diff --git a/Cargo.toml b/Cargo.toml
index fb2aab7..43aebad 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -55,6 +55,7 @@ suspicious = { level = "warn", priority = -1 }
 # These lints are explicitly allowed.
 missing_errors_doc = "allow" # the Error type is self documenting
 map_unwrap_or = "allow"      # we prefer to `map(a).unwrap_or(b)` as it's clear what the fallback value is 
+must_use_candidate = "allow"
 
 # These lints are allowed, but we want to deny them over time
 missing_panics_doc = "allow"
diff --git a/cli/src/cli.rs b/cli/src/cli.rs
index bb2a50b..6c8635d 100644
--- a/cli/src/cli.rs
+++ b/cli/src/cli.rs
@@ -578,7 +578,7 @@ impl Lint {
         );
 
         for warn in warnings {
-            println!(" - {}", warn);
+            println!(" - {warn}");
         }
 
         println!();
diff --git a/ocpi-tariffs/src/explain.rs b/ocpi-tariffs/src/explain.rs
index 8f4bc43..2eefc98 100644
--- a/ocpi-tariffs/src/explain.rs
+++ b/ocpi-tariffs/src/explain.rs
@@ -33,10 +33,10 @@ pub fn explain(tariff: &OcpiTariff) -> Explain {
                 TariffDimensionType::Flat => components.flat = Some(component.price.with_scale(2)),
                 TariffDimensionType::Time => components.time = Some(component.price.with_scale(2)),
                 TariffDimensionType::Energy => {
-                    components.energy = Some(component.price.with_scale(2))
+                    components.energy = Some(component.price.with_scale(2));
                 }
                 TariffDimensionType::ParkingTime => {
-                    components.parking_time = Some(component.price.with_scale(2))
+                    components.parking_time = Some(component.price.with_scale(2));
                 }
             }
         }
@@ -44,7 +44,7 @@ pub fn explain(tariff: &OcpiTariff) -> Explain {
         let restrictions = element
             .restrictions
             .as_ref()
-            .map(|restr| explain_restrictions(restr))
+            .map(explain_restrictions)
             .unwrap_or_default();
 
         elements.push(ExplainElement {
@@ -76,11 +76,11 @@ pub fn explain_restrictions(restr: &OcpiTariffRestriction) -> Vec<String> {
     }
 
     if let Some((start_time, end_time)) = restr.start_time.zip(restr.end_time) {
-        explains.push(format!("between {} and {}", start_time, end_time));
+        explains.push(format!("between {start_time} and {end_time}"));
     } else if let Some(start_time) = restr.start_time {
-        explains.push(format!("after {}", start_time));
+        explains.push(format!("after {start_time}"));
     } else if let Some(end_time) = restr.end_time {
-        explains.push(format!("before {}", end_time));
+        explains.push(format!("before {end_time}"));
     }
 
     if let Some((min_duration, max_duration)) = restr.min_duration.zip(restr.max_duration) {
@@ -102,11 +102,11 @@ pub fn explain_restrictions(restr: &OcpiTariffRestriction) -> Vec<String> {
     }
 
     if let Some((start_date, end_date)) = restr.start_date.zip(restr.end_date) {
-        explains.push(format!("between {} and {}", start_date, end_date));
+        explains.push(format!("between {start_date} and {end_date}"));
     } else if let Some(start_date) = restr.start_date {
-        explains.push(format!("after {}", start_date));
+        explains.push(format!("after {start_date}"));
     } else if let Some(end_date) = restr.end_date {
-        explains.push(format!("before {}", end_date));
+        explains.push(format!("before {end_date}"));
     }
 
     explains
diff --git a/ocpi-tariffs/src/lint.rs b/ocpi-tariffs/src/lint.rs
index b64e745..0558dbc 100644
--- a/ocpi-tariffs/src/lint.rs
+++ b/ocpi-tariffs/src/lint.rs
@@ -124,19 +124,11 @@ pub fn lint(tariff: &OcpiTariff) -> Vec<Warning> {
     }
 
     // Now for each component type we attempt to lint the restrictions.
+    lint_restrictions(&energy_elements, TariffDimensionType::Energy, &mut warnings);
+    lint_restrictions(&flat_elements, TariffDimensionType::Flat, &mut warnings);
+    lint_restrictions(&time_elements, TariffDimensionType::Energy, &mut warnings);
     lint_restrictions(
-        &mut energy_elements,
-        TariffDimensionType::Energy,
-        &mut warnings,
-    );
-    lint_restrictions(&mut flat_elements, TariffDimensionType::Flat, &mut warnings);
-    lint_restrictions(
-        &mut time_elements,
-        TariffDimensionType::Energy,
-        &mut warnings,
-    );
-    lint_restrictions(
-        &mut parking_time_elements,
+        &parking_time_elements,
         TariffDimensionType::ParkingTime,
         &mut warnings,
     );
@@ -156,12 +148,7 @@ pub fn lint(tariff: &OcpiTariff) -> Vec<Warning> {
     for (el_idx, count) in comp_counts {
         // All components are redundant, mark the whole element as redundant.
         if count == 0 {
-            warnings.retain(|w| match w {
-                &Warning::ComponentIsRedundant { element_index, .. } if el_idx == element_index => {
-                    false
-                }
-                _ => true,
-            });
+            warnings.retain(|w| !matches!(w, &Warning::ComponentIsRedundant { element_index, .. } if el_idx == element_index));
 
             warnings.push(Warning::ElementIsRedundant {
                 element_index: el_idx,
@@ -179,7 +166,7 @@ struct UnaryElement {
 }
 
 fn lint_restrictions(
-    elements: &mut Vec<UnaryElement>,
+    elements: &[UnaryElement],
     ty: TariffDimensionType,
     warnings: &mut Vec<Warning>,
 ) {
@@ -200,7 +187,7 @@ fn lint_restrictions(
 
     let mut matrix = Matrix::new(bounds);
 
-    for element in elements.iter() {
+    for element in elements {
         let Some(restr) = &element.restrictions else {
             matrix.add_pattern(Pattern::new(
                 vec![Range::wildcard(); 4],
@@ -262,7 +249,7 @@ fn lint_restrictions(
             warnings.push(Warning::ComponentIsRedundant {
                 element_index,
                 component_index,
-            })
+            });
         }
     }
 
@@ -273,7 +260,7 @@ fn lint_restrictions(
 
     // If the trailing wildcard is useful it means all the elements above are non-exhaustive.
     if last.is_usefull {
-        warnings.push(Warning::DimensionNotExhaustive { ty, cases: vec![] })
+        warnings.push(Warning::DimensionNotExhaustive { ty, cases: vec![] });
     }
 }
 
@@ -292,7 +279,7 @@ impl Matrix {
     }
 
     fn add_pattern(&mut self, pattern: Pattern) {
-        self.patterns.push(pattern)
+        self.patterns.push(pattern);
     }
 
     /// Computes usefulness for the whole matrix and mark the patterns with usefulness.
@@ -307,7 +294,9 @@ impl Matrix {
             if !witnesses.is_empty() {
                 self.patterns[i].is_usefull = true;
 
-                witnesses.iter_mut().for_each(|v| v.reverse());
+                for witness in &mut witnesses {
+                    witness.reverse();
+                }
 
                 self.patterns[i].witness = witnesses;
             }
@@ -355,13 +344,13 @@ impl Matrix {
                     continue;
                 }
 
-                next_consider.push(i)
+                next_consider.push(i);
             }
 
             for mut witness in self.usefulness_rec(column + 1, pattern, &next_consider) {
                 witness.push(constr);
 
-                witnesses.push(witness)
+                witnesses.push(witness);
             }
         }
 
diff --git a/ocpi-tariffs/src/normalize.rs b/ocpi-tariffs/src/normalize.rs
index cf4af0d..fef46ad 100644
--- a/ocpi-tariffs/src/normalize.rs
+++ b/ocpi-tariffs/src/normalize.rs
@@ -20,8 +20,8 @@ pub fn normalize(tariff: &mut OcpiTariff) {
         }
     }
 
-    remove_components.sort();
-    remove_elements.sort();
+    remove_components.sort_unstable();
+    remove_elements.sort_unstable();
 
     // Remove them in sorted reverse order for the indices to stay intact.
     for &(el, comp) in remove_components.iter().rev() {
diff --git a/ocpi-tariffs/src/types/electricity.rs b/ocpi-tariffs/src/types/electricity.rs
index 267ab23..88940ce 100644
--- a/ocpi-tariffs/src/types/electricity.rs
+++ b/ocpi-tariffs/src/types/electricity.rs
@@ -49,6 +49,7 @@ impl Kwh {
     }
 
     /// Round this number to the specified amount of decimals.
+    #[must_use]
     pub fn with_scale(self, scale: u32) -> Self {
         Self(self.0.with_scale(scale))
     }
diff --git a/ocpi-tariffs/src/types/money.rs b/ocpi-tariffs/src/types/money.rs
index 310ef17..ff9bb82 100644
--- a/ocpi-tariffs/src/types/money.rs
+++ b/ocpi-tariffs/src/types/money.rs
@@ -36,6 +36,7 @@ impl Price {
     }
 
     /// Round this number to the specified amount of decimals.
+    #[must_use]
     pub fn with_scale(self, scale: u32) -> Self {
         Self {
             excl_vat: self.excl_vat.with_scale(scale),
@@ -81,6 +82,7 @@ impl Money {
     }
 
     /// Round this number to the specified amount of decimals.
+    #[must_use]
     pub fn with_scale(self, scale: u32) -> Self {
         Self(self.0.with_scale(scale))
     }