fix clippy warnings

vm/src/stdlib/builtins.rs

@@ -920,7 +920,7 @@ pub fn make_module(vm: &VirtualMachine, module: PyObjectRef) {
 
     crate::protocol::VecBuffer::make_class(&vm.ctx);
 
-    let _ = builtins::extend_module(vm, &module);
+    builtins::extend_module(vm, &module);
 
     let debug_mode: bool = vm.state.settings.optimize == 0;
     extend_module!(vm, module, {

vm/src/stdlib/io.rs

@@ -1280,7 +1280,7 @@ mod _io {
                 }
             }
             if self.writable() {
-                let _ = self.flush_rewind(vm)?;
+                self.flush_rewind(vm)?;
             }
             self.reset_read();
             self.pos = 0;

vm/src/stdlib/itertools.rs

@@ -316,7 +316,8 @@ mod decl {
         fn repr(&self, vm: &VirtualMachine) -> PyResult<String> {
             let mut fmt = format!("{}", &self.object.repr(vm)?);
             if let Some(ref times) = self.times {
-                fmt.push_str(&format!(", {}", times.read()));
+                fmt.push_str(", ");
+                fmt.push_str(&times.read().to_string());
             }
             Ok(format!("repeat({})", fmt))
         }

vm/src/stdlib/os.rs

@@ -1763,7 +1763,7 @@ pub(crate) struct SupportFunc {
     follow_symlinks: Option<bool>,
 }
 
-impl<'a> SupportFunc {
+impl SupportFunc {
     pub(crate) fn new(
         name: &'static str,
         fd: Option<bool>,

vm/src/stdlib/posix.rs

@@ -516,8 +516,7 @@ pub mod module {
 
     #[pyfunction]
     fn sched_yield(vm: &VirtualMachine) -> PyResult<()> {
-        let _ = nix::sched::sched_yield().map_err(|e| e.to_pyexception(vm))?;
-        Ok(())
+        nix::sched::sched_yield().map_err(|e| e.to_pyexception(vm))
     }
 
     #[pyattr]