diff --git a/nac3artiq/src/codegen.rs b/nac3artiq/src/codegen.rs
index 94860e4..a4cca53 100644
--- a/nac3artiq/src/codegen.rs
+++ b/nac3artiq/src/codegen.rs
@@ -91,9 +91,9 @@ impl<'a> ArtiqCodeGenerator<'a> {
     ///
     /// Direct-`parallel` block context refers to when the generator is generating statements whose
     /// closest parent `with` statement is a `with parallel` block.
-    fn timeline_reset_start<'ctx, 'b>(
+    fn timeline_reset_start(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'b>
+        ctx: &mut CodeGenContext<'_, '_>
     ) -> Result<(), String> {
         if let Some(start) = self.start.clone() {
             let start_val = self.gen_expr(ctx, &start)?
@@ -117,9 +117,9 @@ impl<'a> ArtiqCodeGenerator<'a> {
     ///
     /// * `store_name` - The LLVM value name for the pointer to `end`. `.addr` will be appended to
     /// the end of the provided value name.
-    fn timeline_update_end_max<'ctx, 'b>(
+    fn timeline_update_end_max(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'b>,
+        ctx: &mut CodeGenContext<'_, '_>,
         end: Option<Expr<Option<Type>>>,
         store_name: Option<&str>,
     ) -> Result<(), String> {
@@ -192,9 +192,9 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
         }
     }
 
-    fn gen_call<'ctx, 'a>(
+    fn gen_call<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         obj: Option<(Type, ValueEnum<'ctx>)>,
         fun: (&FunSignature, DefinitionId),
         params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
@@ -210,9 +210,9 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
         Ok(result)
     }
 
-    fn gen_with<'ctx, 'a>(
+    fn gen_with(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmt: &Stmt<Option<Type>>,
     ) -> Result<(), String> {
         if let StmtKind::With { items, body, .. } = &stmt.node {
@@ -360,8 +360,8 @@ impl<'b> CodeGenerator for ArtiqCodeGenerator<'b> {
     }
 }
 
-fn gen_rpc_tag<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+fn gen_rpc_tag(
+    ctx: &mut CodeGenContext<'_, '_>,
     ty: Type,
     buffer: &mut Vec<u8>,
 ) -> Result<(), String> {
@@ -406,8 +406,8 @@ fn gen_rpc_tag<'ctx, 'a>(
     Ok(())
 }
 
-fn rpc_codegen_callback_fn<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+fn rpc_codegen_callback_fn<'ctx>(
+    ctx: &mut CodeGenContext<'ctx, '_>,
     obj: Option<(Type, ValueEnum<'ctx>)>,
     fun: (&FunSignature, DefinitionId),
     args: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
@@ -617,8 +617,8 @@ fn rpc_codegen_callback_fn<'ctx, 'a>(
     Ok(Some(result))
 }
 
-pub fn attributes_writeback<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+pub fn attributes_writeback(
+    ctx: &mut CodeGenContext<'_, '_>,
     generator: &mut dyn CodeGenerator,
     inner_resolver: &InnerResolver,
     host_attributes: PyObject,
diff --git a/nac3artiq/src/lib.rs b/nac3artiq/src/lib.rs
index 718b2b7..0b70b6d 100644
--- a/nac3artiq/src/lib.rs
+++ b/nac3artiq/src/lib.rs
@@ -259,9 +259,8 @@ impl Nac3 {
                 };
                 if let Err(e) = unifier.unify(in_ty, *ty) {
                     return Some(format!(
-                        "type error ({}) at parameter #{} when calling kernel function",
-                        e.to_display(unifier).to_string(),
-                        i
+                        "type error ({}) at parameter #{i} when calling kernel function",
+                        e.to_display(unifier),
                     ));
                 }
             }
@@ -1020,7 +1019,7 @@ impl Nac3 {
             let link_fn = |module: &Module| {
                 let working_directory = self.working_directory.path().to_owned();
                 target_machine
-                    .write_to_file(&module, FileType::Object, &working_directory.join("module.o"))
+                    .write_to_file(module, FileType::Object, &working_directory.join("module.o"))
                     .expect("couldn't write module to file");
 
                 let filename_path = self.working_directory.path().join("module.elf");
@@ -1037,7 +1036,7 @@ impl Nac3 {
         } else {
             let link_fn = |module: &Module| {
                 let object_mem = target_machine
-                    .write_to_memory_buffer(&module, FileType::Object)
+                    .write_to_memory_buffer(module, FileType::Object)
                     .expect("couldn't write module to object file buffer");
                 if let Ok(dyn_lib) = Linker::ld(object_mem.as_slice()) {
                     Ok(PyBytes::new(py, &dyn_lib).into())
diff --git a/nac3artiq/src/symbol_resolver.rs b/nac3artiq/src/symbol_resolver.rs
index 23b609f..a736732 100644
--- a/nac3artiq/src/symbol_resolver.rs
+++ b/nac3artiq/src/symbol_resolver.rs
@@ -93,9 +93,9 @@ impl StaticValue for PythonValue {
         self.id
     }
 
-    fn get_const_obj<'ctx, 'a>(
+    fn get_const_obj<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         _: &mut dyn CodeGenerator,
     ) -> BasicValueEnum<'ctx> {
         ctx.module
@@ -148,10 +148,10 @@ impl StaticValue for PythonValue {
         }).map_err(|e| e.to_string())
     }
 
-    fn get_field<'ctx, 'a>(
+    fn get_field<'ctx>(
         &self,
         name: StrRef,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
     ) -> Option<ValueEnum<'ctx>> {
         {
             let field_to_val = self.resolver.field_to_val.read();
@@ -256,9 +256,8 @@ impl InnerResolver {
                 Ok(_) => ty,
                 Err(e) => {
                     return Ok(Err(format!(
-                        "inhomogeneous type ({}) at element #{} of the list",
-                        e.to_display(unifier).to_string(),
-                        i
+                        "inhomogeneous type ({}) at element #{i} of the list",
+                        e.to_display(unifier)
                     )))
                 }
             };
@@ -294,9 +293,7 @@ impl InnerResolver {
             Ok(Ok((primitives.uint64, true)))
         } else if ty_id == self.primitive_ids.bool {
             Ok(Ok((primitives.bool, true)))
-        } else if ty_id == self.primitive_ids.float {
-            Ok(Ok((primitives.float, true)))
-        } else if ty_id == self.primitive_ids.float64 {
+        } else if ty_id == self.primitive_ids.float || ty_id == self.primitive_ids.float64 {
             Ok(Ok((primitives.float, true)))
         } else if ty_id == self.primitive_ids.exception {
             Ok(Ok((primitives.exception, true)))
@@ -577,7 +574,7 @@ impl InnerResolver {
                         object_id, methods, constructor, ..
                     } = &*def.read() {
                         if object_id == def_id && constructor.is_some() && methods.iter().any(|(s, _, _)| s == &"__init__".into()) {
-                            return constructor.clone();
+                            return *constructor;
                         }
                     }
                     None
@@ -630,7 +627,7 @@ impl InnerResolver {
                             Ok(_) => Ok(Ok(unifier.add_ty(TypeEnum::TList { ty: *ty }))),
                             Err(e) => Ok(Err(format!(
                                 "type error ({}) for the list",
-                                e.to_display(unifier).to_string()
+                                e.to_display(unifier)
                             ))),
                         },
                         Err(e) => Ok(Err(e)),
@@ -734,9 +731,8 @@ impl InnerResolver {
                             if let Err(e) = unifier.unify(ty, field_ty) {
                                 // field type mismatch
                                 return Ok(Err(format!(
-                                    "error when getting type of field `{}` ({})",
-                                    name,
-                                    e.to_display(unifier).to_string()
+                                    "error when getting type of field `{name}` ({})",
+                                    e.to_display(unifier)
                                 )));
                             }
                         }
@@ -797,11 +793,11 @@ impl InnerResolver {
         }
     }
 
-    pub fn get_obj_value<'ctx, 'a>(
+    pub fn get_obj_value<'ctx>(
         &self,
         py: Python,
         obj: &PyAny,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         generator: &mut dyn CodeGenerator,
         expected_ty: Type,
     ) -> PyResult<Option<BasicValueEnum<'ctx>>> {
@@ -1151,10 +1147,10 @@ impl SymbolResolver for Resolver {
         }
     }
 
-    fn get_symbol_value<'ctx, 'a>(
+    fn get_symbol_value<'ctx>(
         &self,
         id: StrRef,
-        _: &mut CodeGenContext<'ctx, 'a>,
+        _: &mut CodeGenContext<'ctx, '_>,
     ) -> Option<ValueEnum<'ctx>> {
         let sym_value = {
             let id_to_val = self.0.id_to_pyval.read();
diff --git a/nac3artiq/src/timeline.rs b/nac3artiq/src/timeline.rs
index e3fc124..de45338 100644
--- a/nac3artiq/src/timeline.rs
+++ b/nac3artiq/src/timeline.rs
@@ -5,13 +5,13 @@ use nac3core::codegen::CodeGenContext;
 pub trait TimeFns {
 
     /// Emits LLVM IR for `now_mu`.
-    fn emit_now_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>) -> BasicValueEnum<'ctx>;
+    fn emit_now_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>) -> BasicValueEnum<'ctx>;
 
     /// Emits LLVM IR for `at_mu`.
-    fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>);
+    fn emit_at_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>, t: BasicValueEnum<'ctx>);
 
     /// Emits LLVM IR for `delay_mu`.
-    fn emit_delay_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, dt: BasicValueEnum<'ctx>);
+    fn emit_delay_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>, dt: BasicValueEnum<'ctx>);
 }
 
 pub struct NowPinningTimeFns64 {}
@@ -19,7 +19,7 @@ pub struct NowPinningTimeFns64 {}
 // For FPGA design reasons, on VexRiscv with 64-bit data bus, the "now" CSR is split into two 32-bit
 // values that are each padded to 64-bits.
 impl TimeFns for NowPinningTimeFns64 {
-    fn emit_now_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>) -> BasicValueEnum<'ctx> {
+    fn emit_now_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>) -> BasicValueEnum<'ctx> {
         let i64_type = ctx.ctx.i64_type();
         let i32_type = ctx.ctx.i32_type();
         let now = ctx
@@ -54,7 +54,7 @@ impl TimeFns for NowPinningTimeFns64 {
         }
     }
 
-    fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>) {
+    fn emit_at_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>, t: BasicValueEnum<'ctx>) {
         let i32_type = ctx.ctx.i32_type();
         let i64_type = ctx.ctx.i64_type();
 
@@ -96,9 +96,9 @@ impl TimeFns for NowPinningTimeFns64 {
         }
     }
 
-    fn emit_delay_mu<'ctx, 'a>(
+    fn emit_delay_mu<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         dt: BasicValueEnum<'ctx>,
     ) {
         let i64_type = ctx.ctx.i64_type();
@@ -168,7 +168,7 @@ pub static NOW_PINNING_TIME_FNS_64: NowPinningTimeFns64 = NowPinningTimeFns64 {}
 pub struct NowPinningTimeFns {}
 
 impl TimeFns for NowPinningTimeFns {
-    fn emit_now_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>) -> BasicValueEnum<'ctx> {
+    fn emit_now_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>) -> BasicValueEnum<'ctx> {
         let i64_type = ctx.ctx.i64_type();
         let now = ctx
             .module
@@ -186,7 +186,7 @@ impl TimeFns for NowPinningTimeFns {
         }
     }
 
-    fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>) {
+    fn emit_at_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>, t: BasicValueEnum<'ctx>) {
         let i32_type = ctx.ctx.i32_type();
         let i64_type = ctx.ctx.i64_type();
         let i64_32 = i64_type.const_int(32, false);
@@ -228,9 +228,9 @@ impl TimeFns for NowPinningTimeFns {
         }
     }
 
-    fn emit_delay_mu<'ctx, 'a>(
+    fn emit_delay_mu<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         dt: BasicValueEnum<'ctx>,
     ) {
         let i32_type = ctx.ctx.i32_type();
@@ -285,14 +285,14 @@ pub static NOW_PINNING_TIME_FNS: NowPinningTimeFns = NowPinningTimeFns {};
 pub struct ExternTimeFns {}
 
 impl TimeFns for ExternTimeFns {
-    fn emit_now_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>) -> BasicValueEnum<'ctx> {
+    fn emit_now_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>) -> BasicValueEnum<'ctx> {
         let now_mu = ctx.module.get_function("now_mu").unwrap_or_else(|| {
             ctx.module.add_function("now_mu", ctx.ctx.i64_type().fn_type(&[], false), None)
         });
         ctx.builder.build_call(now_mu, &[], "now_mu").try_as_basic_value().left().unwrap()
     }
 
-    fn emit_at_mu<'ctx, 'a>(&self, ctx: &mut CodeGenContext<'ctx, 'a>, t: BasicValueEnum<'ctx>) {
+    fn emit_at_mu<'ctx>(&self, ctx: &mut CodeGenContext<'ctx, '_>, t: BasicValueEnum<'ctx>) {
         let at_mu = ctx.module.get_function("at_mu").unwrap_or_else(|| {
             ctx.module.add_function(
                 "at_mu",
@@ -303,9 +303,9 @@ impl TimeFns for ExternTimeFns {
         ctx.builder.build_call(at_mu, &[t.into()], "at_mu");
     }
 
-    fn emit_delay_mu<'ctx, 'a>(
+    fn emit_delay_mu<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         dt: BasicValueEnum<'ctx>,
     ) {
         let delay_mu = ctx.module.get_function("delay_mu").unwrap_or_else(|| {
diff --git a/nac3core/src/codegen/concrete_type.rs b/nac3core/src/codegen/concrete_type.rs
index 03a9997..f3f619d 100644
--- a/nac3core/src/codegen/concrete_type.rs
+++ b/nac3core/src/codegen/concrete_type.rs
@@ -194,7 +194,7 @@ impl ConcreteTypeStore {
                     ty: self.from_unifier_type(unifier, primitives, *ty, cache),
                 },
                 TypeEnum::TFunc(signature) => {
-                    self.from_signature(unifier, primitives, &*signature, cache)
+                    self.from_signature(unifier, primitives, signature, cache)
                 }
                 _ => unreachable!(),
             };
diff --git a/nac3core/src/codegen/expr.rs b/nac3core/src/codegen/expr.rs
index 2a568a9..88d68f7 100644
--- a/nac3core/src/codegen/expr.rs
+++ b/nac3core/src/codegen/expr.rs
@@ -237,7 +237,7 @@ impl<'ctx, 'a> CodeGenContext<'ctx, 'a> {
                 let ty = self.unifier.get_ty(ty);
                 let types =
                     if let TypeEnum::TTuple { ty } = &*ty { ty.clone() } else { unreachable!() };
-                let values = zip(types.into_iter(), v.iter())
+                let values = zip(types, v.iter())
                     .map_while(|(ty, v)| self.gen_const(generator, v, ty))
                     .collect_vec();
 
@@ -609,7 +609,7 @@ pub fn gen_constructor<'ctx, 'a, G: CodeGenerator>(
     match def {
         TopLevelDef::Class { methods, .. } => {
             // TODO: what about other fields that require alloca?
-            let fun_id = methods.iter().find(|method| method.0 == "__init__".into()).and_then(|method| Some(method.2));
+            let fun_id = methods.iter().find(|method| method.0 == "__init__".into()).map(|method| method.2);
             let ty = ctx.get_llvm_type(generator, signature.ret).into_pointer_type();
             let zelf_ty: BasicTypeEnum = ty.get_element_type().try_into().unwrap();
             let zelf: BasicValueEnum<'ctx> = ctx.builder.build_alloca(zelf_ty, "alloca").into();
@@ -631,8 +631,8 @@ pub fn gen_constructor<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_func_instance].
-pub fn gen_func_instance<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+pub fn gen_func_instance<'ctx>(
+    ctx: &mut CodeGenContext<'ctx, '_>,
     obj: Option<(Type, ValueEnum<'ctx>)>,
     fun: (&FunSignature, &mut TopLevelDef, String),
     id: usize,
@@ -708,9 +708,9 @@ pub fn gen_func_instance<'ctx, 'a>(
 }
 
 /// See [CodeGenerator::gen_call].
-pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_call<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     obj: Option<(Type, ValueEnum<'ctx>)>,
     fun: (&FunSignature, DefinitionId),
     params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
@@ -797,7 +797,7 @@ pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
                 instance_to_symbol.get(&key).cloned().ok_or_else(|| "".into())
             }
             TopLevelDef::Class { .. } => {
-                return Ok(Some(generator.gen_constructor(ctx, fun.0, &*def, params)?))
+                return Ok(Some(generator.gen_constructor(ctx, fun.0, &def, params)?))
             }
         }
     }
@@ -814,7 +814,7 @@ pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
         } else {
             Some(ctx.get_llvm_abi_type(generator, fun.0.ret))
         };
-        let has_sret = ret_type.map_or(false, |ret_type| need_sret(ctx.ctx, ret_type));
+        let has_sret = ret_type.map_or(false, |ret_type| need_sret(ret_type));
         let mut byrefs = Vec::new();
         let mut params = args.iter().enumerate()
             .map(|(i, arg)| match ctx.get_llvm_abi_type(generator, arg.ty) {
@@ -858,7 +858,7 @@ pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
     });
 
     // Convert boolean parameter values into i1
-    let param_vals = (&fun_val.get_params()).iter().zip(param_vals)
+    let param_vals = fun_val.get_params().iter().zip(param_vals)
         .map(|(p, v)| {
             if p.is_int_value() && v.is_int_value() {
                 let expected_ty = p.into_int_value().get_type();
@@ -880,8 +880,8 @@ pub fn gen_call<'ctx, 'a, G: CodeGenerator>(
 
 /// Generates three LLVM variables representing the start, stop, and step values of a [range] class
 /// respectively.
-pub fn destructure_range<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+pub fn destructure_range<'ctx>(
+    ctx: &mut CodeGenContext<'ctx, '_>,
     range: PointerValue<'ctx>,
 ) -> (IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>) {
     let int32 = ctx.ctx.i32_type();
@@ -903,9 +903,9 @@ pub fn destructure_range<'ctx, 'a>(
 /// Returns an instance of [PointerValue] pointing to the List structure. The List structure is
 /// defined as `type { ty*, size_t }` in LLVM, where the first element stores the pointer to the
 /// data, and the second element stores the size of the List.
-pub fn allocate_list<'ctx, 'a, G: CodeGenerator>(
+pub fn allocate_list<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     ty: BasicTypeEnum<'ctx>,
     length: IntValue<'ctx>,
     name: Option<&str>,
@@ -949,9 +949,9 @@ pub fn allocate_list<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// Generates LLVM IR for a [list comprehension expression][expr].
-pub fn gen_comprehension<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_comprehension<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     expr: &Expr<Option<Type>>,
 ) -> Result<Option<BasicValueEnum<'ctx>>, String> {
     if let ExprKind::ListComp { elt, generators } = &expr.node {
@@ -1129,9 +1129,9 @@ pub fn gen_comprehension<'ctx, 'a, G: CodeGenerator>(
 /// * `right` - The right-hand side of the binary operator.
 /// * `loc` - The location of the full expression.
 /// * `is_aug_assign` - Whether the binary operator expression is also an assignment operator.
-pub fn gen_binop_expr<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_binop_expr<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     left: &Expr<Option<Type>>,
     op: &Operator,
     right: &Expr<Option<Type>>,
@@ -1231,9 +1231,9 @@ pub fn gen_binop_expr<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_expr].
-pub fn gen_expr<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_expr<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     expr: &Expr<Option<Type>>,
 ) -> Result<Option<ValueEnum<'ctx>>, String> {
     ctx.current_loc = expr.location;
diff --git a/nac3core/src/codegen/generator.rs b/nac3core/src/codegen/generator.rs
index e304473..e7a43b7 100644
--- a/nac3core/src/codegen/generator.rs
+++ b/nac3core/src/codegen/generator.rs
@@ -22,9 +22,9 @@ pub trait CodeGenerator {
     /// - fun: Function signature and definition ID.
     /// - params: Function parameters. Note that this does not include the object even if the
     ///   function is a class method.
-    fn gen_call<'ctx, 'a>(
+    fn gen_call<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         obj: Option<(Type, ValueEnum<'ctx>)>,
         fun: (&FunSignature, DefinitionId),
         params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
@@ -39,9 +39,9 @@ pub trait CodeGenerator {
     /// - signature: Function signature of the constructor.
     /// - def: Class definition for the constructor class.
     /// - params: Function parameters.
-    fn gen_constructor<'ctx, 'a>(
+    fn gen_constructor<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         signature: &FunSignature,
         def: &TopLevelDef,
         params: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
@@ -59,9 +59,9 @@ pub trait CodeGenerator {
     ///   function is a class method.
     /// Note that this function should check if the function is generated in another thread (due to
     /// possible race condition), see the default implementation for an example.
-    fn gen_func_instance<'ctx, 'a>(
+    fn gen_func_instance<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         obj: Option<(Type, ValueEnum<'ctx>)>,
         fun: (&FunSignature, &mut TopLevelDef, String),
         id: usize,
@@ -70,9 +70,9 @@ pub trait CodeGenerator {
     }
 
     /// Generate the code for an expression.
-    fn gen_expr<'ctx, 'a>(
+    fn gen_expr<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         expr: &Expr<Option<Type>>,
     ) -> Result<Option<ValueEnum<'ctx>>, String>
     where
@@ -83,9 +83,9 @@ pub trait CodeGenerator {
 
     /// Allocate memory for a variable and return a pointer pointing to it.
     /// The default implementation places the allocations at the start of the function.
-    fn gen_var_alloc<'ctx, 'a>(
+    fn gen_var_alloc<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         ty: BasicTypeEnum<'ctx>,
         name: Option<&str>,
     ) -> Result<PointerValue<'ctx>, String> {
@@ -93,9 +93,9 @@ pub trait CodeGenerator {
     }
 
     /// Return a pointer pointing to the target of the expression.
-    fn gen_store_target<'ctx, 'a>(
+    fn gen_store_target<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         pattern: &Expr<Option<Type>>,
         name: Option<&str>,
     ) -> Result<Option<PointerValue<'ctx>>, String>
@@ -106,9 +106,9 @@ pub trait CodeGenerator {
     }
 
     /// Generate code for an assignment expression.
-    fn gen_assign<'ctx, 'a>(
+    fn gen_assign<'ctx>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         target: &Expr<Option<Type>>,
         value: ValueEnum<'ctx>,
     ) -> Result<(), String>
@@ -120,9 +120,9 @@ pub trait CodeGenerator {
 
     /// Generate code for a while expression.
     /// Return true if the while loop must early return
-    fn gen_while<'ctx, 'a>(
+    fn gen_while(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmt: &Stmt<Option<Type>>,
     ) -> Result<(), String>
     where
@@ -133,9 +133,9 @@ pub trait CodeGenerator {
 
     /// Generate code for a while expression.
     /// Return true if the while loop must early return
-    fn gen_for<'ctx, 'a>(
+    fn gen_for(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmt: &Stmt<Option<Type>>,
     ) -> Result<(), String>
     where
@@ -146,9 +146,9 @@ pub trait CodeGenerator {
 
     /// Generate code for an if expression.
     /// Return true if the statement must early return
-    fn gen_if<'ctx, 'a>(
+    fn gen_if(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmt: &Stmt<Option<Type>>,
     ) -> Result<(), String>
     where
@@ -157,9 +157,9 @@ pub trait CodeGenerator {
         gen_if(self, ctx, stmt)
     }
 
-    fn gen_with<'ctx, 'a>(
+    fn gen_with(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmt: &Stmt<Option<Type>>,
     ) -> Result<(), String>
     where
@@ -171,9 +171,9 @@ pub trait CodeGenerator {
     /// Generate code for a statement
     ///
     /// Return true if the statement must early return
-    fn gen_stmt<'ctx, 'a>(
+    fn gen_stmt(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmt: &Stmt<Option<Type>>,
     ) -> Result<(), String>
     where
@@ -183,9 +183,9 @@ pub trait CodeGenerator {
     }
 
     /// Generates code for a block statement.
-    fn gen_block<'ctx, 'a, 'b, I: Iterator<Item = &'b Stmt<Option<Type>>>>(
+    fn gen_block<'a, I: Iterator<Item = &'a Stmt<Option<Type>>>>(
         &mut self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'_, '_>,
         stmts: I,
     ) -> Result<(), String>
     where
@@ -195,21 +195,21 @@ pub trait CodeGenerator {
     }
 
     /// See [bool_to_i1].
-    fn bool_to_i1<'ctx, 'a>(
+    fn bool_to_i1<'ctx>(
         &self,
-        ctx: &CodeGenContext<'ctx, 'a>,
+        ctx: &CodeGenContext<'ctx, '_>,
         bool_value: IntValue<'ctx>
     ) -> IntValue<'ctx> {
         bool_to_i1(&ctx.builder, bool_value)
     }
 
     /// See [bool_to_i8].
-    fn bool_to_i8<'ctx, 'a>(
+    fn bool_to_i8<'ctx>(
         &self,
-        ctx: &CodeGenContext<'ctx, 'a>,
+        ctx: &CodeGenContext<'ctx, '_>,
         bool_value: IntValue<'ctx>
     ) -> IntValue<'ctx> {
-        bool_to_i8(&ctx.builder, &ctx.ctx, bool_value)
+        bool_to_i8(&ctx.builder, ctx.ctx, bool_value)
     }
 }
 
@@ -220,7 +220,7 @@ pub struct DefaultCodeGenerator {
 
 impl DefaultCodeGenerator {
     pub fn new(name: String, size_t: u32) -> DefaultCodeGenerator {
-        assert!(size_t == 32 || size_t == 64);
+        assert!(matches!(size_t, 32 | 64));
         DefaultCodeGenerator { name, size_t }
     }
 }
diff --git a/nac3core/src/codegen/irrt/mod.rs b/nac3core/src/codegen/irrt/mod.rs
index 074c169..76e50a0 100644
--- a/nac3core/src/codegen/irrt/mod.rs
+++ b/nac3core/src/codegen/irrt/mod.rs
@@ -33,9 +33,9 @@ pub fn load_irrt(ctx: &Context) -> Module {
 
 // repeated squaring method adapted from GNU Scientific Library:
 // https://git.savannah.gnu.org/cgit/gsl.git/tree/sys/pow_int.c
-pub fn integer_power<'ctx, 'a>(
+pub fn integer_power<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     base: IntValue<'ctx>,
     exp: IntValue<'ctx>,
     signed: bool,
@@ -74,9 +74,9 @@ pub fn integer_power<'ctx, 'a>(
         .into_int_value()
 }
 
-pub fn calculate_len_for_slice_range<'ctx, 'a>(
+pub fn calculate_len_for_slice_range<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     start: IntValue<'ctx>,
     end: IntValue<'ctx>,
     step: IntValue<'ctx>,
@@ -151,11 +151,11 @@ pub fn calculate_len_for_slice_range<'ctx, 'a>(
 ///             ,step
 ///         )
 /// ```
-pub fn handle_slice_indices<'a, 'ctx, G: CodeGenerator>(
+pub fn handle_slice_indices<'ctx, G: CodeGenerator>(
     start: &Option<Box<Expr<Option<Type>>>>,
     end: &Option<Box<Expr<Option<Type>>>>,
     step: &Option<Box<Expr<Option<Type>>>>,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     generator: &mut G,
     list: PointerValue<'ctx>,
 ) -> Result<Option<(IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>)>, String> {
@@ -260,9 +260,9 @@ pub fn handle_slice_indices<'a, 'ctx, G: CodeGenerator>(
 
 /// this function allows index out of range, since python
 /// allows index out of range in slice (`a = [1,2,3]; a[1:10] == [2,3]`).
-pub fn handle_slice_index_bound<'a, 'ctx, G: CodeGenerator>(
+pub fn handle_slice_index_bound<'ctx, G: CodeGenerator>(
     i: &Expr<Option<Type>>,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     generator: &mut G,
     length: IntValue<'ctx>,
 ) -> Result<Option<IntValue<'ctx>>, String> {
@@ -290,9 +290,9 @@ pub fn handle_slice_index_bound<'a, 'ctx, G: CodeGenerator>(
 /// This function handles 'end' **inclusively**.
 /// Order of tuples assign_idx and value_idx is ('start', 'end', 'step').
 /// Negative index should be handled before entering this function
-pub fn list_slice_assignment<'ctx, 'a>(
+pub fn list_slice_assignment<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     ty: BasicTypeEnum<'ctx>,
     dest_arr: PointerValue<'ctx>,
     dest_idx: (IntValue<'ctx>, IntValue<'ctx>, IntValue<'ctx>),
@@ -450,9 +450,9 @@ pub fn list_slice_assignment<'ctx, 'a>(
 }
 
 /// Generates a call to `isinf` in IR. Returns an `i1` representing the result.
-pub fn call_isinf<'ctx, 'a>(
+pub fn call_isinf<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &CodeGenContext<'ctx, 'a>,
+    ctx: &CodeGenContext<'ctx, '_>,
     v: FloatValue<'ctx>,
 ) -> IntValue<'ctx> {
     let intrinsic_fn = ctx.module.get_function("__nac3_isinf").unwrap_or_else(|| {
@@ -470,9 +470,9 @@ pub fn call_isinf<'ctx, 'a>(
 }
 
 /// Generates a call to `isnan` in IR. Returns an `i1` representing the result.
-pub fn call_isnan<'ctx, 'a>(
+pub fn call_isnan<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &CodeGenContext<'ctx, 'a>,
+    ctx: &CodeGenContext<'ctx, '_>,
     v: FloatValue<'ctx>,
 ) -> IntValue<'ctx> {
     let intrinsic_fn = ctx.module.get_function("__nac3_isnan").unwrap_or_else(|| {
@@ -490,8 +490,8 @@ pub fn call_isnan<'ctx, 'a>(
 }
 
 /// Generates a call to `gamma` in IR. Returns an `f64` representing the result.
-pub fn call_gamma<'ctx, 'a>(
-    ctx: &CodeGenContext<'ctx, 'a>,
+pub fn call_gamma<'ctx>(
+    ctx: &CodeGenContext<'ctx, '_>,
     v: FloatValue<'ctx>,
 ) -> FloatValue<'ctx> {
     let llvm_f64 = ctx.ctx.f64_type();
@@ -509,8 +509,8 @@ pub fn call_gamma<'ctx, 'a>(
 }
 
 /// Generates a call to `gammaln` in IR. Returns an `f64` representing the result.
-pub fn call_gammaln<'ctx, 'a>(
-    ctx: &CodeGenContext<'ctx, 'a>,
+pub fn call_gammaln<'ctx>(
+    ctx: &CodeGenContext<'ctx, '_>,
     v: FloatValue<'ctx>,
 ) -> FloatValue<'ctx> {
     let llvm_f64 = ctx.ctx.f64_type();
@@ -528,8 +528,8 @@ pub fn call_gammaln<'ctx, 'a>(
 }
 
 /// Generates a call to `j0` in IR. Returns an `f64` representing the result.
-pub fn call_j0<'ctx, 'a>(
-    ctx: &CodeGenContext<'ctx, 'a>,
+pub fn call_j0<'ctx>(
+    ctx: &CodeGenContext<'ctx, '_>,
     v: FloatValue<'ctx>,
 ) -> FloatValue<'ctx> {
     let llvm_f64 = ctx.ctx.f64_type();
diff --git a/nac3core/src/codegen/mod.rs b/nac3core/src/codegen/mod.rs
index f11cce9..ae330c4 100644
--- a/nac3core/src/codegen/mod.rs
+++ b/nac3core/src/codegen/mod.rs
@@ -112,7 +112,7 @@ impl CodeGenTargetMachineOptions {
     ) -> Option<TargetMachine> {
         let triple = TargetTriple::create(self.triple.as_str());
         let target = Target::from_triple(&triple)
-            .expect(format!("could not create target from target triple {}", self.triple).as_str());
+            .unwrap_or_else(|_| panic!("could not create target from target triple {}", self.triple));
 
         target.create_target_machine(
             &triple,
@@ -178,7 +178,7 @@ impl WithCall {
         WithCall { fp }
     }
 
-    pub fn run<'ctx>(&self, m: &Module<'ctx>) {
+    pub fn run(&self, m: &Module) {
         (self.fp)(m)
     }
 }
@@ -327,9 +327,11 @@ impl WorkerRegistry {
         }
 
         let pass_options = PassBuilderOptions::create();
-        let target_machine = self.llvm_options.target.create_target_machine(
-            self.llvm_options.opt_level
-        ).expect(format!("could not create target machine from properties {:?}", self.llvm_options.target).as_str());
+        let target_machine = self
+            .llvm_options
+            .target
+            .create_target_machine(self.llvm_options.opt_level)
+            .unwrap_or_else(|| panic!("could not create target machine from properties {:?}", self.llvm_options.target));
         let passes = format!("default<O{}>", self.llvm_options.opt_level as u32);
         let result = module.run_passes(passes.as_str(), &target_machine, pass_options);
         if let Err(err) = result {
@@ -500,17 +502,17 @@ fn get_llvm_abi_type<'ctx>(
     }
 }
 
-fn need_sret<'ctx>(ctx: &'ctx Context, ty: BasicTypeEnum<'ctx>) -> bool {
-    fn need_sret_impl<'ctx>(ctx: &'ctx Context, ty: BasicTypeEnum<'ctx>, maybe_large: bool) -> bool {
+fn need_sret(ty: BasicTypeEnum) -> bool {
+    fn need_sret_impl(ty: BasicTypeEnum, maybe_large: bool) -> bool {
         match ty {
             BasicTypeEnum::IntType(_) | BasicTypeEnum::PointerType(_) => false,
             BasicTypeEnum::FloatType(_) if maybe_large => false,
             BasicTypeEnum::StructType(ty) if maybe_large && ty.count_fields() <= 2 =>
-                ty.get_field_types().iter().any(|ty| need_sret_impl(ctx, *ty, false)),
+                ty.get_field_types().iter().any(|ty| need_sret_impl(*ty, false)),
             _ => true,
         }
     }
-    need_sret_impl(ctx, ty, true)
+    need_sret_impl(ty, true)
 }
 
 /// Implementation for generating LLVM IR for a function.
@@ -631,7 +633,7 @@ pub fn gen_func_impl<'ctx, G: CodeGenerator, F: FnOnce(&mut G, &mut CodeGenConte
         Some(get_llvm_abi_type(context, &module, generator, &mut unifier, top_level_ctx.as_ref(), &mut type_cache, &primitives, ret))
     };
 
-    let has_sret = ret_type.map_or(false, |ty| need_sret(context, ty));
+    let has_sret = ret_type.map_or(false, |ty| need_sret(ty));
     let mut params = args
         .iter()
         .map(|arg| {
@@ -704,7 +706,7 @@ pub fn gen_func_impl<'ctx, G: CodeGenerator, F: FnOnce(&mut G, &mut CodeGenConte
             let param_val = param.into_int_value();
 
             if expected_ty.get_bit_width() == 8 && param_val.get_type().get_bit_width() == 1 {
-                bool_to_i8(&builder, &context, param_val)
+                bool_to_i8(&builder, context, param_val)
             } else {
                 param_val
             }.into()
@@ -914,8 +916,8 @@ fn bool_to_i8<'ctx>(
 /// ```
 ///
 /// Returns an `i1` [IntValue] representing the result of whether the `value` is in the range.
-fn gen_in_range_check<'ctx, 'a>(
-    ctx: &CodeGenContext<'ctx, 'a>,
+fn gen_in_range_check<'ctx>(
+    ctx: &CodeGenContext<'ctx, '_>,
     value: IntValue<'ctx>,
     stop: IntValue<'ctx>,
     step: IntValue<'ctx>,
diff --git a/nac3core/src/codegen/stmt.rs b/nac3core/src/codegen/stmt.rs
index 9809cae..a0d6b19 100644
--- a/nac3core/src/codegen/stmt.rs
+++ b/nac3core/src/codegen/stmt.rs
@@ -25,8 +25,8 @@ use nac3parser::ast::{
 use std::convert::TryFrom;
 
 /// See [CodeGenerator::gen_var_alloc].
-pub fn gen_var<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+pub fn gen_var<'ctx>(
+    ctx: &mut CodeGenContext<'ctx, '_>,
     ty: BasicTypeEnum<'ctx>,
     name: Option<&str>,
 ) -> Result<PointerValue<'ctx>, String> {
@@ -55,9 +55,9 @@ pub fn gen_var<'ctx, 'a>(
 }
 
 /// See [CodeGenerator::gen_store_target].
-pub fn gen_store_target<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_store_target<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     pattern: &Expr<Option<Type>>,
     name: Option<&str>,
 ) -> Result<Option<PointerValue<'ctx>>, String> {
@@ -165,9 +165,9 @@ pub fn gen_store_target<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_assign].
-pub fn gen_assign<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_assign<'ctx, G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     target: &Expr<Option<Type>>,
     value: ValueEnum<'ctx>,
 ) -> Result<(), String> {
@@ -219,7 +219,7 @@ pub fn gen_assign<'ctx, 'a, G: CodeGenerator>(
         }
         _ => {
             let name = if let ExprKind::Name { id, .. } = &target.node {
-                format!("{}.addr", id.to_string())
+                format!("{}.addr", id)
             } else {
                 String::from("target.addr")
             };
@@ -242,9 +242,9 @@ pub fn gen_assign<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_for].
-pub fn gen_for<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_for<G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'_, '_>,
     stmt: &Stmt<Option<Type>>,
 ) -> Result<(), String> {
     if let StmtKind::For { iter, target, body, orelse, .. } = &stmt.node {
@@ -403,9 +403,9 @@ pub fn gen_for<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_while].
-pub fn gen_while<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_while<G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'_, '_>,
     stmt: &Stmt<Option<Type>>,
 ) -> Result<(), String> {
     if let StmtKind::While { test, body, orelse, .. } = &stmt.node {
@@ -472,9 +472,9 @@ pub fn gen_while<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_if].
-pub fn gen_if<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_if<G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'_, '_>,
     stmt: &Stmt<Option<Type>>,
 ) -> Result<(), String> {
     if let StmtKind::If { test, body, orelse, .. } = &stmt.node {
@@ -541,8 +541,8 @@ pub fn gen_if<'ctx, 'a, G: CodeGenerator>(
     Ok(())
 }
 
-pub fn final_proxy<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+pub fn final_proxy<'ctx>(
+    ctx: &mut CodeGenContext<'ctx, '_>,
     target: BasicBlock<'ctx>,
     block: BasicBlock<'ctx>,
     final_data: &mut (PointerValue, Vec<BasicBlock<'ctx>>, Vec<BasicBlock<'ctx>>),
@@ -560,9 +560,9 @@ pub fn final_proxy<'ctx, 'a>(
 
 /// Inserts the declaration of the builtin function with the specified `symbol` name, and returns
 /// the function.
-pub fn get_builtins<'ctx, 'a>(
+pub fn get_builtins<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     symbol: &str,
 ) -> FunctionValue<'ctx> {
     ctx.module.get_function(symbol).unwrap_or_else(|| {
@@ -586,8 +586,8 @@ pub fn get_builtins<'ctx, 'a>(
     })
 }
 
-pub fn exn_constructor<'ctx, 'a>(
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+pub fn exn_constructor<'ctx>(
+    ctx: &mut CodeGenContext<'ctx, '_>,
     obj: Option<(Type, ValueEnum<'ctx>)>,
     _fun: (&FunSignature, DefinitionId),
     mut args: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
@@ -661,9 +661,9 @@ pub fn exn_constructor<'ctx, 'a>(
 ///
 /// * `exception` - The exception thrown by the `raise` statement.
 /// * `loc` - The location where the exception is raised from.
-pub fn gen_raise<'ctx, 'a>(
+pub fn gen_raise<'ctx>(
     generator: &mut dyn CodeGenerator,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'ctx, '_>,
     exception: Option<&BasicValueEnum<'ctx>>,
     loc: Location,
 ) {
@@ -1035,9 +1035,9 @@ pub fn gen_try<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// See [CodeGenerator::gen_with].
-pub fn gen_with<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_with<G: CodeGenerator>(
     _: &mut G,
-    _: &mut CodeGenContext<'ctx, 'a>,
+    _: &mut CodeGenContext<'_, '_>,
     stmt: &Stmt<Option<Type>>,
 ) -> Result<(), String> {
     // TODO: Implement with statement after finishing exceptions
@@ -1045,9 +1045,9 @@ pub fn gen_with<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// Generates IR for a `return` statement.
-pub fn gen_return<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_return<G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'_, '_>,
     value: &Option<Box<Expr<Option<Type>>>>,
 ) -> Result<(), String> {
     let func = ctx.builder.get_insert_block().and_then(|bb| bb.get_parent()).unwrap();
@@ -1091,15 +1091,15 @@ pub fn gen_return<'ctx, 'a, G: CodeGenerator>(
             }
         });
         let value = value.as_ref().map(|v| v as &dyn BasicValue);
-        ctx.builder.build_return(value.into());
+        ctx.builder.build_return(value);
     }
     Ok(())
 }
 
 /// See [CodeGenerator::gen_stmt].
-pub fn gen_stmt<'ctx, 'a, G: CodeGenerator>(
+pub fn gen_stmt<G: CodeGenerator>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'_, '_>,
     stmt: &Stmt<Option<Type>>,
 ) -> Result<(), String> {
     ctx.current_loc = stmt.location;
@@ -1193,9 +1193,9 @@ pub fn gen_stmt<'ctx, 'a, G: CodeGenerator>(
 }
 
 /// Generates IR for a block statement contains `stmts`.
-pub fn gen_block<'ctx, 'a, 'b, G: CodeGenerator, I: Iterator<Item = &'b Stmt<Option<Type>>>>(
+pub fn gen_block<'a, G: CodeGenerator, I: Iterator<Item = &'a Stmt<Option<Type>>>>(
     generator: &mut G,
-    ctx: &mut CodeGenContext<'ctx, 'a>,
+    ctx: &mut CodeGenContext<'_, '_>,
     stmts: I,
 ) -> Result<(), String> {
     for stmt in stmts {
diff --git a/nac3core/src/symbol_resolver.rs b/nac3core/src/symbol_resolver.rs
index b89c50a..25a9a53 100644
--- a/nac3core/src/symbol_resolver.rs
+++ b/nac3core/src/symbol_resolver.rs
@@ -70,19 +70,19 @@ impl SymbolValue {
             Constant::Int(i) => {
                 if unifier.unioned(expected_ty, primitives.int32) {
                     i32::try_from(*i)
-                        .map(|val| SymbolValue::I32(val))
+                        .map(SymbolValue::I32)
                         .map_err(|e| e.to_string())
                 } else if unifier.unioned(expected_ty, primitives.int64) {
                     i64::try_from(*i)
-                        .map(|val| SymbolValue::I64(val))
+                        .map(SymbolValue::I64)
                         .map_err(|e| e.to_string())
                 } else if unifier.unioned(expected_ty, primitives.uint32) {
                     u32::try_from(*i)
-                        .map(|val| SymbolValue::U32(val))
+                        .map(SymbolValue::U32)
                         .map_err(|e| e.to_string())
                 } else if unifier.unioned(expected_ty, primitives.uint64) {
                     u64::try_from(*i)
-                        .map(|val| SymbolValue::U64(val))
+                        .map(SymbolValue::U64)
                         .map_err(|e| e.to_string())
                 } else {
                     Err(format!("Expected {}, but got int", unifier.stringify(expected_ty)))
@@ -96,7 +96,8 @@ impl SymbolValue {
 
                 assert_eq!(ty.len(), t.len());
 
-                let elems = t.into_iter()
+                let elems = t
+                    .iter()
                     .zip(ty)
                     .map(|(constant, ty)| Self::from_constant(constant, *ty, primitives, unifier))
                     .collect::<Result<Vec<SymbolValue>, _>>()?;
@@ -204,25 +205,25 @@ pub trait StaticValue {
     /// Returns a unique identifier for this value.
     fn get_unique_identifier(&self) -> u64;
 
-    fn get_const_obj<'ctx, 'a>(
+    fn get_const_obj<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         generator: &mut dyn CodeGenerator,
     ) -> BasicValueEnum<'ctx>;
 
     /// Converts this value to a LLVM [BasicValueEnum].
-    fn to_basic_value_enum<'ctx, 'a>(
+    fn to_basic_value_enum<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         generator: &mut dyn CodeGenerator,
         expected_ty: Type,
     ) -> Result<BasicValueEnum<'ctx>, String>;
 
     /// Returns a field within this value.
-    fn get_field<'ctx, 'a>(
+    fn get_field<'ctx>(
         &self,
         name: StrRef,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
     ) -> Option<ValueEnum<'ctx>>;
 
     /// Returns a single element of this tuple.
@@ -292,10 +293,10 @@ pub trait SymbolResolver {
     // get the top-level definition of identifiers
     fn get_identifier_def(&self, str: StrRef) -> Result<DefinitionId, String>;
 
-    fn get_symbol_value<'ctx, 'a>(
+    fn get_symbol_value<'ctx>(
         &self,
         str: StrRef,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
     ) -> Option<ValueEnum<'ctx>>;
 
     fn get_default_param_value(&self, expr: &Expr) -> Option<SymbolValue>;
diff --git a/nac3core/src/toplevel/builtins.rs b/nac3core/src/toplevel/builtins.rs
index b0648ee..341ee13 100644
--- a/nac3core/src/toplevel/builtins.rs
+++ b/nac3core/src/toplevel/builtins.rs
@@ -117,7 +117,7 @@ fn create_fn_by_codegen(
                 ty: p.0,
                 default_value: None,
             }).collect(),
-            ret: ret_ty.clone(),
+            ret: ret_ty,
             vars: var_map.clone(),
         })),
         var_id: Default::default(),
@@ -163,14 +163,14 @@ fn create_fn_by_intrinsic(
             let args_val = args_ty.iter().zip_eq(args.iter())
                 .map(|(ty, arg)| {
                     arg.1.clone()
-                        .to_basic_value_enum(ctx, generator, ty.clone())
+                        .to_basic_value_enum(ctx, generator, *ty)
                         .unwrap()
                 })
                 .map_into::<BasicMetadataValueEnum>()
                 .collect_vec();
 
             let intrinsic_fn = ctx.module.get_function(intrinsic_fn).unwrap_or_else(|| {
-                let ret_llvm_ty = ctx.get_llvm_abi_type(generator, ret_ty.clone());
+                let ret_llvm_ty = ctx.get_llvm_abi_type(generator, ret_ty);
                 let param_llvm_ty = param_tys.iter()
                     .map(|p| ctx.get_llvm_abi_type(generator, *p))
                     .map_into::<BasicMetadataTypeEnum>()
@@ -229,14 +229,14 @@ fn create_fn_by_extern(
             let args_val = args_ty.iter().zip_eq(args.iter())
                 .map(|(ty, arg)| {
                     arg.1.clone()
-                        .to_basic_value_enum(ctx, generator, ty.clone())
+                        .to_basic_value_enum(ctx, generator, *ty)
                         .unwrap()
                 })
                 .map_into::<BasicMetadataValueEnum>()
                 .collect_vec();
 
                 let intrinsic_fn = ctx.module.get_function(extern_fn).unwrap_or_else(|| {
-                    let ret_llvm_ty = ctx.get_llvm_abi_type(generator, ret_ty.clone());
+                    let ret_llvm_ty = ctx.get_llvm_abi_type(generator, ret_ty);
                     let param_llvm_ty = param_tys.iter()
                         .map(|p| ctx.get_llvm_abi_type(generator, *p))
                         .map_into::<BasicMetadataTypeEnum>()
@@ -684,7 +684,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                             "conv"
                         );
 
-                        val.into()
+                        val
                     } else {
                         unreachable!();
                     };
@@ -760,7 +760,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                             "conv"
                         );
 
-                        val.into()
+                        val
                     } else {
                         unreachable!();
                     };
@@ -905,7 +905,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                     .try_as_basic_value()
                     .left()
                     .unwrap();
-                Ok(Some(val.into()))
+                Ok(Some(val))
             }),
         ),
         Arc::new(RwLock::new(TopLevelDef::Function {
@@ -1174,7 +1174,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                     .try_as_basic_value()
                     .left()
                     .unwrap();
-                Ok(Some(val.into()))
+                Ok(Some(val))
             }),
         ),
         create_fn_by_codegen(
@@ -1261,7 +1261,7 @@ pub fn get_builtins(primitives: &mut (PrimitiveStore, Unifier)) -> BuiltinInfo {
                     .try_as_basic_value()
                     .left()
                     .unwrap();
-                Ok(Some(val.into()))
+                Ok(Some(val))
             }),
         ),
         Arc::new(RwLock::new({
diff --git a/nac3core/src/toplevel/composer.rs b/nac3core/src/toplevel/composer.rs
index 781c2ef..f5d2644 100644
--- a/nac3core/src/toplevel/composer.rs
+++ b/nac3core/src/toplevel/composer.rs
@@ -755,7 +755,7 @@ impl TopLevelComposer {
         // unification of previously assigned typevar
         let mut unification_helper = |ty, def| {
             let target_ty =
-                get_type_from_type_annotation_kinds(&temp_def_list, unifier, primitives, &def, &mut subst_list)?;
+                get_type_from_type_annotation_kinds(&temp_def_list, unifier, &def, &mut subst_list)?;
             unifier.unify(ty, target_ty).map_err(|e| e.to_display(unifier).to_string())?;
             Ok(())
         };
@@ -918,7 +918,6 @@ impl TopLevelComposer {
                                 let ty = get_type_from_type_annotation_kinds(
                                     temp_def_list.as_ref(),
                                     unifier,
-                                    primitives_store,
                                     &type_annotation,
                                     &mut None
                                 )?;
@@ -987,7 +986,6 @@ impl TopLevelComposer {
                             get_type_from_type_annotation_kinds(
                                 &temp_def_list,
                                 unifier,
-                                primitives_store,
                                 &return_ty_annotation,
                                 &mut None
                             )?
@@ -1545,7 +1543,6 @@ impl TopLevelComposer {
                 let self_type = get_type_from_type_annotation_kinds(
                     &def_list,
                     unifier,
-                    primitives_ty,
                     &make_self_type_annotation(type_vars, *object_id),
                     &mut None
                 )?;
@@ -1714,7 +1711,6 @@ impl TopLevelComposer {
                                 let self_ty = get_type_from_type_annotation_kinds(
                                     &def_list,
                                     unifier,
-                                    primitives_ty,
                                     &ty_ann,
                                     &mut None
                                 )?;
@@ -1737,8 +1733,8 @@ impl TopLevelComposer {
                     let (type_var_subst_comb, no_range_vars) = {
                         let mut no_ranges: Vec<Type> = Vec::new();
                         let var_combs = vars
-                            .iter()
-                            .map(|(_, ty)| {
+                            .values()
+                            .map(|ty| {
                                 unifier.get_instantiations(*ty).unwrap_or_else(|| {
                                     if let TypeEnum::TVar { name, loc, is_const_generic: false, .. } = &*unifier.get_ty(*ty)
                                     {
diff --git a/nac3core/src/toplevel/mod.rs b/nac3core/src/toplevel/mod.rs
index 5e5c7a7..6b95662 100644
--- a/nac3core/src/toplevel/mod.rs
+++ b/nac3core/src/toplevel/mod.rs
@@ -53,9 +53,9 @@ impl GenCall {
         GenCall { fp }
     }
 
-    pub fn run<'ctx, 'a>(
+    pub fn run<'ctx>(
         &self,
-        ctx: &mut CodeGenContext<'ctx, 'a>,
+        ctx: &mut CodeGenContext<'ctx, '_>,
         obj: Option<(Type, ValueEnum<'ctx>)>,
         fun: (&FunSignature, DefinitionId),
         args: Vec<(Option<StrRef>, ValueEnum<'ctx>)>,
diff --git a/nac3core/src/toplevel/type_annotation.rs b/nac3core/src/toplevel/type_annotation.rs
index 0d7063f..3020abb 100644
--- a/nac3core/src/toplevel/type_annotation.rs
+++ b/nac3core/src/toplevel/type_annotation.rs
@@ -146,7 +146,7 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
          slice: &ast::Expr<T>,
          unifier: &mut Unifier,
          mut locked: HashMap<DefinitionId, Vec<Type>>| {
-            if vec!["virtual".into(), "Generic".into(), "list".into(), "tuple".into(), "Option".into()].contains(id)
+            if ["virtual".into(), "Generic".into(), "list".into(), "tuple".into(), "Option".into()].contains(id)
             {
                 return Err(format!("keywords cannot be class name (at {})", expr.location));
             }
@@ -329,8 +329,7 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
 
             if matches!(value, SymbolValue::Str(_) | SymbolValue::Tuple(_) | SymbolValue::OptionSome(_)) {
                 return Err(format!(
-                    "expression {} is not allowed for constant type annotation (at {})",
-                    value.to_string(),
+                    "expression {value} is not allowed for constant type annotation (at {})",
                     expr.location
                 ))
             }
@@ -351,7 +350,6 @@ pub fn parse_ast_to_type_annotation_kinds<T>(
 pub fn get_type_from_type_annotation_kinds(
     top_level_defs: &[Arc<RwLock<TopLevelDef>>],
     unifier: &mut Unifier,
-    primitives: &PrimitiveStore,
     ann: &TypeAnnotation,
     subst_list: &mut Option<Vec<Type>>
 ) -> Result<Type, String> {
@@ -371,18 +369,17 @@ pub fn get_type_from_type_annotation_kinds(
                 ))
             }
 
-            let param_ty = params
-                .iter()
-                .map(|x| {
-                    get_type_from_type_annotation_kinds(
-                        top_level_defs,
-                        unifier,
-                        primitives,
-                        x,
-                        subst_list
-                    )
-                })
-                .collect::<Result<Vec<_>, _>>()?;
+                    let param_ty = params
+                        .iter()
+                        .map(|x| {
+                            get_type_from_type_annotation_kinds(
+                                top_level_defs,
+                                unifier,
+                                x,
+                                subst_list
+                            )
+                        })
+                        .collect::<Result<Vec<_>, _>>()?;
 
             let subst = {
                 // check for compatible range
@@ -466,7 +463,9 @@ pub fn get_type_from_type_annotation_kinds(
                 params: subst,
             });
             if need_subst {
-                subst_list.as_mut().map(|wl| wl.push(ty));
+                if let Some(wl) = subst_list.as_mut() {
+                    wl.push(ty);
+                }
             }
             Ok(ty)
         }
@@ -487,7 +486,6 @@ pub fn get_type_from_type_annotation_kinds(
             let ty = get_type_from_type_annotation_kinds(
                 top_level_defs,
                 unifier,
-                primitives,
                 ty.as_ref(),
                 subst_list
             )?;
@@ -497,7 +495,6 @@ pub fn get_type_from_type_annotation_kinds(
             let ty = get_type_from_type_annotation_kinds(
                 top_level_defs,
                 unifier,
-                primitives,
                 ty.as_ref(),
                 subst_list
             )?;
@@ -507,7 +504,7 @@ pub fn get_type_from_type_annotation_kinds(
             let tys = tys
                 .iter()
                 .map(|x| {
-                    get_type_from_type_annotation_kinds(top_level_defs, unifier, primitives, x, subst_list)
+                    get_type_from_type_annotation_kinds(top_level_defs, unifier, x, subst_list)
                 })
                 .collect::<Result<Vec<_>, _>>()?;
             Ok(unifier.add_ty(TypeEnum::TTuple { ty: tys }))
diff --git a/nac3core/src/typecheck/typedef/mod.rs b/nac3core/src/typecheck/typedef/mod.rs
index a503741..04d8df5 100644
--- a/nac3core/src/typecheck/typedef/mod.rs
+++ b/nac3core/src/typecheck/typedef/mod.rs
@@ -394,8 +394,7 @@ impl Unifier {
                     Some(
                         range
                             .iter()
-                            .map(|ty| self.get_instantiations(*ty).unwrap_or_else(|| vec![*ty]))
-                            .flatten()
+                            .flat_map(|ty| self.get_instantiations(*ty).unwrap_or_else(|| vec![*ty]))
                             .collect_vec(),
                     )
                 }
@@ -492,11 +491,11 @@ impl Unifier {
         }
 
         let Call { posargs, kwargs, ret, fun, loc } = call;
-        let instantiated = self.instantiate_fun(b, &*signature);
+        let instantiated = self.instantiate_fun(b, signature);
         let r = self.get_ty(instantiated);
         let r = r.as_ref();
         let signature;
-        if let TypeEnum::TFunc(s) = &*r {
+        if let TypeEnum::TFunc(s) = r {
             signature = s;
         } else {
             unreachable!();
@@ -1197,7 +1196,7 @@ impl Unifier {
                 }
                 if new_params.is_some() || new_ret.is_some() || matches!(new_args, Cow::Owned(..)) {
                     let params = new_params.unwrap_or_else(|| params.clone());
-                    let ret = new_ret.unwrap_or_else(|| *ret);
+                    let ret = new_ret.unwrap_or(*ret);
                     let args = new_args.into_owned();
                     Some(self.add_ty(TypeEnum::TFunc(FunSignature { args, ret, vars: params })))
                 } else {
@@ -1313,7 +1312,7 @@ impl Unifier {
                     .try_collect()?;
                 if ty.iter().any(Option::is_some) {
                     Ok(Some(self.add_ty(TTuple {
-                        ty: zip(ty.into_iter(), ty1.iter()).map(|(a, b)| a.unwrap_or(*b)).collect(),
+                        ty: zip(ty, ty1.iter()).map(|(a, b)| a.unwrap_or(*b)).collect(),
                     })))
                 } else {
                     Ok(None)
diff --git a/nac3ld/src/dwarf.rs b/nac3ld/src/dwarf.rs
index ff474ff..44df659 100644
--- a/nac3ld/src/dwarf.rs
+++ b/nac3ld/src/dwarf.rs
@@ -41,9 +41,9 @@ impl<'a> DwarfReader<'a> {
     /// offsets previously applied to the other instance.
     pub fn from_reader(other: &DwarfReader<'a>, reset_offset: bool) -> DwarfReader<'a> {
         if reset_offset {
-            DwarfReader::new(&other.base_slice, other.base_virt_addr)
+            DwarfReader::new(other.base_slice, other.base_virt_addr)
         } else {
-            DwarfReader::new(&other.slice, other.virt_addr)
+            DwarfReader::new(other.slice, other.virt_addr)
         }
     }
 
@@ -267,7 +267,7 @@ impl<'a> CFI_Record<'a> {
             0xFFFFFFFF => unimplemented!(),
 
             _ => {
-                let mut fde_reader = DwarfReader::from_reader(&cie_reader, false);
+                let mut fde_reader = DwarfReader::from_reader(cie_reader, false);
                 fde_reader.offset(length);
                 fde_reader
             }
@@ -286,7 +286,7 @@ impl<'a> CFI_Record<'a> {
         // Skip code/data alignment factors & return address register along the way as well
         // We only tackle the case where 'z' and 'R' are part of the augmentation string, otherwise
         // we cannot get the addresses to make .eh_frame_hdr
-        let mut aug_data_reader = DwarfReader::from_reader(&cie_reader, false);
+        let mut aug_data_reader = DwarfReader::from_reader(cie_reader, false);
         let mut aug_str_len = 0;
         loop {
             if aug_data_reader.read_u8() == b'\0' {
diff --git a/nac3ld/src/elf.rs b/nac3ld/src/elf.rs
index bb2d2bf..6bb24f2 100644
--- a/nac3ld/src/elf.rs
+++ b/nac3ld/src/elf.rs
@@ -10,7 +10,7 @@ pub const EI_MAG2: usize = 2;
 pub const ELFMAG2: u8 = b'L';
 pub const EI_MAG3: usize = 3;
 pub const ELFMAG3: u8 = b'F';
-pub const ELFMAG: &'static [u8; 5usize] = b"\x7fELF\x00";
+pub const ELFMAG: &[u8; 5usize] = b"\x7fELF\x00";
 pub const SELFMAG: usize = 4;
 pub const EI_CLASS: usize = 4;
 pub const ELFCLASSNONE: u8 = 0;
@@ -428,8 +428,8 @@ pub const VER_NDX_ELIMINATE: usize = 65281;
 pub const VER_NEED_NONE: usize = 0;
 pub const VER_NEED_CURRENT: usize = 1;
 pub const VER_NEED_NUM: usize = 2;
-pub const ELF_NOTE_SOLARIS: &'static [u8; 13usize] = b"SUNW Solaris\x00";
-pub const ELF_NOTE_GNU: &'static [u8; 4usize] = b"GNU\x00";
+pub const ELF_NOTE_SOLARIS: &[u8; 13usize] = b"SUNW Solaris\x00";
+pub const ELF_NOTE_GNU: &[u8; 4usize] = b"GNU\x00";
 pub const ELF_NOTE_PAGESIZE_HINT: usize = 1;
 pub const NT_GNU_ABI_TAG: usize = 1;
 pub const ELF_NOTE_ABI: usize = 1;
diff --git a/nac3ld/src/lib.rs b/nac3ld/src/lib.rs
index e92ae74..9af041e 100644
--- a/nac3ld/src/lib.rs
+++ b/nac3ld/src/lib.rs
@@ -74,7 +74,7 @@ fn read_unaligned<T: Copy>(data: &[u8], offset: usize) -> Result<T, ()> {
     if data.len() < offset + mem::size_of::<T>() {
         Err(())
     } else {
-        let ptr = data.as_ptr().wrapping_offset(offset as isize) as *const T;
+        let ptr = data.as_ptr().wrapping_add(offset) as *const T;
         Ok(unsafe { ptr::read_unaligned(ptr) })
     }
 }
@@ -83,7 +83,7 @@ pub fn get_ref_slice<T: Copy>(data: &[u8], offset: usize, len: usize) -> Result<
     if data.len() < offset + mem::size_of::<T>() * len {
         Err(())
     } else {
-        let ptr = data.as_ptr().wrapping_offset(offset as isize) as *const T;
+        let ptr = data.as_ptr().wrapping_add(offset) as *const T;
         Ok(unsafe { slice::from_raw_parts(ptr, len) })
     }
 }
@@ -177,7 +177,7 @@ impl<'a> Linker<'a> {
     }
 
     fn load_section(&mut self, shdr: &Elf32_Shdr, sh_name_str: &'a str, data: Vec<u8>) -> usize {
-        let mut elf_shdr = shdr.clone();
+        let mut elf_shdr = *shdr;
 
         // Maintain alignment requirement specified in sh_addralign
         let align = shdr.sh_addralign;
@@ -240,7 +240,7 @@ impl<'a> Linker<'a> {
             let get_target_section_index = || -> Result<usize, Error> {
                 self.section_map
                     .get(&(target_section as usize))
-                    .map(|&index| index)
+                    .copied()
                     .ok_or(Error::Parsing("Cannot find section with matching sh_index"))
             };
 
@@ -314,13 +314,9 @@ impl<'a> Linker<'a> {
 
                         R_RISCV_PCREL_LO12_I => {
                             let expected_offset = sym_option.map_or(0, |sym| sym.st_value);
-                            let indirect_reloc = if let Some(reloc) =
-                                relocs.iter().find(|reloc| reloc.offset() == expected_offset)
-                            {
-                                reloc
-                            } else {
-                                return None;
-                            };
+                            let indirect_reloc = relocs
+                                .iter()
+                                .find(|reloc| reloc.offset() == expected_offset)?;
                             Some(RelocInfo {
                                 defined_val: {
                                     let indirect_sym =
@@ -603,23 +599,24 @@ impl<'a> Linker<'a> {
         // Section table for the .elf paired with the section name
         // To be formalized incrementally
         // Very hashmap-like structure, but the order matters, so it is a vector
-        let mut elf_shdrs = Vec::new();
-        elf_shdrs.push(SectionRecord {
-            shdr: Elf32_Shdr {
-                sh_name: 0,
-                sh_type: 0,
-                sh_flags: 0,
-                sh_addr: 0,
-                sh_offset: 0,
-                sh_size: 0,
-                sh_link: 0,
-                sh_info: 0,
-                sh_addralign: 0,
-                sh_entsize: 0,
+        let elf_shdrs = vec![
+            SectionRecord {
+                shdr: Elf32_Shdr {
+                    sh_name: 0,
+                    sh_type: 0,
+                    sh_flags: 0,
+                    sh_addr: 0,
+                    sh_offset: 0,
+                    sh_size: 0,
+                    sh_link: 0,
+                    sh_info: 0,
+                    sh_addralign: 0,
+                    sh_entsize: 0,
+                },
+                name: "",
+                data: vec![0; 0],
             },
-            name: "",
-            data: vec![0; 0],
-        });
+        ];
         let elf_sh_data_off = mem::size_of::<Elf32_Ehdr>() + mem::size_of::<Elf32_Phdr>() * 5;
 
         // Image of the linked dynamic library, to be formalized incrementally
@@ -659,8 +656,8 @@ impl<'a> Linker<'a> {
         linker.load_section(
             &text_shdr,
             ".text",
-            (&data[text_shdr.sh_offset as usize
-                ..text_shdr.sh_offset as usize + text_shdr.sh_size as usize])
+            data[text_shdr.sh_offset as usize
+                ..text_shdr.sh_offset as usize + text_shdr.sh_size as usize]
                 .to_vec(),
         );
         linker.section_map.insert(text_shdr_index, 1);
@@ -678,8 +675,8 @@ impl<'a> Linker<'a> {
             let loaded_index = linker.load_section(
                 &arm_exidx_shdr,
                 ".ARM.exidx",
-                (&data[arm_exidx_shdr.sh_offset as usize
-                    ..arm_exidx_shdr.sh_offset as usize + arm_exidx_shdr.sh_size as usize])
+                data[arm_exidx_shdr.sh_offset as usize
+                    ..arm_exidx_shdr.sh_offset as usize + arm_exidx_shdr.sh_size as usize]
                     .to_vec(),
             );
             linker.section_map.insert(arm_exidx_shdr_index, loaded_index);
@@ -698,7 +695,7 @@ impl<'a> Linker<'a> {
             let elf_shdrs_index = linker.load_section(
                 shdr,
                 str::from_utf8(section_name).unwrap(),
-                (&data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize]).to_vec(),
+                data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize].to_vec(),
             );
             linker.section_map.insert(i, elf_shdrs_index);
         }
@@ -918,7 +915,7 @@ impl<'a> Linker<'a> {
         dynsym_names.push((0, 0));
 
         for rela_dyn_sym_index in rela_dyn_sym_indices {
-            let mut sym = linker.symtab[rela_dyn_sym_index as usize].clone();
+            let mut sym = linker.symtab[rela_dyn_sym_index as usize];
             let sym_name = name_starting_at_slice(strtab, sym.st_name as usize)
                 .map_err(|_| "cannot read symbol name from the original .strtab")?;
             let dynstr_start_index = dynstr.len();
@@ -928,7 +925,7 @@ impl<'a> Linker<'a> {
                 let elf_shdr_index = linker
                     .section_map
                     .get(&(sym.st_shndx as usize))
-                    .map(|&index| index)
+                    .copied()
                     .ok_or(Error::Parsing("Cannot find section with matching sh_index"))?;
                 let elf_shdr_offset = linker.elf_shdrs[elf_shdr_index].shdr.sh_offset;
                 sym.st_value += elf_shdr_offset;
@@ -955,7 +952,7 @@ impl<'a> Linker<'a> {
         let modinit_shdr_index = linker
             .section_map
             .get(&(modinit_sym.st_shndx as usize))
-            .map(|&index| index)
+            .copied()
             .ok_or(Error::Parsing("Cannot find section with matching sh_index"))?;
         let modinit_shdr = linker.elf_shdrs[modinit_shdr_index].shdr;
 
@@ -1013,9 +1010,8 @@ impl<'a> Linker<'a> {
         let mut hash_bucket: Vec<u32> = vec![0; dynsym.len()];
         let mut hash_chain: Vec<u32> = vec![0; dynsym.len()];
 
-        for sym_index in 1..dynsym.len() {
-            let (str_start, str_end) = dynsym_names[sym_index];
-            let hash = elf_hash(&dynstr[str_start..str_end]);
+        for (sym_index, (str_start, str_end)) in dynsym_names.iter().enumerate().take(dynsym.len()).skip(1) {
+            let hash = elf_hash(&dynstr[*str_start..*str_end]);
             let mut hash_index = hash as usize % hash_bucket.len();
 
             if hash_bucket[hash_index] == 0 {
@@ -1104,7 +1100,7 @@ impl<'a> Linker<'a> {
                 let elf_shdrs_index = linker.load_section(
                     shdr,
                     str::from_utf8(section_name).unwrap(),
-                    (&data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize])
+                    data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize]
                         .to_vec(),
                 );
                 linker.section_map.insert(i, elf_shdrs_index);
@@ -1208,7 +1204,7 @@ impl<'a> Linker<'a> {
                     let elf_shdrs_index = linker.load_section(
                         shdr,
                         section_name,
-                        (&data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize])
+                        data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize]
                             .to_vec(),
                     );
                     linker.section_map.insert(i, elf_shdrs_index);
@@ -1262,7 +1258,7 @@ impl<'a> Linker<'a> {
                 let bss_elf_index = linker.load_section(
                     shdr,
                     section_name,
-                    (&data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize])
+                    data[shdr.sh_offset as usize..(shdr.sh_offset + shdr.sh_size) as usize]
                         .to_vec(),
                 );
                 linker.section_map.insert(bss_section_index, bss_elf_index);
diff --git a/nac3standalone/src/basic_symbol_resolver.rs b/nac3standalone/src/basic_symbol_resolver.rs
index 2559b6f..9cb8ab3 100644
--- a/nac3standalone/src/basic_symbol_resolver.rs
+++ b/nac3standalone/src/basic_symbol_resolver.rs
@@ -53,10 +53,10 @@ impl SymbolResolver for Resolver {
         self.0.id_to_type.lock().get(&str).cloned().ok_or(format!("cannot get type of {}", str))
     }
 
-    fn get_symbol_value<'ctx, 'a>(
+    fn get_symbol_value<'ctx>(
         &self,
         _: StrRef,
-        _: &mut CodeGenContext<'ctx, 'a>,
+        _: &mut CodeGenContext<'ctx, '_>,
     ) -> Option<ValueEnum<'ctx>> {
         unimplemented!()
     }
diff --git a/nac3standalone/src/main.rs b/nac3standalone/src/main.rs
index 8faed58..4b69be7 100644
--- a/nac3standalone/src/main.rs
+++ b/nac3standalone/src/main.rs
@@ -102,7 +102,7 @@ fn handle_typevar_definition(
                         None,
                     )?;
                     get_type_from_type_annotation_kinds(
-                        def_list, unifier, primitives, &ty, &mut None
+                        def_list, unifier, &ty, &mut None
                     )
                 })
                 .collect::<Result<Vec<_>, _>>()?;
@@ -138,7 +138,7 @@ fn handle_typevar_definition(
                 None,
             )?;
             let constraint = get_type_from_type_annotation_kinds(
-                def_list, unifier, primitives, &ty, &mut None
+                def_list, unifier, &ty, &mut None
             )?;
             let loc = func.location;