Fix some clippy lints that were 'allow'ed

compiler/src/symboltable.rs

@@ -741,7 +741,6 @@ impl SymbolTableBuilder {
         Ok(())
     }
 
-    #[allow(clippy::single_match)]
     fn register_name(&mut self, name: &str, role: SymbolUsage) -> SymbolTableResult {
         let scope_depth = self.tables.len();
         let table = self.tables.last_mut().unwrap();
@@ -777,13 +776,11 @@ impl SymbolTableBuilder {
 
         // Some more checks:
         match role {
-            SymbolUsage::Nonlocal => {
-                if scope_depth < 2 {
-                    return Err(SymbolTableError {
-                        error: format!("cannot define nonlocal '{}' at top level.", name),
-                        location,
-                    });
-                }
+            SymbolUsage::Nonlocal if scope_depth < 2 => {
+                return Err(SymbolTableError {
+                    error: format!("cannot define nonlocal '{}' at top level.", name),
+                    location,
+                })
             }
             _ => {
                 // Ok!

parser/src/function.rs

@@ -6,7 +6,6 @@ use crate::error::{LexicalError, LexicalErrorType};
 type ParameterDefs = (Vec<ast::Parameter>, Vec<ast::Expression>);
 type ParameterDef = (ast::Parameter, Option<ast::Expression>);
 
-#[allow(clippy::collapsible_if)]
 pub fn parse_params(
     params: (Vec<ParameterDef>, Vec<ParameterDef>),
 ) -> Result<ParameterDefs, LexicalError> {
@@ -16,15 +15,13 @@ pub fn parse_params(
     let mut try_default = |name: &ast::Parameter, default| {
         if let Some(default) = default {
             defaults.push(default);
-        } else {
-            if !defaults.is_empty() {
-                // Once we have started with defaults, all remaining arguments must
-                // have defaults
-                return Err(LexicalError {
-                    error: LexicalErrorType::DefaultArgumentError,
-                    location: name.location,
-                });
-            }
+        } else if !defaults.is_empty() {
+            // Once we have started with defaults, all remaining arguments must
+            // have defaults
+            return Err(LexicalError {
+                error: LexicalErrorType::DefaultArgumentError,
+                location: name.location,
+            });
         }
         Ok(())
     };

vm/src/lib.rs

@@ -6,11 +6,7 @@
 //! - Base objects
 
 // for methods like vm.to_str(), not the typical use of 'to' as a method prefix
-#![allow(
-    clippy::wrong_self_convention,
-    clippy::let_and_return,
-    clippy::implicit_hasher
-)]
+#![allow(clippy::wrong_self_convention, clippy::implicit_hasher)]
 #![doc(html_logo_url = "https://raw.githubusercontent.com/RustPython/RustPython/master/logo.png")]
 #![doc(html_root_url = "https://docs.rs/rustpython-vm/")]
 

vm/src/obj/objcode.rs

@@ -45,8 +45,7 @@ impl PyValue for PyCode {
 #[pyimpl]
 impl PyCodeRef {
     #[pyslot]
-    #[allow(clippy::new_ret_no_self)]
-    fn new(_cls: PyClassRef, vm: &VirtualMachine) -> PyResult {
+    fn new(_cls: PyClassRef, vm: &VirtualMachine) -> PyResult<PyRef<Self>> {
         Err(vm.new_type_error("Cannot directly create code object".to_owned()))
     }
 

vm/src/obj/objint.rs

@@ -118,7 +118,6 @@ impl_try_from_object_int!(
     (u64, to_u64),
 );
 
-#[allow(clippy::collapsible_if)]
 fn inner_pow(int1: &BigInt, int2: &BigInt, vm: &VirtualMachine) -> PyResult {
     if int2.is_negative() {
         let v1 = try_float(int1, vm)?;

vm/src/obj/objproperty.rs

@@ -73,7 +73,6 @@ struct PropertyArgs {
 }
 
 impl SlotDescriptor for PyProperty {
-    #[allow(clippy::collapsible_if)]
     fn descr_get(
         vm: &VirtualMachine,
         zelf: PyObjectRef,
@@ -83,12 +82,10 @@ impl SlotDescriptor for PyProperty {
         let (zelf, obj) = Self::_unwrap(zelf, obj, vm)?;
         if vm.is_none(&obj) {
             Ok(zelf.into_object())
+        } else if let Some(getter) = zelf.getter.as_ref() {
+            vm.invoke(&getter, obj)
         } else {
-            if let Some(getter) = zelf.getter.as_ref() {
-                vm.invoke(&getter, obj)
-            } else {
-                Err(vm.new_attribute_error("unreadable attribute".to_string()))
-            }
+            Err(vm.new_attribute_error("unreadable attribute".to_string()))
         }
     }
 }

vm/src/stdlib/imp.rs

@@ -86,7 +86,7 @@ fn imp_fix_co_filename(_code: PyObjectRef, _path: PyStringRef) {
 
 pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
     let ctx = &vm.ctx;
-    let module = py_module!(vm, "_imp", {
+    py_module!(vm, "_imp", {
         "extension_suffixes" => ctx.new_function(imp_extension_suffixes),
         "acquire_lock" => ctx.new_function(imp_acquire_lock),
         "release_lock" => ctx.new_function(imp_release_lock),
@@ -99,7 +99,5 @@ pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
         "init_frozen" => ctx.new_function(imp_init_frozen),
         "is_frozen_package" => ctx.new_function(imp_is_frozen_package),
         "_fix_co_filename" => ctx.new_function(imp_fix_co_filename),
-    });
-
-    module
+    })
 }

vm/src/stdlib/io.rs

@@ -925,7 +925,7 @@ pub fn io_open(vm: &VirtualMachine, args: PyFuncArgs) -> PyResult {
         _ => unimplemented!("'a' mode is not yet implemented"),
     };
 
-    let io_obj = match typ.chars().next().unwrap() {
+    match typ.chars().next().unwrap() {
         // If the mode is text this buffer type is consumed on construction of
         // a TextIOWrapper which is subsequently returned.
         't' => {
@@ -937,8 +937,7 @@ pub fn io_open(vm: &VirtualMachine, args: PyFuncArgs) -> PyResult {
         // For Buffered class construct "raw" IO class e.g. FileIO and pass this into corresponding field
         'b' => buffered,
         _ => unreachable!(),
-    };
-    io_obj
+    }
 }
 
 pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {

vm/src/stdlib/itertools.rs

@@ -767,6 +767,8 @@ impl PyItertoolsTee {
         .into_object())
     }
 
+    // TODO: make tee() a function, rename this class to itertools._tee and make
+    // teedata a python class
     #[pyslot]
     #[allow(clippy::new_ret_no_self)]
     fn tp_new(

vm/src/stdlib/warnings.rs

@@ -34,9 +34,7 @@ fn warnings_warn(args: WarnArgs, vm: &VirtualMachine) -> PyResult<()> {
 
 pub fn make_module(vm: &VirtualMachine) -> PyObjectRef {
     let ctx = &vm.ctx;
-    let module = py_module!(vm, "_warnings", {
+    py_module!(vm, "_warnings", {
          "warn" => ctx.new_function(warnings_warn),
-    });
-
-    module
+    })
 }

vm/src/version.rs

@@ -102,9 +102,8 @@ fn get_git_timestamp_datetime() -> DateTime<Local> {
     let timestamp = timestamp.parse::<u64>().unwrap_or(0);
 
     let datetime = UNIX_EPOCH + Duration::from_secs(timestamp);
-    let datetime = DateTime::<Local>::from(datetime);
 
-    datetime
+    datetime.into()
 }
 
 pub fn get_git_date() -> String {

vm/src/vm.rs

@@ -768,8 +768,7 @@ impl VirtualMachine {
             self.trace_event(TraceEvent::Return)?;
             result
         } else if class.has_attr("__call__") {
-            let result = self.call_method(&callable, "__call__", args);
-            result
+            self.call_method(&callable, "__call__", args)
         } else {
             Err(self.new_type_error(format!(
                 "'{}' object is not callable",
@@ -783,8 +782,7 @@ impl VirtualMachine {
     where
         T: Into<PyFuncArgs>,
     {
-        let res = self._invoke(func_ref, args.into());
-        res
+        self._invoke(func_ref, args.into())
     }
 
     /// Call registered trace function.