fix lint warnings

src/machine/system_calls.rs

@@ -4685,7 +4685,7 @@ impl Machine {
 
             let http_listener = HttpListener {
                 incoming: rx,
-                warp_shutdown: warp_shutdown,
+                warp_shutdown,
             };
             let http_listener: TypedArenaPtr<HttpListener> =
                 arena_alloc!(http_listener, &mut self.machine_st.arena);
@@ -4750,7 +4750,7 @@ impl Machine {
             Err(_) => unreachable!(),
         }
 
-        return false;
+        false
     }
 
     #[cfg(feature = "http")]

tests/scryer/helper.rs

@@ -32,8 +32,6 @@ impl Expectable for &[u8] {
 /// Tests whether the file can be successfully loaded
 /// and produces the expected output during it
 pub(crate) fn load_module_test<T: Expectable>(file: &str, expected: T) {
-    use scryer_prolog::MachineBuilder;
-
     let mut wam = MachineBuilder::default().build();
     expected.assert_eq(wam.test_load_file(file).as_slice());
 }
@@ -43,8 +41,6 @@ pub(crate) fn load_module_test_with_input<T: Expectable>(
     input: impl Into<Cow<'static, str>>,
     expected: T,
 ) {
-    use scryer_prolog::MachineBuilder;
-
     let mut wam = MachineBuilder::default()
         .with_streams(StreamConfig::in_memory().with_user_input(InputStreamConfig::string(input)))
         .build();