diff --git a/.travis.yml b/.travis.yml
index f072af9a..e99c4891 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -12,7 +12,7 @@ git:
 
 _defaults: &defaults
   before_install:
-  - rustup component add rustfmt
+  - rustup component add rustfmt clippy
   - nvm install $NODE_VERSION
   - sudo apt-get install -y pkg-config build-essential libudev-dev
 
@@ -41,6 +41,7 @@ jobs:
       script:
         - cargo build
         - cargo fmt -- --check
+        - cargo clippy --all-targets -- -D warnings
         - cargo test
     - <<: *examples
       name: Runs the examples 1
diff --git a/Cargo.lock b/Cargo.lock
index c9d1780c..f9b3237b 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -1087,9 +1087,9 @@ checksum = "835a3dc7d1ec9e75e2b5fb4ba75396837112d2060b03f7d43bc1897c7f7211da"
 
 [[package]]
 name = "field-offset"
-version = "0.3.3"
+version = "0.3.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "cf539fba70056b50f40a22e0da30639518a12ee18c35807858a63b158cb6dde7"
+checksum = "1e1c54951450cbd39f3dbcf1005ac413b49487dabf18a720ad2383eccfeffb92"
 dependencies = [
  "memoffset 0.6.1",
  "rustc_version 0.3.3",
diff --git a/cli/src/config.rs b/cli/src/config.rs
index 0e56bc0e..5dbcab93 100644
--- a/cli/src/config.rs
+++ b/cli/src/config.rs
@@ -118,7 +118,7 @@ impl ToString for Config {
     fn to_string(&self) -> String {
         let clusters = {
             let c = ser_clusters(&self.clusters);
-            if c.len() == 0 {
+            if c.is_empty() {
                 None
             } else {
                 Some(c)
@@ -152,11 +152,9 @@ impl FromStr for Config {
                 cluster: cfg.provider.cluster.parse()?,
                 wallet: shellexpand::tilde(&cfg.provider.wallet).parse()?,
             },
-            scripts: cfg.scripts.unwrap_or_else(|| BTreeMap::new()),
+            scripts: cfg.scripts.unwrap_or_else(BTreeMap::new),
             test: cfg.test,
-            clusters: cfg
-                .clusters
-                .map_or(Ok(BTreeMap::new()), |c| deser_clusters(c))?,
+            clusters: cfg.clusters.map_or(Ok(BTreeMap::new()), deser_clusters)?,
         })
     }
 }
diff --git a/cli/src/main.rs b/cli/src/main.rs
index ae23e12d..cc8c5ecd 100644
--- a/cli/src/main.rs
+++ b/cli/src/main.rs
@@ -311,7 +311,7 @@ fn init(cfg_override: &ConfigOverride, name: String, typescript: bool) -> Result
         ts_config.write_all(template::ts_config().as_bytes())?;
 
         let mut deploy = File::create("migrations/deploy.ts")?;
-        deploy.write_all(&template::ts_deploy_script().as_bytes())?;
+        deploy.write_all(template::ts_deploy_script().as_bytes())?;
 
         let mut mocha = File::create(&format!("tests/{}.spec.ts", name))?;
         mocha.write_all(template::ts_mocha(&name).as_bytes())?;
@@ -320,7 +320,7 @@ fn init(cfg_override: &ConfigOverride, name: String, typescript: bool) -> Result
         mocha.write_all(template::mocha(&name).as_bytes())?;
 
         let mut deploy = File::create("migrations/deploy.js")?;
-        deploy.write_all(&template::deploy_script().as_bytes())?;
+        deploy.write_all(template::deploy_script().as_bytes())?;
     }
 
     println!("{} initialized", name);
@@ -350,11 +350,11 @@ fn new_program(name: &str) -> Result<()> {
     fs::create_dir(&format!("programs/{}", name))?;
     fs::create_dir(&format!("programs/{}/src/", name))?;
     let mut cargo_toml = File::create(&format!("programs/{}/Cargo.toml", name))?;
-    cargo_toml.write_all(template::cargo_toml(&name).as_bytes())?;
+    cargo_toml.write_all(template::cargo_toml(name).as_bytes())?;
     let mut xargo_toml = File::create(&format!("programs/{}/Xargo.toml", name))?;
     xargo_toml.write_all(template::xargo_toml().as_bytes())?;
     let mut lib_rs = File::create(&format!("programs/{}/src/lib.rs", name))?;
-    lib_rs.write_all(template::lib_rs(&name).as_bytes())?;
+    lib_rs.write_all(template::lib_rs(name).as_bytes())?;
     Ok(())
 }
 
@@ -458,7 +458,7 @@ fn build_cwd_verifiable(workspace_dir: &Path) -> Result<()> {
         .args(&[
             "run",
             "--name",
-            &container_name,
+            container_name,
             "-v",
             &volume_mount,
             &image_name,
@@ -504,7 +504,7 @@ fn build_cwd_verifiable(workspace_dir: &Path) -> Result<()> {
 
     // Remove the docker image.
     let exit = std::process::Command::new("docker")
-        .args(&["rm", &container_name])
+        .args(&["rm", container_name])
         .stdout(Stdio::inherit())
         .stderr(Stdio::inherit())
         .output()
@@ -540,7 +540,7 @@ fn _build_cwd(idl_out: Option<PathBuf>) -> Result<()> {
 
 fn verify(cfg_override: &ConfigOverride, program_id: Pubkey) -> Result<()> {
     let (cfg, _path, cargo) = Config::discover(cfg_override)?.expect("Not in workspace.");
-    let cargo = cargo.ok_or(anyhow!("Must be inside program subdirectory."))?;
+    let cargo = cargo.ok_or_else(|| anyhow!("Must be inside program subdirectory."))?;
     let program_dir = cargo.parent().unwrap();
 
     // Build the program we want to verify.
@@ -692,7 +692,7 @@ fn idl_init(cfg_override: &ConfigOverride, program_id: Pubkey, idl_filepath: Str
         let bytes = std::fs::read(idl_filepath)?;
         let idl: Idl = serde_json::from_reader(&*bytes)?;
 
-        let idl_address = create_idl_account(&cfg, &keypair, &program_id, &idl)?;
+        let idl_address = create_idl_account(cfg, &keypair, &program_id, &idl)?;
 
         println!("Idl account created: {:?}", idl_address);
         Ok(())
@@ -710,8 +710,8 @@ fn idl_write_buffer(
         let bytes = std::fs::read(idl_filepath)?;
         let idl: Idl = serde_json::from_reader(&*bytes)?;
 
-        let idl_buffer = create_idl_buffer(&cfg, &keypair, &program_id, &idl)?;
-        idl_write(&cfg, &program_id, &idl, idl_buffer)?;
+        let idl_buffer = create_idl_buffer(cfg, &keypair, &program_id, &idl)?;
+        idl_write(cfg, &program_id, &idl, idl_buffer)?;
 
         println!("Idl buffer created: {:?}", idl_buffer);
 
@@ -988,10 +988,8 @@ fn test(
         //
         // In either case, skip the deploy if the user specifies.
         let is_localnet = cfg.provider.cluster == Cluster::Localnet;
-        if !is_localnet || (is_localnet && skip_local_validator) {
-            if !skip_deploy {
-                deploy(cfg_override, None)?;
-            }
+        if (!is_localnet || skip_local_validator) && !skip_deploy {
+            deploy(cfg_override, None)?;
         }
         // Start local test validator, if needed.
         let mut validator_handle = None;
@@ -1004,7 +1002,7 @@ fn test(
         }
 
         // Setup log reader.
-        let log_streams = stream_logs(&cfg.provider.cluster.url());
+        let log_streams = stream_logs(cfg.provider.cluster.url());
 
         // Run the tests.
         let test_result: Result<_> = {
@@ -1298,7 +1296,7 @@ fn launch(
 ) -> Result<()> {
     // Build and deploy.
     build(cfg_override, None, verifiable, program_name.clone())?;
-    let programs = _deploy(cfg_override, program_name.clone())?;
+    let programs = _deploy(cfg_override, program_name)?;
 
     with_workspace(cfg_override, |cfg, _path, _cargo| {
         let keypair = cfg.provider.wallet.to_string();
@@ -1306,7 +1304,7 @@ fn launch(
         // Add metadata to all IDLs.
         for (address, program) in programs {
             // Store the IDL on chain.
-            let idl_address = create_idl_account(&cfg, &keypair, &address, &program.idl)?;
+            let idl_address = create_idl_account(cfg, &keypair, &address, &program.idl)?;
             println!("IDL account created: {}", idl_address.to_string());
         }
 
@@ -1589,7 +1587,7 @@ fn shell(cfg_override: &ConfigOverride) -> Result<()> {
                 .map(|program| (program.idl.name.clone(), program.idl.clone()))
                 .collect();
             // Insert all manually specified idls into the idl map.
-            cfg.clusters.get(&cfg.provider.cluster).map(|programs| {
+            if let Some(programs) = cfg.clusters.get(&cfg.provider.cluster) {
                 let _ = programs
                     .iter()
                     .map(|(name, pd)| {
@@ -1601,7 +1599,7 @@ fn shell(cfg_override: &ConfigOverride) -> Result<()> {
                         }
                     })
                     .collect::<Vec<_>>();
-            });
+            }
             match cfg.clusters.get(&cfg.provider.cluster) {
                 None => Vec::new(),
                 Some(programs) => programs
@@ -1645,7 +1643,7 @@ fn run(cfg_override: &ConfigOverride, script: String) -> Result<()> {
         let script = cfg
             .scripts
             .get(&script)
-            .ok_or(anyhow!("Unable to find script"))?;
+            .ok_or_else(|| anyhow!("Unable to find script"))?;
         let exit = std::process::Command::new("bash")
             .arg("-c")
             .arg(&script)
diff --git a/client/src/lib.rs b/client/src/lib.rs
index 36aef29c..025a488a 100644
--- a/client/src/lib.rs
+++ b/client/src/lib.rs
@@ -91,7 +91,7 @@ impl Program {
     pub fn request(&self) -> RequestBuilder {
         RequestBuilder::from(
             self.program_id,
-            &self.cfg.cluster.url(),
+            self.cfg.cluster.url(),
             Keypair::from_bytes(&self.cfg.payer.to_bytes()).unwrap(),
             self.cfg.options,
             RequestNamespace::Global,
@@ -102,7 +102,7 @@ impl Program {
     pub fn state_request(&self) -> RequestBuilder {
         RequestBuilder::from(
             self.program_id,
-            &self.cfg.cluster.url(),
+            self.cfg.cluster.url(),
             Keypair::from_bytes(&self.cfg.payer.to_bytes()).unwrap(),
             self.cfg.options,
             RequestNamespace::State { new: false },
@@ -140,7 +140,7 @@ impl Program {
 
     pub fn on<T: anchor_lang::Event + anchor_lang::AnchorDeserialize>(
         &self,
-        f: impl Fn(&EventContext, T) -> () + Send + 'static,
+        f: impl Fn(&EventContext, T) + Send + 'static,
     ) -> Result<EventHandle, ClientError> {
         let addresses = vec![self.program_id.to_string()];
         let filter = RpcTransactionLogsFilter::Mentions(addresses);
@@ -149,7 +149,7 @@ impl Program {
             commitment: self.cfg.options,
         };
         let self_program_str = self.program_id.to_string();
-        let (client, receiver) = PubsubClient::logs_subscribe(&ws_url, filter.clone(), cfg)?;
+        let (client, receiver) = PubsubClient::logs_subscribe(&ws_url, filter, cfg)?;
         std::thread::spawn(move || {
             loop {
                 match receiver.recv() {
@@ -159,23 +159,24 @@ impl Program {
                             slot: logs.context.slot,
                         };
                         let mut logs = &logs.value.logs[..];
-                        if logs.len() > 0 {
+                        if !logs.is_empty() {
                             if let Ok(mut execution) = Execution::new(&mut logs) {
                                 for l in logs {
                                     // Parse the log.
                                     let (event, new_program, did_pop) = {
                                         if self_program_str == execution.program() {
-                                            handle_program_log(&self_program_str, &l)
-                                                .unwrap_or_else(|e| {
+                                            handle_program_log(&self_program_str, l).unwrap_or_else(
+                                                |e| {
                                                     println!(
                                                         "Unable to parse log: {}",
                                                         e.to_string()
                                                     );
                                                     std::process::exit(1);
-                                                })
+                                                },
+                                            )
                                         } else {
                                             let (program, did_pop) =
-                                                handle_system_log(&self_program_str, &l);
+                                                handle_system_log(&self_program_str, l);
                                             (None, program, did_pop)
                                         }
                                     };
@@ -232,7 +233,7 @@ fn handle_program_log<T: anchor_lang::Event + anchor_lang::AnchorDeserialize>(
     }
     // System log.
     else {
-        let (program, did_pop) = handle_system_log(&self_program_str, &l);
+        let (program, did_pop) = handle_system_log(self_program_str, l);
         Ok((None, program, did_pop))
     }
 }
@@ -264,10 +265,10 @@ impl Execution {
         let re = Regex::new(r"^Program (.*) invoke.*$").unwrap();
         let c = re
             .captures(l)
-            .ok_or(ClientError::LogParseError(l.to_string()))?;
+            .ok_or_else(|| ClientError::LogParseError(l.to_string()))?;
         let program = c
             .get(1)
-            .ok_or(ClientError::LogParseError(l.to_string()))?
+            .ok_or_else(|| ClientError::LogParseError(l.to_string()))?
             .as_str()
             .to_string();
         Ok(Self {
@@ -276,7 +277,7 @@ impl Execution {
     }
 
     pub fn program(&self) -> String {
-        assert!(self.stack.len() > 0);
+        assert!(!self.stack.is_empty());
         self.stack[self.stack.len() - 1].clone()
     }
 
@@ -285,7 +286,7 @@ impl Execution {
     }
 
     pub fn pop(&mut self) {
-        assert!(self.stack.len() > 0);
+        assert!(!self.stack.is_empty());
         self.stack.pop().unwrap();
     }
 }
@@ -394,6 +395,7 @@ impl<'a> RequestBuilder<'a> {
     }
 
     /// Invokes the `#[state]`'s `new` constructor.
+    #[allow(clippy::wrong_self_convention)]
     pub fn new(mut self, args: impl InstructionData) -> Self {
         assert!(self.namespace == RequestNamespace::State { new: false });
         self.namespace = RequestNamespace::State { new: true };
@@ -483,7 +485,7 @@ mod tests {
         let log = "Program 7Y8VDzehoewALqJfyxZYMgYCnMTCDhWuGfJKUvjYWATw success";
         let (program, did_pop) = handle_system_log("asdf", log);
         assert_eq!(program, None);
-        assert_eq!(did_pop, true);
+        assert!(did_pop);
     }
 
     #[test]
@@ -491,6 +493,6 @@ mod tests {
         let log = "Program 7swsTUiQ6KUK4uFYquQKg4epFRsBnvbrTf2fZQCa2sTJ qwer";
         let (program, did_pop) = handle_system_log("asdf", log);
         assert_eq!(program, None);
-        assert_eq!(did_pop, false);
+        assert!(!did_pop);
     }
 }
diff --git a/lang/attribute/account/src/lib.rs b/lang/attribute/account/src/lib.rs
index cd721315..0b8baa34 100644
--- a/lang/attribute/account/src/lib.rs
+++ b/lang/attribute/account/src/lib.rs
@@ -59,10 +59,10 @@ pub fn account(
 ) -> proc_macro::TokenStream {
     let mut namespace = "".to_string();
     let mut is_zero_copy = false;
-    if args.to_string().split(",").collect::<Vec<_>>().len() > 2 {
+    if args.to_string().split(',').count() > 2 {
         panic!("Only two args are allowed to the account attribute.")
     }
-    for arg in args.to_string().split(",") {
+    for arg in args.to_string().split(',') {
         let ns = arg
             .to_string()
             .replace("\"", "")
@@ -264,14 +264,7 @@ pub fn derive_zero_copy_accessor(item: proc_macro::TokenStream) -> proc_macro::T
             field
                 .attrs
                 .iter()
-                .filter(|attr| {
-                    let name = anchor_syn::parser::tts_to_string(&attr.path);
-                    if name != "accessor" {
-                        return false;
-                    }
-                    return true;
-                })
-                .next()
+                .find(|attr| anchor_syn::parser::tts_to_string(&attr.path) == "accessor")
                 .map(|attr| {
                     let mut tts = attr.tokens.clone().into_iter();
                     let g_stream = match tts.next().expect("Must have a token group") {
diff --git a/lang/attribute/state/src/lib.rs b/lang/attribute/state/src/lib.rs
index 4b46671c..825466e9 100644
--- a/lang/attribute/state/src/lib.rs
+++ b/lang/attribute/state/src/lib.rs
@@ -46,24 +46,22 @@ pub fn state(
                     }
                 }
             }
-        } else {
-            if is_zero_copy {
-                quote! {
-                    impl anchor_lang::__private::AccountSize for #struct_ident {
-                        fn size(&self) -> std::result::Result<u64, anchor_lang::solana_program::program_error::ProgramError> {
-                            let len = anchor_lang::__private::bytemuck::bytes_of(self).len() as u64;
-                            Ok(8 + len)
-                        }
+        } else if is_zero_copy {
+            quote! {
+                impl anchor_lang::__private::AccountSize for #struct_ident {
+                    fn size(&self) -> std::result::Result<u64, anchor_lang::solana_program::program_error::ProgramError> {
+                        let len = anchor_lang::__private::bytemuck::bytes_of(self).len() as u64;
+                        Ok(8 + len)
                     }
                 }
-            } else {
-                let size = proc_macro2::TokenStream::from(args.clone());
-                // Size override given to the macro. Use it.
-                quote! {
-                    impl anchor_lang::__private::AccountSize for #struct_ident {
-                        fn size(&self) -> std::result::Result<u64, anchor_lang::solana_program::program_error::ProgramError> {
-                            Ok(#size)
-                        }
+            }
+        } else {
+            let size = proc_macro2::TokenStream::from(args);
+            // Size override given to the macro. Use it.
+            quote! {
+                impl anchor_lang::__private::AccountSize for #struct_ident {
+                    fn size(&self) -> std::result::Result<u64, anchor_lang::solana_program::program_error::ProgramError> {
+                        Ok(#size)
                     }
                 }
             }
diff --git a/lang/src/context.rs b/lang/src/context.rs
index c570cd4a..a7bd4d58 100644
--- a/lang/src/context.rs
+++ b/lang/src/context.rs
@@ -21,8 +21,8 @@ impl<'a, 'b, 'c, 'info, T: Accounts<'info>> Context<'a, 'b, 'c, 'info, T> {
         remaining_accounts: &'c [AccountInfo<'info>],
     ) -> Self {
         Self {
-            accounts,
             program_id,
+            accounts,
             remaining_accounts,
         }
     }
diff --git a/lang/src/state.rs b/lang/src/state.rs
index 4f2d78fe..4acc81b4 100644
--- a/lang/src/state.rs
+++ b/lang/src/state.rs
@@ -10,7 +10,7 @@ use solana_program::program_error::ProgramError;
 use solana_program::pubkey::Pubkey;
 use std::ops::{Deref, DerefMut};
 
-pub const PROGRAM_STATE_SEED: &'static str = "unversioned";
+pub const PROGRAM_STATE_SEED: &str = "unversioned";
 
 /// Boxed container for the program state singleton.
 #[derive(Clone)]
diff --git a/lang/src/sysvar.rs b/lang/src/sysvar.rs
index 679f7198..2f1b36c2 100644
--- a/lang/src/sysvar.rs
+++ b/lang/src/sysvar.rs
@@ -19,7 +19,7 @@ impl<'info, T: solana_program::sysvar::Sysvar> Sysvar<'info, T> {
     ) -> Result<Sysvar<'info, T>, ProgramError> {
         Ok(Sysvar {
             info: acc_info.clone(),
-            account: T::from_account_info(&acc_info)?,
+            account: T::from_account_info(acc_info)?,
         })
     }
 }
diff --git a/lang/syn/src/codegen/accounts/constraints.rs b/lang/syn/src/codegen/accounts/constraints.rs
index 6bc24e38..006b8ca2 100644
--- a/lang/syn/src/codegen/accounts/constraints.rs
+++ b/lang/syn/src/codegen/accounts/constraints.rs
@@ -73,19 +73,9 @@ pub fn linearize(c_group: &ConstraintGroup) -> Vec<Constraint> {
     if let Some(c) = signer {
         constraints.push(Constraint::Signer(c));
     }
-    constraints.append(
-        &mut belongs_to
-            .into_iter()
-            .map(|c| Constraint::BelongsTo(c))
-            .collect(),
-    );
-    constraints.append(
-        &mut literal
-            .into_iter()
-            .map(|c| Constraint::Literal(c))
-            .collect(),
-    );
-    constraints.append(&mut raw.into_iter().map(|c| Constraint::Raw(c)).collect());
+    constraints.append(&mut belongs_to.into_iter().map(Constraint::BelongsTo).collect());
+    constraints.append(&mut literal.into_iter().map(Constraint::Literal).collect());
+    constraints.append(&mut raw.into_iter().map(Constraint::Raw).collect());
     if let Some(c) = owner {
         constraints.push(Constraint::Owner(c));
     }
@@ -405,7 +395,7 @@ pub fn generate_pda(
     kind: &PdaKind,
 ) -> proc_macro2::TokenStream {
     let field = &f.ident;
-    let (account_ty, account_wrapper_ty, is_zero_copy) = parse_ty(&f);
+    let (account_ty, account_wrapper_ty, is_zero_copy) = parse_ty(f);
 
     let space = match space {
         // If no explicit space param was given, serialize the type to bytes
@@ -647,7 +637,7 @@ pub fn generate_constraint_state(f: &Field, c: &ConstraintState) -> proc_macro2:
 
 // Returns the inner part of the seeds slice as a token stream.
 fn to_seeds_tts(seeds: &[syn::Expr]) -> proc_macro2::TokenStream {
-    assert!(seeds.len() > 0);
+    assert!(!seeds.is_empty());
     let seed_0 = &seeds[0];
     let mut tts = match seed_0 {
         syn::Expr::Path(_) => quote! {
diff --git a/lang/syn/src/codegen/accounts/try_accounts.rs b/lang/syn/src/codegen/accounts/try_accounts.rs
index 00335e07..31f311eb 100644
--- a/lang/syn/src/codegen/accounts/try_accounts.rs
+++ b/lang/syn/src/codegen/accounts/try_accounts.rs
@@ -35,7 +35,7 @@ pub fn generate(accs: &AccountsStruct) -> proc_macro2::TokenStream {
                             *accounts = &accounts[1..];
                         }
                     } else {
-                        let name = typed_ident(&f);
+                        let name = typed_ident(f);
                         match f.constraints.is_init() {
                             false => quote! {
                                 #[cfg(feature = "anchor-debug")]
diff --git a/lang/syn/src/codegen/program/cpi.rs b/lang/syn/src/codegen/program/cpi.rs
index bf8a3a6a..b045710e 100644
--- a/lang/syn/src/codegen/program/cpi.rs
+++ b/lang/syn/src/codegen/program/cpi.rs
@@ -52,9 +52,9 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
                         })
                         .collect()
                 })
-                .unwrap_or(vec![])
+                .unwrap_or_else(Vec::new)
         })
-        .unwrap_or(vec![]);
+        .unwrap_or_else(Vec::new);
     // Generate cpi methods for global methods.
     let global_cpi_methods: Vec<proc_macro2::TokenStream> = program
         .ixs
@@ -66,7 +66,7 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
                 let method_name = &ix.ident;
                 let args: Vec<&syn::PatType> = ix.args.iter().map(|arg| &arg.raw_arg).collect();
                 let name = &ix.raw_method.sig.ident.to_string();
-                let sighash_arr = sighash(SIGHASH_GLOBAL_NAMESPACE, &name);
+                let sighash_arr = sighash(SIGHASH_GLOBAL_NAMESPACE, name);
                 let sighash_tts: proc_macro2::TokenStream =
                     format!("{:?}", sighash_arr).parse().unwrap();
                 quote! {
diff --git a/lang/syn/src/codegen/program/dispatch.rs b/lang/syn/src/codegen/program/dispatch.rs
index f0f12c0c..1416c18a 100644
--- a/lang/syn/src/codegen/program/dispatch.rs
+++ b/lang/syn/src/codegen/program/dispatch.rs
@@ -38,7 +38,7 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
                         let name = &ix.raw_method.sig.ident.to_string();
                         let ix_method_name: proc_macro2::TokenStream =
                             { format!("__{}", name).parse().unwrap() };
-                        let sighash_arr = sighash(SIGHASH_STATE_NAMESPACE, &name);
+                        let sighash_arr = sighash(SIGHASH_STATE_NAMESPACE, name);
                         let sighash_tts: proc_macro2::TokenStream =
                             format!("{:?}", sighash_arr).parse().unwrap();
                         quote! {
diff --git a/lang/syn/src/codegen/program/instruction.rs b/lang/syn/src/codegen/program/instruction.rs
index 02068d93..9191d05d 100644
--- a/lang/syn/src/codegen/program/instruction.rs
+++ b/lang/syn/src/codegen/program/instruction.rs
@@ -134,7 +134,7 @@ pub fn generate(program: &Program) -> proc_macro2::TokenStream {
                 })
                 .collect();
             let ix_data_trait = {
-                let sighash_arr = sighash(SIGHASH_GLOBAL_NAMESPACE, &name);
+                let sighash_arr = sighash(SIGHASH_GLOBAL_NAMESPACE, name);
                 let sighash_tts: proc_macro2::TokenStream =
                     format!("{:?}", sighash_arr).parse().unwrap();
                 quote! {
diff --git a/lang/syn/src/idl/file.rs b/lang/syn/src/idl/file.rs
index 9630abf2..7eb49351 100644
--- a/lang/syn/src/idl/file.rs
+++ b/lang/syn/src/idl/file.rs
@@ -7,7 +7,6 @@ use quote::ToTokens;
 use std::collections::{HashMap, HashSet};
 use std::fs::File;
 use std::io::Read;
-use std::iter::FromIterator;
 use std::path::Path;
 
 const DERIVE_NAME: &str = "Accounts";
@@ -57,8 +56,8 @@ pub fn parse(filename: impl AsRef<Path>) -> Result<Idl> {
                                 let accounts = idl_accounts(accounts_strct, &accs);
                                 IdlInstruction {
                                     name,
-                                    args,
                                     accounts,
+                                    args,
                                 }
                             })
                             .collect::<Vec<_>>()
@@ -93,11 +92,11 @@ pub fn parse(filename: impl AsRef<Path>) -> Result<Idl> {
                         })
                         .collect();
                     let accounts_strct = accs.get(&anchor_ident.to_string()).unwrap();
-                    let accounts = idl_accounts(&accounts_strct, &accs);
+                    let accounts = idl_accounts(accounts_strct, &accs);
                     IdlInstruction {
                         name,
-                        args,
                         accounts,
+                        args,
                     }
                 };
 
@@ -181,13 +180,13 @@ pub fn parse(filename: impl AsRef<Path>) -> Result<Idl> {
                 .named
                 .iter()
                 .map(|f: &syn::Field| {
-                    let index = match f.attrs.iter().next() {
+                    let index = match f.attrs.get(0) {
                         None => false,
                         Some(i) => parser::tts_to_string(&i.path) == "index",
                     };
                     IdlEventField {
                         name: f.ident.clone().unwrap().to_string().to_mixed_case(),
-                        ty: parser::tts_to_string(&f.ty).to_string().parse().unwrap(),
+                        ty: parser::tts_to_string(&f.ty).parse().unwrap(),
                         index,
                     }
                 })
@@ -206,8 +205,10 @@ pub fn parse(filename: impl AsRef<Path>) -> Result<Idl> {
     let ty_defs = parse_ty_defs(&f)?;
 
     let account_structs = parse_accounts(&f);
-    let account_names: HashSet<String> =
-        HashSet::from_iter(account_structs.iter().map(|a| a.ident.to_string()));
+    let account_names: HashSet<String> = account_structs
+        .iter()
+        .map(|a| a.ident.to_string())
+        .collect::<HashSet<_>>();
 
     let error_name = error.map(|e| e.name).unwrap_or_else(|| "".to_string());
 
@@ -217,7 +218,7 @@ pub fn parse(filename: impl AsRef<Path>) -> Result<Idl> {
         if ty_def.name != error_name {
             if account_names.contains(&ty_def.name) {
                 accounts.push(ty_def);
-            } else if events.iter().position(|e| e.name == ty_def.name).is_none() {
+            } else if !events.iter().any(|e| e.name == ty_def.name) {
                 types.push(ty_def);
             }
         }
diff --git a/lang/syn/src/idl/mod.rs b/lang/syn/src/idl/mod.rs
index 44c0b353..9087dec4 100644
--- a/lang/syn/src/idl/mod.rs
+++ b/lang/syn/src/idl/mod.rs
@@ -153,11 +153,11 @@ impl std::str::FromStr for IdlType {
             "Pubkey" => IdlType::PublicKey,
             _ => match s.to_string().strip_prefix("Option<") {
                 None => match s.to_string().strip_prefix("Vec<") {
-                    None => match s.to_string().strip_prefix("[") {
+                    None => match s.to_string().strip_prefix('[') {
                         None => IdlType::Defined(s.to_string()),
                         Some(inner) => {
                             let inner = &inner[..inner.len() - 1];
-                            let mut parts = inner.split(";");
+                            let mut parts = inner.split(';');
                             let ty = IdlType::from_str(parts.next().unwrap()).unwrap();
                             let len = parts.next().unwrap().parse::<usize>().unwrap();
                             assert!(parts.next().is_none());
@@ -167,7 +167,7 @@ impl std::str::FromStr for IdlType {
                     Some(inner) => {
                         let inner_ty = Self::from_str(
                             inner
-                                .strip_suffix(">")
+                                .strip_suffix('>')
                                 .ok_or_else(|| anyhow::anyhow!("Invalid option"))?,
                         )?;
                         IdlType::Vec(Box::new(inner_ty))
@@ -176,7 +176,7 @@ impl std::str::FromStr for IdlType {
                 Some(inner) => {
                     let inner_ty = Self::from_str(
                         inner
-                            .strip_suffix(">")
+                            .strip_suffix('>')
                             .ok_or_else(|| anyhow::anyhow!("Invalid option"))?,
                     )?;
                     IdlType::Option(Box::new(inner_ty))
diff --git a/lang/syn/src/lib.rs b/lang/syn/src/lib.rs
index 13f80f21..c8204335 100644
--- a/lang/syn/src/lib.rs
+++ b/lang/syn/src/lib.rs
@@ -140,6 +140,7 @@ impl AccountsStruct {
     }
 }
 
+#[allow(clippy::large_enum_variant)]
 #[derive(Debug)]
 pub enum AccountField {
     Field(Field),
@@ -292,6 +293,7 @@ impl ConstraintGroup {
 // A single account constraint *after* merging all tokens into a well formed
 // constraint. Some constraints like "associated" are defined by multiple
 // tokens, so a merging phase is required.
+#[allow(clippy::large_enum_variant)]
 #[derive(Debug)]
 pub enum Constraint {
     Init(ConstraintInit),
@@ -311,6 +313,7 @@ pub enum Constraint {
 }
 
 // Constraint token is a single keyword in a `#[account(<TOKEN>)]` attribute.
+#[allow(clippy::large_enum_variant)]
 #[derive(Debug)]
 pub enum ConstraintToken {
     Init(Context<ConstraintInit>),
@@ -433,6 +436,7 @@ pub struct ConstraintAssociatedSpace {
 }
 
 #[derive(Debug, Clone)]
+#[allow(clippy::large_enum_variant)]
 pub enum PdaKind {
     Program,
     Token { owner: Expr, mint: Expr },
diff --git a/lang/syn/src/parser/accounts/constraints.rs b/lang/syn/src/parser/accounts/constraints.rs
index a3a71165..1cf45c95 100644
--- a/lang/syn/src/parser/accounts/constraints.rs
+++ b/lang/syn/src/parser/accounts/constraints.rs
@@ -76,7 +76,10 @@ pub fn parse_token(stream: ParseStream) -> ParseResult<ConstraintToken> {
         }
         _ => {
             stream.parse::<Token![=]>()?;
-            let span = ident.span().join(stream.span()).unwrap_or(ident.span());
+            let span = ident
+                .span()
+                .join(stream.span())
+                .unwrap_or_else(|| ident.span());
             match kw.as_str() {
                 "belongs_to" | "has_one" => ConstraintToken::BelongsTo(Context::new(
                     span,
@@ -173,7 +176,7 @@ pub fn parse_token(stream: ParseStream) -> ParseResult<ConstraintToken> {
                         auth: stream.parse()?,
                     },
                 )),
-                _ => Err(ParseError::new(ident.span(), "Invalid attribute"))?,
+                _ => return Err(ParseError::new(ident.span(), "Invalid attribute")),
             }
         }
     };
diff --git a/lang/syn/src/parser/accounts/mod.rs b/lang/syn/src/parser/accounts/mod.rs
index 9892223c..89191a4b 100644
--- a/lang/syn/src/parser/accounts/mod.rs
+++ b/lang/syn/src/parser/accounts/mod.rs
@@ -14,12 +14,11 @@ pub fn parse(strct: &syn::ItemStruct) -> ParseResult<AccountsStruct> {
     let instruction_api: Option<Punctuated<Expr, Comma>> = strct
         .attrs
         .iter()
-        .filter(|a| {
+        .find(|a| {
             a.path
                 .get_ident()
                 .map_or(false, |ident| ident == "instruction")
         })
-        .next()
         .map(|ix_attr| ix_attr.parse_args_with(Punctuated::<Expr, Comma>::parse_terminated))
         .transpose()?;
     let fields = match &strct.fields {
@@ -68,11 +67,16 @@ pub fn parse_account_field(f: &syn::Field, has_instruction_api: bool) -> ParseRe
 }
 
 fn is_field_primitive(f: &syn::Field) -> ParseResult<bool> {
-    let r = match ident_string(f)?.as_str() {
-        "ProgramState" | "ProgramAccount" | "CpiAccount" | "Sysvar" | "AccountInfo"
-        | "CpiState" | "Loader" => true,
-        _ => false,
-    };
+    let r = matches!(
+        ident_string(f)?.as_str(),
+        "ProgramState"
+            | "ProgramAccount"
+            | "CpiAccount"
+            | "Sysvar"
+            | "AccountInfo"
+            | "CpiState"
+            | "Loader"
+    );
     Ok(r)
 }
 
@@ -113,12 +117,12 @@ fn ident_string(f: &syn::Field) -> ParseResult<String> {
 }
 
 fn parse_program_state(path: &syn::Path) -> ParseResult<ProgramStateTy> {
-    let account_ident = parse_account(&path)?;
+    let account_ident = parse_account(path)?;
     Ok(ProgramStateTy { account_ident })
 }
 
 fn parse_cpi_state(path: &syn::Path) -> ParseResult<CpiStateTy> {
-    let account_ident = parse_account(&path)?;
+    let account_ident = parse_account(path)?;
     Ok(CpiStateTy { account_ident })
 }
 
@@ -161,20 +165,16 @@ fn parse_account(path: &syn::Path) -> ParseResult<syn::Ident> {
                     let path_segment = &ty_path.path.segments[0];
                     Ok(path_segment.ident.clone())
                 }
-                _ => {
-                    return Err(ParseError::new(
-                        args.args[1].span(),
-                        "first bracket argument must be a lifetime",
-                    ))
-                }
+                _ => Err(ParseError::new(
+                    args.args[1].span(),
+                    "first bracket argument must be a lifetime",
+                )),
             }
         }
-        _ => {
-            return Err(ParseError::new(
-                segments.arguments.span(),
-                "expected angle brackets with a lifetime and type",
-            ))
-        }
+        _ => Err(ParseError::new(
+            segments.arguments.span(),
+            "expected angle brackets with a lifetime and type",
+        )),
     }
 }
 
diff --git a/lang/syn/src/parser/program/state.rs b/lang/syn/src/parser/program/state.rs
index 34152878..3b81a53f 100644
--- a/lang/syn/src/parser/program/state.rs
+++ b/lang/syn/src/parser/program/state.rs
@@ -68,7 +68,7 @@ pub fn parse(program_mod: &syn::ItemMod) -> ParseResult<Option<State>> {
                 .items
                 .iter()
                 .filter_map(|item: &syn::ImplItem| match item {
-                    syn::ImplItem::Method(m) => match m.sig.ident.to_string() == CTOR_METHOD_NAME {
+                    syn::ImplItem::Method(m) => match m.sig.ident == CTOR_METHOD_NAME {
                         false => None,
                         true => Some(m),
                     },
@@ -143,7 +143,7 @@ pub fn parse(program_mod: &syn::ItemMod) -> ParseResult<Option<State>> {
                             }
                         }
                     };
-                    Ok((m.clone(), ctx_accounts_ident(&ctx_arg)?))
+                    Ok((m.clone(), ctx_accounts_ident(ctx_arg)?))
                 })
                 .next();
             r.transpose()
@@ -159,7 +159,7 @@ pub fn parse(program_mod: &syn::ItemMod) -> ParseResult<Option<State>> {
                 .items
                 .iter()
                 .filter_map(|item| match item {
-                    syn::ImplItem::Method(m) => match m.sig.ident.to_string() != CTOR_METHOD_NAME {
+                    syn::ImplItem::Method(m) => match m.sig.ident != CTOR_METHOD_NAME {
                         false => None,
                         true => Some(m),
                     },
@@ -238,12 +238,10 @@ pub fn parse(program_mod: &syn::ItemMod) -> ParseResult<Option<State>> {
                         })
                         .map(|m: &syn::ImplItemMethod| {
                             match m.sig.inputs.first() {
-                                None => {
-                                    return Err(ParseError::new(
-                                        m.sig.inputs.span(),
-                                        "state methods must have a self argument",
-                                    ))
-                                }
+                                None => Err(ParseError::new(
+                                    m.sig.inputs.span(),
+                                    "state methods must have a self argument",
+                                )),
                                 Some(_arg) => {
                                     let mut has_receiver = false;
                                     let mut args = m
diff --git a/spl/src/dex.rs b/spl/src/dex.rs
index ade73d86..f35d64b5 100644
--- a/spl/src/dex.rs
+++ b/spl/src/dex.rs
@@ -13,6 +13,7 @@ anchor_lang::solana_program::declare_id!("9xQeWvG816bUx9EPjHmaT23yvVM2ZWbrrpZb9P
 #[cfg(feature = "devnet")]
 anchor_lang::solana_program::declare_id!("DESVgJVGajEgKGXhb6XmqDHGz3VjdgP7rEVESBgxmroY");
 
+#[allow(clippy::too_many_arguments)]
 pub fn new_order_v3<'info>(
     ctx: CpiContext<'_, '_, '_, 'info, NewOrderV3<'info>>,
     side: Side,
@@ -24,7 +25,7 @@ pub fn new_order_v3<'info>(
     client_order_id: u64,
     limit: u16,
 ) -> ProgramResult {
-    let referral = ctx.remaining_accounts.iter().next();
+    let referral = ctx.remaining_accounts.get(0);
     let ix = serum_dex::instruction::new_order(
         ctx.accounts.market.key,
         ctx.accounts.open_orders.key,
@@ -60,7 +61,7 @@ pub fn new_order_v3<'info>(
 pub fn settle_funds<'info>(
     ctx: CpiContext<'_, '_, '_, 'info, SettleFunds<'info>>,
 ) -> ProgramResult {
-    let referral = ctx.remaining_accounts.iter().next();
+    let referral = ctx.remaining_accounts.get(0);
     let ix = serum_dex::instruction::settle_funds(
         &ID,
         ctx.accounts.market.key,
diff --git a/spl/src/token.rs b/spl/src/token.rs
index cec0a24c..5b7e79b3 100644
--- a/spl/src/token.rs
+++ b/spl/src/token.rs
@@ -249,14 +249,14 @@ impl Deref for Mint {
 pub mod accessor {
     use super::*;
 
-    pub fn amount<'info>(account: &AccountInfo<'info>) -> Result<u64, ProgramError> {
+    pub fn amount(account: &AccountInfo) -> Result<u64, ProgramError> {
         let bytes = account.try_borrow_data()?;
         let mut amount_bytes = [0u8; 8];
         amount_bytes.copy_from_slice(&bytes[64..72]);
         Ok(u64::from_le_bytes(amount_bytes))
     }
 
-    pub fn mint<'info>(account: &AccountInfo<'info>) -> Result<Pubkey, ProgramError> {
+    pub fn mint(account: &AccountInfo) -> Result<Pubkey, ProgramError> {
         let bytes = account.try_borrow_data()?;
         let mut mint_bytes = [0u8; 32];
         mint_bytes.copy_from_slice(&bytes[..32]);