diff --git a/bindings/node/native/src/tokenizer.rs b/bindings/node/native/src/tokenizer.rs
index f4a49867..d034de9e 100644
--- a/bindings/node/native/src/tokenizer.rs
+++ b/bindings/node/native/src/tokenizer.rs
@@ -502,11 +502,7 @@ declare_types! {
                 let guard = cx.lock();
                 let borrowed = this.borrow(&guard);
                 let normalizer = borrowed.tokenizer.get_normalizer();
-                if let Some(normalizer) = normalizer {
-                    Some(Container::from_ref(normalizer))
-                } else {
-                    None
-                }
+                normalizer.map(|normalizer| { Container::from_ref(normalizer) })
             };
 
             if let Some(normalizer) = normalizer {
@@ -561,11 +557,7 @@ declare_types! {
                 let guard = cx.lock();
                 let borrowed = this.borrow(&guard);
                 let pretok = borrowed.tokenizer.get_pre_tokenizer();
-                if let Some(pretok) = pretok {
-                    Some(Container::from_ref(pretok))
-                } else {
-                    None
-                }
+                pretok.map(|pretok| { Container::from_ref(pretok) })
             };
 
             if let Some(pretok) = pretok {
@@ -620,11 +612,7 @@ declare_types! {
                 let guard = cx.lock();
                 let borrowed = this.borrow(&guard);
                 let processor = borrowed.tokenizer.get_post_processor();
-                if let Some(processor) = processor {
-                    Some(Container::from_ref(processor))
-                } else {
-                    None
-                }
+                processor.map(|processor| { Container::from_ref(processor) })
             };
 
             if let Some(processor) = processor {
@@ -679,11 +667,7 @@ declare_types! {
                 let guard = cx.lock();
                 let borrowed = this.borrow(&guard);
                 let decoder = borrowed.tokenizer.get_decoder();
-                if let Some(decoder) = decoder {
-                    Some(Container::from_ref(decoder))
-                } else {
-                    None
-                }
+                decoder.map(|decoder| { Container::from_ref(decoder) })
             };
 
             if let Some(decoder) = decoder {
diff --git a/bindings/python/src/error.rs b/bindings/python/src/error.rs
index 104cd12d..d7f27e29 100644
--- a/bindings/python/src/error.rs
+++ b/bindings/python/src/error.rs
@@ -23,9 +23,6 @@ impl std::error::Error for PyError {}
 pub struct ToPyResult<T>(pub Result<T>);
 impl<T> std::convert::Into<PyResult<T>> for ToPyResult<T> {
     fn into(self) -> PyResult<T> {
-        match self.0 {
-            Ok(o) => Ok(o),
-            Err(e) => Err(exceptions::Exception::py_err(format!("{}", e))),
-        }
+        self.0.map_err(|e| { exceptions::Exception::py_err(format!("{}", e)) })
     }
 }
diff --git a/tokenizers/Cargo.toml b/tokenizers/Cargo.toml
index e7dab0ff..4be1f423 100644
--- a/tokenizers/Cargo.toml
+++ b/tokenizers/Cargo.toml
@@ -40,7 +40,7 @@ serde_json = "1.0"
 clap = "2.33.0"
 unicode-normalization-alignments = "0.1.12"
 unicode_categories = "0.1.1"
-indicatif = "0.13.0"
+indicatif = "0.14.0"
 
 [dev-dependencies]
 criterion = "0.3.0"
diff --git a/tokenizers/src/models/bpe/model.rs b/tokenizers/src/models/bpe/model.rs
index 77931b4e..36613e64 100644
--- a/tokenizers/src/models/bpe/model.rs
+++ b/tokenizers/src/models/bpe/model.rs
@@ -153,10 +153,7 @@ impl Clone for BPE {
     // `Clone` can't be derive because it's not implemented for `Cache`.
     // To keep things simple when we clone, the new BPE will start with a fresh cache.
     fn clone(&self) -> Self {
-        let fresh_cache = match self.cache {
-            Some(ref cache) => Some(cache.fresh()),
-            None => None,
-        };
+        let fresh_cache = self.cache.as_ref().map(|cache| cache.fresh());
         Self {
             vocab: self.vocab.clone(),
             vocab_r: self.vocab_r.clone(),
@@ -359,10 +356,10 @@ impl Model for BPE {
 
         let mut encoded: Vec<Token> = Vec::with_capacity(sentence.len());
         let mut cached_words = match self.dropout {
-            None => match self.cache {
-                Some(ref cache) => cache.get_values(sentence.iter().map(|(s, _)| s.clone())),
-                None => None,
-            },
+            None => self
+                .cache
+                .as_ref()
+                .and_then(|cache| cache.get_values(sentence.iter().map(|(s, _)| s.clone()))),
             Some(_) => None, // If using dropout we don't want to use the cache.
         };
         let mut should_update_cache = false;
@@ -446,10 +443,9 @@ impl Model for BPE {
         merges_file.write_all(
             &merges
                 .into_iter()
-                .map(|(pair, _)| {
+                .flat_map(|(pair, _)| {
                     format!("{} {}\n", self.vocab_r[&pair.0], self.vocab_r[&pair.1]).into_bytes()
                 })
-                .flatten()
                 .collect::<Vec<_>>()[..],
         )?;
 
diff --git a/tokenizers/src/models/wordpiece/mod.rs b/tokenizers/src/models/wordpiece/mod.rs
index 272db4f0..935749bc 100644
--- a/tokenizers/src/models/wordpiece/mod.rs
+++ b/tokenizers/src/models/wordpiece/mod.rs
@@ -261,8 +261,7 @@ impl Model for WordPiece {
         vocab_file.write_all(
             &vocab
                 .into_iter()
-                .map(|(token, _)| format!("{}\n", token).as_bytes().to_owned())
-                .flatten()
+                .flat_map(|(token, _)| format!("{}\n", token).as_bytes().to_owned())
                 .collect::<Vec<_>>()[..],
         )?;
 
diff --git a/tokenizers/src/pre_tokenizers/byte_level.rs b/tokenizers/src/pre_tokenizers/byte_level.rs
index fd3e18b4..3faf8619 100644
--- a/tokenizers/src/pre_tokenizers/byte_level.rs
+++ b/tokenizers/src/pre_tokenizers/byte_level.rs
@@ -194,9 +194,8 @@ mod tests {
         for sample in samples {
             let pre_tokenized = bl.pre_tokenize(&sample).unwrap();
             let separated_tokens = pre_tokenized
-                .into_iter()
-                .map(|(token, _)| token.split("").map(|t| t.into()).collect::<Vec<_>>())
-                .flatten()
+                .iter()
+                .flat_map(|(token, _)| token.split("").map(|t| t.into()))
                 .collect::<Vec<_>>();
             assert_eq!(sample, bl.decode(separated_tokens).unwrap());
         }
diff --git a/tokenizers/src/pre_tokenizers/metaspace.rs b/tokenizers/src/pre_tokenizers/metaspace.rs
index c0d7a89b..9b8a3a03 100644
--- a/tokenizers/src/pre_tokenizers/metaspace.rs
+++ b/tokenizers/src/pre_tokenizers/metaspace.rs
@@ -57,9 +57,8 @@ impl PreTokenizer for Metaspace {
 impl Decoder for Metaspace {
     fn decode(&self, tokens: Vec<String>) -> Result<String> {
         Ok(tokens
-            .into_iter()
-            .map(|t| t.chars().collect::<Vec<_>>())
-            .flatten()
+            .iter()
+            .flat_map(|t| t.chars())
             .enumerate()
             .map(|(i, c)| {
                 if c == self.replacement {
diff --git a/tokenizers/src/pre_tokenizers/whitespace.rs b/tokenizers/src/pre_tokenizers/whitespace.rs
index 0e05301f..d723f821 100644
--- a/tokenizers/src/pre_tokenizers/whitespace.rs
+++ b/tokenizers/src/pre_tokenizers/whitespace.rs
@@ -9,7 +9,7 @@ impl PreTokenizer for Whitespace {
         }
         Ok(RE
             .captures_iter(s)
-            .map(|captures| {
+            .flat_map(|captures| {
                 captures
                     .iter()
                     .map(|m| {
@@ -21,7 +21,6 @@ impl PreTokenizer for Whitespace {
                     })
                     .collect::<Vec<(String, Offsets)>>()
             })
-            .flatten()
             .collect())
     }
 }
diff --git a/tokenizers/src/tokenizer/mod.rs b/tokenizers/src/tokenizer/mod.rs
index 90b6b486..607d7cdd 100644
--- a/tokenizers/src/tokenizer/mod.rs
+++ b/tokenizers/src/tokenizer/mod.rs
@@ -679,7 +679,7 @@ impl Tokenizer {
             let mut start_offset = 0;
             let mut splits = splits
                 .into_iter()
-                .map(|(start, end)| {
+                .flat_map(|(start, end)| {
                     let mut splits = vec![];
                     if start_offset < start {
                         splits.push((start_offset, start));
@@ -689,7 +689,6 @@ impl Tokenizer {
 
                     splits
                 })
-                .flatten()
                 .collect::<Vec<_>>();
             if let Some((_, end)) = splits.iter().last().copied() {
                 if end < sentence.len() {