go through a ton of pedantic clippy lints

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

src/utils/error.rs

@@ -100,7 +100,11 @@ impl Error {
 
         let message = format!("{self}");
 
-        use ErrorKind::*;
+        use ErrorKind::{
+            Forbidden, GuestAccessForbidden, LimitExceeded, MissingToken, NotFound,
+            ThreepidAuthFailed, ThreepidDenied, TooLarge, Unauthorized, Unknown, UnknownToken,
+            Unrecognized, UserDeactivated, WrongRoomKeysVersion,
+        };
         let (kind, status_code) = match self {
             Self::BadRequest(kind, _) => (
                 kind.clone(),

src/utils/mod.rs

@@ -22,7 +22,7 @@ pub(crate) fn millis_since_unix_epoch() -> u64 {
 }
 
 pub(crate) fn increment(old: Option<&[u8]>) -> Option<Vec<u8>> {
-    let number = match old.map(|bytes| bytes.try_into()) {
+    let number = match old.map(std::convert::TryInto::try_into) {
         Some(Ok(bytes)) => {
             let number = u64::from_be_bytes(bytes);
             number + 1
@@ -94,7 +94,9 @@ pub(crate) fn common_elements(
     check_order: impl Fn(&[u8], &[u8]) -> Ordering,
 ) -> Option<impl Iterator<Item = Vec<u8>>> {
     let first_iterator = iterators.next()?;
-    let mut other_iterators = iterators.map(|i| i.peekable()).collect::<Vec<_>>();
+    let mut other_iterators = iterators
+        .map(std::iter::Iterator::peekable)
+        .collect::<Vec<_>>();
 
     Some(first_iterator.filter(move |target| {
         other_iterators.iter_mut().all(|it| {