diff --git a/src/read.rs b/src/read.rs
index b702b4f21..f42b7221a 100644
--- a/src/read.rs
+++ b/src/read.rs
@@ -935,8 +935,7 @@ impl<'a> ZipFile<'a> {
     pub fn is_dir(&self) -> bool {
         self.name()
             .chars()
-            .rev()
-            .next()
+            .next_back()
             .map_or(false, |c| c == '/' || c == '\\')
     }
 
@@ -991,7 +990,7 @@ impl<'a> Drop for ZipFile<'a> {
             // Get the inner `Take` reader so all decryption, decompression and CRC calculation is skipped.
             let mut reader: std::io::Take<&mut dyn std::io::Read> = match &mut self.reader {
                 ZipFileReader::NoReader => {
-                    let innerreader = ::std::mem::replace(&mut self.crypto_reader, None);
+                    let innerreader = self.crypto_reader.take();
                     innerreader.expect("Invalid reader state").into_inner()
                 }
                 reader => {
diff --git a/src/read/stream.rs b/src/read/stream.rs
index 5a01b23f9..dc967ee89 100644
--- a/src/read/stream.rs
+++ b/src/read/stream.rs
@@ -184,8 +184,7 @@ impl ZipStreamFileMetadata {
     pub fn is_dir(&self) -> bool {
         self.name()
             .chars()
-            .rev()
-            .next()
+            .next_back()
             .map_or(false, |c| c == '/' || c == '\\')
     }
 
diff --git a/src/write.rs b/src/write.rs
index 4cdc031b0..cfa43306c 100644
--- a/src/write.rs
+++ b/src/write.rs
@@ -411,7 +411,7 @@ impl<W: Write + io::Seek> ZipWriter<W> {
         }
         if let Some(keys) = options.encrypt_with {
             let mut zipwriter = crate::zipcrypto::ZipCryptoWriter { writer: core::mem::replace(&mut self.inner, GenericZipWriter::Closed).unwrap(), buffer: vec![], keys };
-            let mut crypto_header = [0u8; 12];
+            let crypto_header = [0u8; 12];
 
             zipwriter.write_all(&crypto_header)?;
             self.inner = GenericZipWriter::Storer(MaybeEncrypted::Encrypted(zipwriter));