diff --git a/examples/repl/cmdline.rs b/examples/repl/cmdline.rs
index ca9d8de57..181f9ebd0 100644
--- a/examples/repl/cmdline.rs
+++ b/examples/repl/cmdline.rs
@@ -132,10 +132,8 @@ fn poke_spec(context: &Context, spec: *const libc::c_char) -> libc::c_int {
         real_spec = rs.unwrap();
     }
     if let Some(suffix) = dc_get_filesuffix_lc(&real_spec) {
-        if suffix == "eml" {
-            if dc_poke_eml_file(context, &real_spec).is_ok() {
-                read_cnt += 1
-            }
+        if suffix == "eml" && dc_poke_eml_file(context, &real_spec).is_ok() {
+            read_cnt += 1
         }
     } else {
         /* import a directory */
@@ -588,7 +586,7 @@ pub unsafe fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::E
             let members = chat::get_chat_contacts(context, sel_chat.id);
             let subtitle = if sel_chat.is_device_talk() {
                 "device-talk".to_string()
-            } else if sel_chat.get_type() == Chattype::Single && members.len() >= 1 {
+            } else if sel_chat.get_type() == Chattype::Single && !members.is_empty() {
                 let contact = Contact::get_by_id(context, members[0])?;
                 contact.get_addr().to_string()
             } else {
@@ -862,11 +860,7 @@ pub unsafe fn dc_cmdline(context: &Context, line: &str) -> Result<(), failure::E
         "archive" | "unarchive" => {
             ensure!(!arg1.is_empty(), "Argument <chat-id> missing.");
             let chat_id = arg1.parse()?;
-            chat::archive(
-                context,
-                chat_id,
-                if arg0 == "archive" { true } else { false },
-            )?;
+            chat::archive(context, chat_id, arg0 == "archive")?;
         }
         "delchat" => {
             ensure!(!arg1.is_empty(), "Argument <chat-id> missing.");
diff --git a/examples/repl/main.rs b/examples/repl/main.rs
index c1e855cfb..bc7528c5d 100644
--- a/examples/repl/main.rs
+++ b/examples/repl/main.rs
@@ -235,7 +235,7 @@ impl Completer for DcHelper {
     }
 }
 
-const IMEX_COMMANDS: [&'static str; 12] = [
+const IMEX_COMMANDS: [&str; 12] = [
     "initiate-key-transfer",
     "get-setupcodebegin",
     "continue-key-transfer",
@@ -250,7 +250,7 @@ const IMEX_COMMANDS: [&'static str; 12] = [
     "stop",
 ];
 
-const DB_COMMANDS: [&'static str; 11] = [
+const DB_COMMANDS: [&str; 11] = [
     "info",
     "open",
     "close",
@@ -264,7 +264,7 @@ const DB_COMMANDS: [&'static str; 11] = [
     "housekeeping",
 ];
 
-const CHAT_COMMANDS: [&'static str; 24] = [
+const CHAT_COMMANDS: [&str; 24] = [
     "listchats",
     "listarchived",
     "chat",
@@ -290,7 +290,7 @@ const CHAT_COMMANDS: [&'static str; 24] = [
     "unarchive",
     "delchat",
 ];
-const MESSAGE_COMMANDS: [&'static str; 8] = [
+const MESSAGE_COMMANDS: [&str; 8] = [
     "listmsgs",
     "msginfo",
     "listfresh",
@@ -300,7 +300,7 @@ const MESSAGE_COMMANDS: [&'static str; 8] = [
     "unstar",
     "delmsg",
 ];
-const CONTACT_COMMANDS: [&'static str; 6] = [
+const CONTACT_COMMANDS: [&str; 6] = [
     "listcontacts",
     "listverified",
     "addcontact",
@@ -308,7 +308,7 @@ const CONTACT_COMMANDS: [&'static str; 6] = [
     "delcontact",
     "cleanupcontacts",
 ];
-const MISC_COMMANDS: [&'static str; 9] = [
+const MISC_COMMANDS: [&str; 9] = [
     "getqr", "getbadqr", "checkqr", "event", "fileinfo", "clear", "exit", "quit", "help",
 ];
 
@@ -334,8 +334,8 @@ impl Hinter for DcHelper {
     }
 }
 
-static COLORED_PROMPT: &'static str = "\x1b[1;32m> \x1b[0m";
-static PROMPT: &'static str = "> ";
+static COLORED_PROMPT: &str = "\x1b[1;32m> \x1b[0m";
+static PROMPT: &str = "> ";
 
 impl Highlighter for DcHelper {
     fn highlight_prompt<'p>(&self, prompt: &'p str) -> Cow<'p, str> {
diff --git a/examples/simple.rs b/examples/simple.rs
index 9fe8ade26..67c8fbbc7 100644
--- a/examples/simple.rs
+++ b/examples/simple.rs
@@ -113,7 +113,7 @@ fn main() {
 
     println!("stopping threads");
 
-    *running.clone().write().unwrap() = false;
+    *running.write().unwrap() = false;
     deltachat::job::interrupt_inbox_idle(&ctx, true);
     deltachat::job::interrupt_smtp_idle(&ctx);
 
diff --git a/tests/stress.rs b/tests/stress.rs
index af3ff455d..5ce1b8e45 100644
--- a/tests/stress.rs
+++ b/tests/stress.rs
@@ -128,7 +128,7 @@ fn test_encryption_decryption() {
     public_keyring.add_ref(&public_key);
 
     let mut public_keyring2 = Keyring::default();
-    public_keyring2.add_owned(public_key2.clone());
+    public_keyring2.add_owned(public_key2);
 
     let mut valid_signatures: HashSet<String> = Default::default();
 
@@ -220,7 +220,7 @@ fn create_test_context() -> TestContext {
     let dir = tempdir().unwrap();
     let dbfile = dir.path().join("db.sqlite");
     let ctx = Context::new(Box::new(cb), "FakeOs".into(), dbfile).unwrap();
-    TestContext { ctx: ctx, dir: dir }
+    TestContext { ctx, dir }
 }
 
 #[test]