -154,10 +140,6 @@ fn macro_inner_ty(t: &syn::TypeMacro, names: &[&str], m: MacTyMapFn) -> Option<s
 }
 
 impl TypeExt for syn::Type {
-    fn unfold(&self) -> Vec<Child<'_>> {
-        self.unfold_with_ty_macros(&[], |_| None)
-    }
-
     fn unfold_with_ty_macros(&self, names: &[&str], mapper: MacTyMapFn) -> Vec<Child<'_>> {
         struct Visitor<'a, 'm> {
             parents: Vec<Cow<'a, syn::Type>>,
@@ -240,10 +222,10 @@ impl GenericsExt for syn::Generics {
 mod tests {
     #[test]
     fn test_type_unfold_is_generic() {
-        use super::{TypeExt, syn};
+        use super::TypeExt;
 
         let ty: syn::Type = syn::parse_quote!(A<B, C<impl Foo>, Box<dyn Foo>, Option<T>>);
-        let children = ty.unfold();
+        let children = ty.unfold_with_ty_macros(&[], |_| None);
         assert_eq!(children.len(), 8);
 
         let gen_ident = format_ident!("T");
diff --git a/core/http/src/method.rs b/core/http/src/method.rs
index a959fbc2..11e031d4 100644
--- a/core/http/src/method.rs
+++ b/core/http/src/method.rs
@@ -135,7 +135,6 @@ impl fmt::Display for Method {
 
 #[cfg(feature = "serde")]
 mod serde {
-    use std::fmt;
     use super::*;
 
     use serde_::ser::{Serialize, Serializer};
diff --git a/core/http/src/parse/uri/tests.rs b/core/http/src/parse/uri/tests.rs
index ac7b506c..1f37c604 100644
--- a/core/http/src/parse/uri/tests.rs
+++ b/core/http/src/parse/uri/tests.rs
@@ -1,4 +1,3 @@
-use crate::uri::{Origin, Authority, Absolute, Asterisk};
 use crate::parse::uri::*;
 
 macro_rules! assert_parse_eq {
diff --git a/core/http/src/raw_str.rs b/core/http/src/raw_str.rs
index 02a54e3b..fbc2dd77 100644
--- a/core/http/src/raw_str.rs
+++ b/core/http/src/raw_str.rs
@@ -1,14 +1,13 @@
+use std::fmt;
 use std::borrow::{Borrow, Cow};
-use std::convert::AsRef;
 use std::cmp::Ordering;
 use std::str::Utf8Error;
-use std::fmt;
 
 use ref_cast::RefCast;
 use stable_pattern::{Pattern, Searcher, ReverseSearcher, Split, SplitInternal};
-use crate::uri::fmt::{DEFAULT_ENCODE_SET, percent_encode, percent_encode_bytes};
 
 use crate::uncased::UncasedStr;
+use crate::uri::fmt::{DEFAULT_ENCODE_SET, percent_encode, percent_encode_bytes};
 
 /// A reference to a string inside of a raw HTTP message.
 ///
diff --git a/core/http/src/status.rs b/core/http/src/status.rs
index 5518621d..5de8e50e 100644
--- a/core/http/src/status.rs
+++ b/core/http/src/status.rs
@@ -382,7 +382,6 @@ impl Ord for Status {
 
 #[cfg(feature = "serde")]
 mod serde {
-    use std::fmt;
     use super::*;
 
     use serde_::ser::{Serialize, Serializer};
diff --git a/core/lib/src/form/form.rs b/core/lib/src/form/form.rs
index 848d490d..bcb2a241 100644
--- a/core/lib/src/form/form.rs
+++ b/core/lib/src/form/form.rs
@@ -4,8 +4,7 @@ use crate::Request;
 use crate::outcome::try_outcome;
 use crate::data::{Data, FromData, Outcome};
 use crate::http::{RawStr, ext::IntoOwned};
-use crate::form::{SharedStack, parser::{Parser, RawStrParser}};
-use crate::form::prelude::*;
+use crate::form::prelude::{*, parser::{Parser, RawStrParser}};
 
 /// A data guard for [`FromForm`] types.
 ///
diff --git a/core/lib/src/form/parser.rs b/core/lib/src/form/parser.rs
index 4b5fe0a7..1a93d74e 100644
--- a/core/lib/src/form/parser.rs
+++ b/core/lib/src/form/parser.rs
@@ -3,8 +3,8 @@ use either::Either;
 
 use crate::request::{Request, local_cache_once};
 use crate::data::{Data, Limits, Outcome};
-use crate::form::{SharedStack, prelude::*};
 use crate::http::{RawStr, Status};
+use crate::form::prelude::*;
 
 type Result<'r, T> = std::result::Result<T, Error<'r>>;
 
diff --git a/core/lib/src/sentinel.rs b/core/lib/src/sentinel.rs
index df503c31..02d17546 100644
--- a/core/lib/src/sentinel.rs
+++ b/core/lib/src/sentinel.rs
@@ -447,7 +447,6 @@ pub mod resolution {
 #[cfg(test)]
 mod test {
     use std::any::TypeId;
-    use crate::sentinel::resolve;
 
     struct NotASentinel;
     struct YesASentinel;
diff --git a/core/lib/src/shield/policy.rs b/core/lib/src/shield/policy.rs
index 3ac3bc79..29b493c2 100644
--- a/core/lib/src/shield/policy.rs
+++ b/core/lib/src/shield/policy.rs
@@ -7,7 +7,7 @@ use indexmap::IndexMap;
 use rocket_http::{ext::IntoCollection, private::SmallVec};
 use time::Duration;
 
-use crate::http::{Header, uri::Absolute, uncased::{UncasedStr, Uncased}};
+use crate::http::{Header, uri::Absolute, uncased::Uncased};
 
 /// Trait implemented by security and privacy policy headers.
 ///
@@ -64,22 +64,6 @@ pub trait Policy: Default + Send + Sync + 'static {
     fn header(&self) -> Header<'static>;
 }
 
-/// Hack to make `Policy` Object-Safe.
-pub(crate) trait SubPolicy: Send + Sync {
-    fn name(&self) -> &'static UncasedStr;
-    fn header(&self) -> Header<'static>;
-}
-
-impl<P: Policy> SubPolicy for P {
-    fn name(&self) -> &'static UncasedStr {
-        P::NAME.into()
-    }
-
-    fn header(&self) -> Header<'static> {
-        Policy::header(self)
-    }
-}
-
 macro_rules! impl_policy {
     ($T:ty, $name:expr) => (
         impl Policy for $T {
diff --git a/core/lib/tests/derive-reexports.rs b/core/lib/tests/derive-reexports.rs
index 2f719f8f..0c8cde9e 100644
--- a/core/lib/tests/derive-reexports.rs
+++ b/core/lib/tests/derive-reexports.rs
@@ -1,5 +1,3 @@
-use rocket;
-
 use rocket::{get, routes};
 use rocket::form::{FromForm, FromFormField};
 use rocket::response::Responder;
diff --git a/core/lib/tests/forward-includes-status-1560.rs b/core/lib/tests/forward-includes-status-1560.rs
index b325672a..f5b8190d 100644
--- a/core/lib/tests/forward-includes-status-1560.rs
+++ b/core/lib/tests/forward-includes-status-1560.rs
@@ -56,9 +56,10 @@ fn catcher() -> &'static str {
 
 mod tests {
     use super::*;
+
     use rocket::routes;
     use rocket::local::blocking::Client;
-    use rocket::http::{Header, Status};
+    use rocket::http::Header;
 
     #[test]
     fn authorized_forwards() {
diff --git a/core/lib/tests/head_handling.rs b/core/lib/tests/head_handling.rs
index 367d212a..330ddc2c 100644
--- a/core/lib/tests/head_handling.rs
+++ b/core/lib/tests/head_handling.rs
@@ -23,7 +23,7 @@ mod head_handling_tests {
 
     use rocket::Route;
     use rocket::local::blocking::Client;
-    use rocket::http::{Status, ContentType};
+    use rocket::http::ContentType;
 
     fn routes() -> Vec<Route> {
         routes![index, empty, other]