ci: upgrade to Rust 1.44.0 (denoland#6113)

.github/workflows/ci.yml

@@ -66,7 +66,7 @@ jobs:
       - name: Install rust
         uses: hecrj/setup-rust-action@v1
         with:
-          rust-version: "1.43.0"
+          rust-version: 1.44.0
 
       - name: Install clippy and rustfmt
         if: matrix.config.kind == 'lint'

cli/swc_util.rs

@@ -521,7 +521,7 @@ pub fn analyze_dependencies_and_references(
     let comments = parser
       .comments
       .take_leading_comments(module_span.lo())
-      .unwrap_or_else(|| vec![]);
+      .unwrap_or_else(Vec::new);
 
     let mut references = vec![];
     for comment in comments {

cli/tests/integration_tests.rs

@@ -2787,7 +2787,7 @@ mod util {
   pub const PERMISSION_DENIED_PATTERN: &str = "PermissionDenied";
 
   lazy_static! {
-    static ref DENO_DIR: TempDir = { TempDir::new().expect("tempdir fail") };
+    static ref DENO_DIR: TempDir = TempDir::new().expect("tempdir fail");
 
     // STRIP_ANSI_RE and strip_ansi_codes are lifted from the "console" crate.
     // Copyright 2017 Armin Ronacher <armin.ronacher@active-4.com>. MIT License.

cli/tsc.rs

@@ -833,12 +833,12 @@ impl SourceMapGetter for TsCompiler {
     self
       .try_resolve_and_get_source_file(script_name)
       .and_then(|out| {
-        str::from_utf8(&out.source_code).ok().and_then(|v| {
+        str::from_utf8(&out.source_code).ok().map(|v| {
           // Do NOT use .lines(): it skips the terminating empty line.
           // (due to internally using .split_terminator() instead of .split())
           let lines: Vec<&str> = v.split('\n').collect();
           assert!(lines.len() > line);
-          Some(lines[line].to_string())
+          lines[line].to_string()
         })
       })
   }