diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 1d5071a115c024..b43dda3bf66994 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -45,7 +45,7 @@ jobs:
       - name: Install rust
         uses: hecrj/setup-rust-action@v1
         with:
-          rust-version: "1.39.0"
+          rust-version: "1.40.0"
 
       - name: Install clippy and rustfmt
         if: matrix.kind == 'lint'
diff --git a/cli/compilers/ts.rs b/cli/compilers/ts.rs
index 0e3e0b95dd2889..c6528dd5b44177 100644
--- a/cli/compilers/ts.rs
+++ b/cli/compilers/ts.rs
@@ -60,20 +60,15 @@ impl CompilerConfig {
     // Convert the PathBuf to a canonicalized string.  This is needed by the
     // compiler to properly deal with the configuration.
     let config_path = match &config_file {
-      Some(config_file) => Some(
-        config_file
-          .canonicalize()
-          .map_err(|_| {
-            io::Error::new(
-              io::ErrorKind::InvalidInput,
-              format!(
-                "Could not find the config file: {}",
-                config_file.to_string_lossy()
-              ),
-            )
-          })?
-          .to_owned(),
-      ),
+      Some(config_file) => Some(config_file.canonicalize().map_err(|_| {
+        io::Error::new(
+          io::ErrorKind::InvalidInput,
+          format!(
+            "Could not find the config file: {}",
+            config_file.to_string_lossy()
+          ),
+        )
+      })),
       _ => None,
     };
 
@@ -102,7 +97,7 @@ impl CompilerConfig {
     };
 
     let ts_config = Self {
-      path: config_path,
+      path: config_path.unwrap_or_else(|| Ok(PathBuf::new())).ok(),
       content: config,
       hash: config_hash,
       compile_js,
@@ -261,7 +256,7 @@ impl TsCompiler {
       module_name
     );
 
-    let root_names = vec![module_name.clone()];
+    let root_names = vec![module_name];
     let req_msg = req(
       msg::CompilerRequestType::Bundle,
       root_names,
@@ -269,7 +264,7 @@ impl TsCompiler {
       out_file,
     );
 
-    let worker = TsCompiler::setup_worker(global_state.clone());
+    let worker = TsCompiler::setup_worker(global_state);
     let worker_ = worker.clone();
 
     async move {
@@ -368,7 +363,7 @@ impl TsCompiler {
     let compiling_job = global_state
       .progress
       .add("Compile", &module_url.to_string());
-    let global_state_ = global_state.clone();
+    let global_state_ = global_state;
 
     async move {
       worker.post_message(req_msg).await?;
@@ -390,7 +385,7 @@ impl TsCompiler {
       debug!(">>>>> compile_sync END");
       Ok(compiled_module)
     }
-      .boxed()
+    .boxed()
   }
 
   /// Get associated `CompiledFileMetadata` for given module if it exists.
@@ -483,7 +478,7 @@ impl TsCompiler {
         );
 
         let compiled_file_metadata = CompiledFileMetadata {
-          source_path: source_file.filename.to_owned(),
+          source_path: source_file.filename,
           version_hash,
         };
         let meta_key = self
@@ -618,8 +613,7 @@ mod tests {
     let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
       .parent()
       .unwrap()
-      .join("tests/002_hello.ts")
-      .to_owned();
+      .join("tests/002_hello.ts");
     let specifier =
       ModuleSpecifier::resolve_url_or_path(p.to_str().unwrap()).unwrap();
 
@@ -658,8 +652,7 @@ mod tests {
     let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
       .parent()
       .unwrap()
-      .join("tests/002_hello.ts")
-      .to_owned();
+      .join("tests/002_hello.ts");
     use deno::ModuleSpecifier;
     let module_name = ModuleSpecifier::resolve_url_or_path(p.to_str().unwrap())
       .unwrap()
@@ -717,25 +710,16 @@ mod tests {
 
     let test_cases = vec![
       // valid JSON
-      (
-        r#"{ "compilerOptions": { "checkJs": true } } "#,
-        true,
-      ),
+      (r#"{ "compilerOptions": { "checkJs": true } } "#, true),
       // JSON with comment
       (
         r#"{ "compilerOptions": { // force .js file compilation by Deno "checkJs": true } } "#,
         true,
       ),
       // invalid JSON
-      (
-        r#"{ "compilerOptions": { "checkJs": true },{ } "#,
-        true,
-      ),
+      (r#"{ "compilerOptions": { "checkJs": true },{ } "#, true),
       // without content
-      (
-        "",
-        false,
-      ),
+      ("", false),
     ];
 
     let path = temp_dir_path.join("tsconfig.json");
@@ -754,7 +738,7 @@ mod tests {
     let temp_dir_path = temp_dir.path();
     let path = temp_dir_path.join("doesnotexist.json");
     let path_str = path.to_str().unwrap().to_string();
-    let res = CompilerConfig::load(Some(path_str.clone()));
+    let res = CompilerConfig::load(Some(path_str));
     assert!(res.is_err());
   }
 }
diff --git a/cli/compilers/wasm.rs b/cli/compilers/wasm.rs
index 22ec6526c9444d..f2c0403fab7100 100644
--- a/cli/compilers/wasm.rs
+++ b/cli/compilers/wasm.rs
@@ -76,13 +76,13 @@ impl WasmCompiler {
     let cache = self.cache.clone();
     let maybe_cached = { cache.lock().unwrap().get(&source_file.url).cloned() };
     if let Some(m) = maybe_cached {
-      return futures::future::ok(m.clone()).boxed();
+      return futures::future::ok(m).boxed();
     }
     let cache_ = self.cache.clone();
 
     debug!(">>>>> wasm_compile_async START");
     let base64_data = base64::encode(&source_file.source_code);
-    let worker = WasmCompiler::setup_worker(global_state.clone());
+    let worker = WasmCompiler::setup_worker(global_state);
     let worker_ = worker.clone();
     let url = source_file.url.clone();
 
diff --git a/cli/file_fetcher.rs b/cli/file_fetcher.rs
index 1e147ab3233897..0d89ab26021407 100644
--- a/cli/file_fetcher.rs
+++ b/cli/file_fetcher.rs
@@ -819,10 +819,7 @@ mod tests {
     let headers = fetcher.get_source_code_headers(&url);
 
     assert_eq!(headers.mime_type.clone().unwrap(), "text/javascript");
-    assert_eq!(
-      headers.redirect_to.clone().unwrap(),
-      "http://example.com/a.js"
-    );
+    assert_eq!(headers.redirect_to.unwrap(), "http://example.com/a.js");
 
     let _ = fetcher.save_source_code_headers(
       &url,
@@ -831,10 +828,7 @@ mod tests {
     );
     let headers2 = fetcher.get_source_code_headers(&url);
     assert_eq!(headers2.mime_type.clone().unwrap(), "text/typescript");
-    assert_eq!(
-      headers2.redirect_to.clone().unwrap(),
-      "http://deno.land/a.js"
-    );
+    assert_eq!(headers2.redirect_to.unwrap(), "http://deno.land/a.js");
   }
 
   #[test]
@@ -868,7 +862,7 @@ mod tests {
     );
     let headers_file_name_1 = headers_file_name.clone();
     let headers_file_name_2 = headers_file_name.clone();
-    let headers_file_name_3 = headers_file_name.clone();
+    let headers_file_name_3 = headers_file_name;
 
     let fut = fetcher
       .get_source_file_async(&module_url, true, false, false)
@@ -1128,7 +1122,7 @@ mod tests {
         assert!(redirect_target_headers.redirect_to.is_none());
 
         // Examine the meta result.
-        assert_eq!(mod_meta.url.clone(), target_module_url);
+        assert_eq!(mod_meta.url, target_module_url);
         futures::future::ok(())
       });
 
@@ -1195,7 +1189,7 @@ mod tests {
         assert!(redirect_target_headers.redirect_to.is_none());
 
         // Examine the meta result.
-        assert_eq!(mod_meta.url.clone(), target_url);
+        assert_eq!(mod_meta.url, target_url);
         futures::future::ok(())
       });
 
@@ -1507,9 +1501,8 @@ mod tests {
       },
     ));
 
-    let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-      .join("js/main.ts")
-      .to_owned();
+    let p =
+      std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("js/main.ts");
     let specifier =
       ModuleSpecifier::resolve_url_or_path(p.to_str().unwrap()).unwrap();
     tokio_util::run(fetcher.fetch_source_file_async(&specifier, None).then(
@@ -1535,9 +1528,8 @@ mod tests {
       },
     ));
 
-    let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
-      .join("js/main.ts")
-      .to_owned();
+    let p =
+      std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR")).join("js/main.ts");
     let specifier =
       ModuleSpecifier::resolve_url_or_path(p.to_str().unwrap()).unwrap();
     tokio_util::run(fetcher.fetch_source_file_async(&specifier, None).then(
diff --git a/cli/fmt_errors.rs b/cli/fmt_errors.rs
index 84fcf5b430baaf..8b28d7bb4d7e87 100644
--- a/cli/fmt_errors.rs
+++ b/cli/fmt_errors.rs
@@ -66,7 +66,7 @@ pub fn format_maybe_source_line(
   assert!(end_column.is_some());
   let line = (1 + line_number.unwrap()).to_string();
   let line_color = colors::black_on_white(line.to_string());
-  let line_len = line.clone().len();
+  let line_len = line.len();
   let line_padding =
     colors::black_on_white(format!("{:indent$}", "", indent = line_len))
       .to_string();
diff --git a/cli/import_map.rs b/cli/import_map.rs
index d2916c19814d2f..26f1dd86a14d77 100644
--- a/cli/import_map.rs
+++ b/cli/import_map.rs
@@ -255,14 +255,10 @@ impl ImportMap {
     }
 
     // Sort in longest and alphabetical order.
-    normalized_map.sort_by(|k1, _v1, k2, _v2| {
-      if k1.len() > k2.len() {
-        return Ordering::Less;
-      } else if k2.len() > k1.len() {
-        return Ordering::Greater;
-      }
-
-      k2.cmp(k1)
+    normalized_map.sort_by(|k1, _v1, k2, _v2| match k1.cmp(&k2) {
+      Ordering::Greater => Ordering::Less,
+      Ordering::Less => Ordering::Greater,
+      Ordering::Equal => k2.cmp(k1),
     });
 
     normalized_map
@@ -313,14 +309,10 @@ impl ImportMap {
     }
 
     // Sort in longest and alphabetical order.
-    normalized_map.sort_by(|k1, _v1, k2, _v2| {
-      if k1.len() > k2.len() {
-        return Ordering::Less;
-      } else if k2.len() > k1.len() {
-        return Ordering::Greater;
-      }
-
-      k2.cmp(k1)
+    normalized_map.sort_by(|k1, _v1, k2, _v2| match k1.cmp(&k2) {
+      Ordering::Greater => Ordering::Less,
+      Ordering::Less => Ordering::Greater,
+      Ordering::Equal => k2.cmp(k1),
     });
 
     Ok(normalized_map)
diff --git a/cli/ops/errors.rs b/cli/ops/errors.rs
index 3d94c05c48a8fc..4ef9129162e910 100644
--- a/cli/ops/errors.rs
+++ b/cli/ops/errors.rs
@@ -61,7 +61,7 @@ fn op_apply_source_map(
   );
 
   Ok(JsonOp::Sync(json!({
-    "filename": orig_filename.to_string(),
+    "filename": orig_filename,
     "line": orig_line as u32,
     "column": orig_column as u32,
   })))
diff --git a/cli/ops/plugins.rs b/cli/ops/plugins.rs
index 258cd27646883d..eb52b07171be20 100644
--- a/cli/ops/plugins.rs
+++ b/cli/ops/plugins.rs
@@ -9,7 +9,7 @@ use std::ffi::OsStr;
 use std::sync::Arc;
 
 pub fn init(i: &mut Isolate, s: &ThreadSafeState, r: Arc<deno::OpRegistry>) {
-  let r_ = r.clone();
+  let r_ = r;
   i.register_op(
     "open_plugin",
     s.core_op(json_op(s.stateful_op(move |state, args, zero_copy| {
diff --git a/cli/ops/workers.rs b/cli/ops/workers.rs
index 2b4d11e75ede4c..467d0bfb2ed4ff 100644
--- a/cli/ops/workers.rs
+++ b/cli/ops/workers.rs
@@ -81,7 +81,7 @@ fn op_worker_get_message(
     debug!("op_worker_get_message");
 
     futures::future::ok(json!({
-      "data": maybe_buf.map(|buf| buf.to_owned())
+      "data": maybe_buf.map(|buf| buf)
     }))
   });
 
@@ -261,7 +261,7 @@ fn op_host_get_message(
     .map_err(move |_| -> ErrBox { unimplemented!() })
     .and_then(move |maybe_buf| {
       futures::future::ok(json!({
-        "data": maybe_buf.map(|buf| buf.to_owned())
+        "data": maybe_buf.map(|buf| buf)
       }))
     });
 
diff --git a/cli/permissions.rs b/cli/permissions.rs
index 72a1a928acc09d..8d476c234decbc 100644
--- a/cli/permissions.rs
+++ b/cli/permissions.rs
@@ -394,7 +394,7 @@ mod tests {
 
     let perms = DenoPermissions::from_flags(&DenoFlags {
       read_whitelist: whitelist.clone(),
-      write_whitelist: whitelist.clone(),
+      write_whitelist: whitelist,
       ..Default::default()
     });
 
@@ -555,7 +555,7 @@ mod tests {
     );
 
     let mut perms2 = DenoPermissions::from_flags(&DenoFlags {
-      read_whitelist: whitelist.clone(),
+      read_whitelist: whitelist,
       ..Default::default()
     });
     set_prompt_result(false);
@@ -591,7 +591,7 @@ mod tests {
     );
 
     let mut perms2 = DenoPermissions::from_flags(&DenoFlags {
-      write_whitelist: whitelist.clone(),
+      write_whitelist: whitelist,
       ..Default::default()
     });
     set_prompt_result(false);
@@ -644,7 +644,7 @@ mod tests {
     );
 
     let mut perms3 = DenoPermissions::from_flags(&DenoFlags {
-      net_whitelist: whitelist.clone(),
+      net_whitelist: whitelist,
       ..Default::default()
     });
     set_prompt_result(true);
diff --git a/cli/source_maps.rs b/cli/source_maps.rs
index 95df48a313b496..aea9f087cae618 100644
--- a/cli/source_maps.rs
+++ b/cli/source_maps.rs
@@ -260,8 +260,12 @@ mod tests {
   impl SourceMapGetter for MockSourceMapGetter {
     fn get_source_map(&self, script_name: &str) -> Option<Vec<u8>> {
       let s = match script_name {
-        "foo_bar.ts" => r#"{"sources": ["foo_bar.ts"], "mappings":";;;IAIA,OAAO,CAAC,GAAG,CAAC,qBAAqB,EAAE,EAAE,CAAC,OAAO,CAAC,CAAC;IAC/C,OAAO,CAAC,GAAG,CAAC,eAAe,EAAE,IAAI,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC;IACjD,OAAO,CAAC,GAAG,CAAC,WAAW,EAAE,IAAI,CAAC,QAAQ,CAAC,EAAE,CAAC,CAAC;IAE3C,OAAO,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC"}"#,
-        "bar_baz.ts" => r#"{"sources": ["bar_baz.ts"], "mappings":";;;IAEA,CAAC,KAAK,IAAI,EAAE;QACV,MAAM,GAAG,GAAG,sDAAa,OAAO,2BAAC,CAAC;QAClC,OAAO,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC;IACnB,CAAC,CAAC,EAAE,CAAC;IAEQ,QAAA,GAAG,GAAG,KAAK,CAAC;IAEzB,OAAO,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC"}"#,
+        "foo_bar.ts" => {
+          r#"{"sources": ["foo_bar.ts"], "mappings":";;;IAIA,OAAO,CAAC,GAAG,CAAC,qBAAqB,EAAE,EAAE,CAAC,OAAO,CAAC,CAAC;IAC/C,OAAO,CAAC,GAAG,CAAC,eAAe,EAAE,IAAI,CAAC,QAAQ,CAAC,IAAI,CAAC,CAAC;IACjD,OAAO,CAAC,GAAG,CAAC,WAAW,EAAE,IAAI,CAAC,QAAQ,CAAC,EAAE,CAAC,CAAC;IAE3C,OAAO,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC"}"#
+        }
+        "bar_baz.ts" => {
+          r#"{"sources": ["bar_baz.ts"], "mappings":";;;IAEA,CAAC,KAAK,IAAI,EAAE;QACV,MAAM,GAAG,GAAG,sDAAa,OAAO,2BAAC,CAAC;QAClC,OAAO,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC;IACnB,CAAC,CAAC,EAAE,CAAC;IAEQ,QAAA,GAAG,GAAG,KAAK,CAAC;IAEzB,OAAO,CAAC,GAAG,CAAC,GAAG,CAAC,CAAC"}"#
+        }
         _ => return None,
       };
       Some(s.as_bytes().to_owned())
diff --git a/cli/state.rs b/cli/state.rs
index d31f667b52c744..2657ae747f12a3 100644
--- a/cli/state.rs
+++ b/cli/state.rs
@@ -104,7 +104,7 @@ impl ThreadSafeState {
         Op::Async(fut) => {
           let state = state.clone();
           let result_fut = fut.map_ok(move |buf: Buf| {
-            state.clone().metrics_op_completed(buf.len());
+            state.metrics_op_completed(buf.len());
             buf
           });
           Op::Async(result_fut.boxed())
diff --git a/cli/worker.rs b/cli/worker.rs
index e35458d39e17a1..410d6ee4455803 100644
--- a/cli/worker.rs
+++ b/cli/worker.rs
@@ -243,8 +243,7 @@ mod tests {
     let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
       .parent()
       .unwrap()
-      .join("tests/esm_imports_a.js")
-      .to_owned();
+      .join("tests/esm_imports_a.js");
     let module_specifier =
       ModuleSpecifier::resolve_url_or_path(&p.to_string_lossy()).unwrap();
     let global_state = ThreadSafeGlobalState::new(
@@ -288,8 +287,7 @@ mod tests {
     let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
       .parent()
       .unwrap()
-      .join("tests/circular1.ts")
-      .to_owned();
+      .join("tests/circular1.ts");
     let module_specifier =
       ModuleSpecifier::resolve_url_or_path(&p.to_string_lossy()).unwrap();
     let global_state = ThreadSafeGlobalState::new(
@@ -335,8 +333,7 @@ mod tests {
     let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
       .parent()
       .unwrap()
-      .join("cli/tests/006_url_imports.ts")
-      .to_owned();
+      .join("cli/tests/006_url_imports.ts");
     let module_specifier =
       ModuleSpecifier::resolve_url_or_path(&p.to_string_lossy()).unwrap();
     let mut flags = flags::DenoFlags::default();
@@ -353,7 +350,7 @@ mod tests {
       int,
     )
     .unwrap();
-    let global_state_ = global_state.clone();
+    let global_state_ = global_state;
     let state_ = state.clone();
     tokio_util::run(async move {
       let mut worker = Worker::new(
@@ -501,8 +498,7 @@ mod tests {
       let p = std::path::PathBuf::from(env!("CARGO_MANIFEST_DIR"))
         .parent()
         .unwrap()
-        .join("tests/002_hello.ts")
-        .to_owned();
+        .join("tests/002_hello.ts");
       let module_specifier =
         ModuleSpecifier::resolve_url_or_path(&p.to_string_lossy()).unwrap();
       let result =
diff --git a/core/examples/http_bench.rs b/core/examples/http_bench.rs
index c08c5b6e143d87..a79e3fc20e3d95 100644
--- a/core/examples/http_bench.rs
+++ b/core/examples/http_bench.rs
@@ -117,7 +117,7 @@ fn http_op(
     let record = Record::from(control);
     let is_sync = record.promise_id == 0;
     let op = handler(record.clone(), zero_copy_buf);
-    let mut record_a = record.clone();
+    let mut record_a = record;
 
     let fut = async move {
       match op.await {
diff --git a/core/module_specifier.rs b/core/module_specifier.rs
index ad24616ff38dd1..dd5347a33db3c9 100644
--- a/core/module_specifier.rs
+++ b/core/module_specifier.rs
@@ -402,7 +402,7 @@ mod tests {
       );
       tests.extend(vec![
         (r"/deno/tests/006_url_imports.ts", expected_url.to_string()),
-        (r"\deno\tests\006_url_imports.ts", expected_url.to_string()),
+        (r"\deno\tests\006_url_imports.ts", expected_url),
       ]);
 
       // Relative local path.
@@ -413,8 +413,8 @@ mod tests {
       tests.extend(vec![
         (r"tests/006_url_imports.ts", expected_url.to_string()),
         (r"tests\006_url_imports.ts", expected_url.to_string()),
-        (r"./tests/006_url_imports.ts", expected_url.to_string()),
-        (r".\tests\006_url_imports.ts", expected_url.to_string()),
+        (r"./tests/006_url_imports.ts", (*expected_url).to_string()),
+        (r".\tests\006_url_imports.ts", (*expected_url).to_string()),
       ]);
 
       // UNC network path.
@@ -437,7 +437,7 @@ mod tests {
       let expected_url = format!("file://{}/tests/006_url_imports.ts", cwd_str);
       tests.extend(vec![
         ("tests/006_url_imports.ts", expected_url.to_string()),
-        ("./tests/006_url_imports.ts", expected_url.to_string()),
+        ("./tests/006_url_imports.ts", expected_url),
       ]);
     }
 
diff --git a/core/modules.rs b/core/modules.rs
index 3f431d36d69d56..722fa2cbeaab43 100644
--- a/core/modules.rs
+++ b/core/modules.rs
@@ -186,7 +186,7 @@ impl<L: Loader + Unpin> RecursiveLoad<L> {
     {
       let fut = self
         .loader
-        .load(&module_specifier, Some(referrer_specifier.clone()));
+        .load(&module_specifier, Some(referrer_specifier));
       self.pending.push(fut.boxed());
       self.is_pending.insert(module_specifier);
     }
@@ -879,7 +879,7 @@ mod tests {
       let loads = loader.loads.clone();
       let recursive_load =
         RecursiveLoad::main("/circular1.js", None, loader, modules);
-      let mut load_fut = recursive_load.get_future(isolate.clone()).boxed();
+      let mut load_fut = recursive_load.get_future(isolate).boxed();
       let result = Pin::new(&mut load_fut).poll(&mut cx);
       assert!(result.is_ready());
       if let Poll::Ready(Ok(circular1_id)) = result {
@@ -951,7 +951,7 @@ mod tests {
       let loads = loader.loads.clone();
       let recursive_load =
         RecursiveLoad::main("/redirect1.js", None, loader, modules);
-      let mut load_fut = recursive_load.get_future(isolate.clone()).boxed();
+      let mut load_fut = recursive_load.get_future(isolate).boxed();
       let result = Pin::new(&mut load_fut).poll(&mut cx);
       println!(">> result {:?}", result);
       assert!(result.is_ready());
diff --git a/deno_typescript/lib.rs b/deno_typescript/lib.rs
index c410c870fb63b4..3d27149c527846 100644
--- a/deno_typescript/lib.rs
+++ b/deno_typescript/lib.rs
@@ -115,7 +115,7 @@ impl TSIsolate {
     let source =
       &format!("main({:?}, {})", config_json.to_string(), root_names_json);
     self.isolate.execute("<anon>", source)?;
-    Ok(self.state.clone())
+    Ok(self.state)
   }
 }