diff --git a/lib/src/lib.rs b/lib/src/lib.rs
index b1cc7668..69c37cc3 100644
--- a/lib/src/lib.rs
+++ b/lib/src/lib.rs
@@ -52,6 +52,10 @@
 )]
 #![doc(html_favicon_url = "https://raw.githubusercontent.com/oxigraph/oxigraph/master/logo.svg")]
 #![doc(html_logo_url = "https://raw.githubusercontent.com/oxigraph/oxigraph/master/logo.svg")]
+#![allow(
+    clippy::multiple_crate_versions, //TODO
+    clippy::rc_buffer //TODO: enforce
+)]
 #![warn(
     clippy::cast_lossless,
     clippy::cast_possible_truncation,
diff --git a/lib/src/model/parser.rs b/lib/src/model/parser.rs
index 16a8ea22..4a8e2ded 100644
--- a/lib/src/model/parser.rs
+++ b/lib/src/model/parser.rs
@@ -80,28 +80,28 @@ impl FromStr for Literal {
     /// assert_eq!(Literal::from_str("-122e+1").unwrap(), Literal::new_typed_literal("-122e+1", xsd::DOUBLE));
     /// ```
     fn from_str(s: &str) -> Result<Self, TermParseError> {
-        if s.starts_with('"') {
-            let mut value = String::with_capacity(s.len() - 2);
-            let mut chars = s[1..].chars();
+        if let Some(s) = s.strip_prefix('"') {
+            let mut value = String::with_capacity(s.len() - 1);
+            let mut chars = s.chars();
             while let Some(c) = chars.next() {
                 match c {
                     '"' => {
                         let remain = chars.as_str();
                         return if remain.is_empty() {
                             Ok(Literal::new_simple_literal(value))
-                        } else if remain.starts_with('@') {
+                        } else if let Some(language) = remain.strip_prefix('@') {
                             Literal::new_language_tagged_literal(value, &remain[1..]).map_err(
                                 |error| TermParseError {
                                     kind: TermParseErrorKind::LanguageTag {
-                                        value: remain[1..].to_owned(),
+                                        value: language.to_owned(),
                                         error,
                                     },
                                 },
                             )
-                        } else if remain.starts_with("^^") {
+                        } else if let Some(datatype) = remain.strip_prefix("^^") {
                             Ok(Literal::new_typed_literal(
                                 value,
-                                NamedNode::from_str(&remain[2..])?,
+                                NamedNode::from_str(datatype)?,
                             ))
                         } else {
                             Err(TermParseError::msg("Unexpected characters after a literal"))
diff --git a/lib/src/model/xsd/date_time.rs b/lib/src/model/xsd/date_time.rs
index 3f68a1d2..90f04873 100644
--- a/lib/src/model/xsd/date_time.rs
+++ b/lib/src/model/xsd/date_time.rs
@@ -1155,7 +1155,7 @@ impl Timestamp {
 
         Ok(Self {
             timezone_offset: props.timezone_offset,
-            value: time_on_timeline(props).ok_or_else(|| DateTimeError {
+            value: time_on_timeline(props).ok_or(DateTimeError {
                 kind: DateTimeErrorKind::Overflow,
             })?,
         })
diff --git a/lib/src/sparql/parser.rs b/lib/src/sparql/parser.rs
index 8a60d193..bb38e4d3 100644
--- a/lib/src/sparql/parser.rs
+++ b/lib/src/sparql/parser.rs
@@ -421,10 +421,7 @@ impl ParserState {
     }
 
     fn new_aggregation(&mut self, agg: Aggregation) -> Result<Variable, &'static str> {
-        let aggregations = self
-            .aggregations
-            .last_mut()
-            .ok_or_else(|| "Unexpected aggregate")?;
+        let aggregations = self.aggregations.last_mut().ok_or("Unexpected aggregate")?;
         Ok(aggregations
             .iter()
             .find_map(|(a, v)| if a == &agg { Some(v) } else { None })
diff --git a/lib/src/sparql/plan.rs b/lib/src/sparql/plan.rs
index 2184a4ec..2e54f268 100644
--- a/lib/src/sparql/plan.rs
+++ b/lib/src/sparql/plan.rs
@@ -500,7 +500,7 @@ impl<I: StrId> EncodedTuple<I> {
         self.inner.get(index).cloned().unwrap_or(None)
     }
 
-    pub fn iter<'a>(&'a self) -> impl Iterator<Item = Option<EncodedTerm<I>>> + 'a {
+    pub fn iter(&self) -> impl Iterator<Item = Option<EncodedTerm<I>>> + '_ {
         self.inner.iter().cloned()
     }
 
diff --git a/lib/src/store/memory.rs b/lib/src/store/memory.rs
index 09fb8846..546f86f6 100644
--- a/lib/src/store/memory.rs
+++ b/lib/src/store/memory.rs
@@ -1033,13 +1033,13 @@ fn remove_from_quad_map<T: Eq + Hash>(quad_map: &mut QuadMap<T>, e1: &T, e2: &T,
     }
 }
 
-fn option_set_flatten<'a, T: Clone>(i: Option<&'a HashSet<T>>) -> impl Iterator<Item = T> + 'a {
+fn option_set_flatten<T: Clone>(i: Option<&HashSet<T>>) -> impl Iterator<Item = T> + '_ {
     i.into_iter().flat_map(|s| s.iter().cloned())
 }
 
-fn option_pair_map_flatten<'a, T: Copy>(
-    i: Option<&'a HashMap<T, HashSet<T>>>,
-) -> impl Iterator<Item = (T, T)> + 'a {
+fn option_pair_map_flatten<T: Copy>(
+    i: Option<&HashMap<T, HashSet<T>>>,
+) -> impl Iterator<Item = (T, T)> + '_ {
     i.into_iter().flat_map(|kv| {
         kv.iter().flat_map(|(k, vs)| {
             let k = *k;
@@ -1048,7 +1048,7 @@ fn option_pair_map_flatten<'a, T: Copy>(
     })
 }
 
-fn triple_map_flatten<'a, T: Copy>(spo: &'a TripleMap<T>) -> impl Iterator<Item = (T, T, T)> + 'a {
+fn triple_map_flatten<T: Copy>(spo: &TripleMap<T>) -> impl Iterator<Item = (T, T, T)> + '_ {
     spo.iter().flat_map(|(s, po)| {
         let s = *s;
         po.iter().flat_map(move |(p, os)| {
@@ -1058,9 +1058,9 @@ fn triple_map_flatten<'a, T: Copy>(spo: &'a TripleMap<T>) -> impl Iterator<Item
     })
 }
 
-fn option_triple_map_flatten<'a, T: Copy>(
-    i: Option<&'a TripleMap<T>>,
-) -> impl Iterator<Item = (T, T, T)> + 'a {
+fn option_triple_map_flatten<T: Copy>(
+    i: Option<&TripleMap<T>>,
+) -> impl Iterator<Item = (T, T, T)> + '_ {
     i.into_iter().flat_map(|spo| {
         spo.iter().flat_map(|(s, po)| {
             let s = *s;
@@ -1072,7 +1072,7 @@ fn option_triple_map_flatten<'a, T: Copy>(
     })
 }
 
-fn quad_map_flatten<'a, T: Copy>(gspo: &'a QuadMap<T>) -> impl Iterator<Item = (T, T, T, T)> + 'a {
+fn quad_map_flatten<T: Copy>(gspo: &QuadMap<T>) -> impl Iterator<Item = (T, T, T, T)> + '_ {
     gspo.iter().flat_map(|(g, spo)| {
         let g = *g;
         spo.iter().flat_map(move |(s, po)| {
diff --git a/python/src/model.rs b/python/src/model.rs
index 1845abaa..9cfb6688 100644
--- a/python/src/model.rs
+++ b/python/src/model.rs
@@ -654,7 +654,7 @@ impl PyQuad {
             subject,
             predicate,
             object,
-            graph_name.unwrap_or_else(|| PyGraphName::DefaultGraph(PyDefaultGraph {})),
+            graph_name.unwrap_or(PyGraphName::DefaultGraph(PyDefaultGraph {})),
         )
         .into()
     }