Use IntoIterator for array impl everywhere.

compiler/rustc_session/src/session.rs

@@ -795,12 +795,11 @@ impl Session {
     /// Returns a list of directories where target-specific tool binaries are located.
     pub fn get_tools_search_paths(&self, self_contained: bool) -> Vec<PathBuf> {
         let rustlib_path = rustc_target::target_rustlib_path(&self.sysroot, &config::host_triple());
-        let p = std::array::IntoIter::new([
+        let p = PathBuf::from_iter([
             Path::new(&self.sysroot),
             Path::new(&rustlib_path),
             Path::new("bin"),
-        ])
-        .collect::<PathBuf>();
+        ]);
         if self_contained { vec![p.clone(), p.join("self-contained")] } else { vec![p] }
     }