avoid to_pystr to generate type name

Author: youknowone

vm/src/format.rs

@@ -910,9 +910,10 @@ fn call_object_format(
 
     let result = vm.call_method(&argument, "__format__", vec![returned_type])?;
     if !objtype::isinstance(&result, &vm.ctx.types.str_type) {
-        let result_type = result.class();
-        let actual_type = vm.to_pystr(&result_type)?;
-        return Err(vm.new_type_error(format!("__format__ must return a str, not {}", actual_type)));
+        return Err(vm.new_type_error(format!(
+            "__format__ must return a str, not {}",
+            &result.class().name
+        )));
     }
     Ok(result)
 }

vm/src/function.rs

@@ -128,8 +128,8 @@ impl PyFuncArgs {
                 if isinstance(&kwarg, &ty) {
                     Ok(Some(kwarg))
                 } else {
-                    let expected_ty_name = vm.to_pystr(&ty)?;
-                    let actual_ty_name = vm.to_pystr(&kwarg.class())?;
+                    let expected_ty_name = &ty.name;
+                    let actual_ty_name = &kwarg.class().name;
                     Err(vm.new_type_error(format!(
                         "argument of type {} is required for named parameter `{}` (got: {})",
                         expected_ty_name, key, actual_ty_name

vm/src/obj/objbool.rs

@@ -155,8 +155,7 @@ impl PyBool {
     #[pyslot]
     fn tp_new(zelf: PyObjectRef, x: OptionalArg<PyObjectRef>, vm: &VirtualMachine) -> PyResult {
         if !objtype::isinstance(&zelf, &vm.ctx.types.type_type) {
-            let zelf_typ = zelf.class();
-            let actual_type = vm.to_pystr(&zelf_typ)?;
+            let actual_type = &zelf.class().name;
             return Err(vm.new_type_error(format!(
                 "requires a 'type' object but received a '{}'",
                 actual_type

vm/src/obj/objobject.rs

@@ -194,7 +194,7 @@ impl PyBaseObject {
                     Ok(())
                 }
                 Err(value) => {
-                    let type_repr = vm.to_pystr(&value.class())?;
+                    let type_repr = &value.class().name;
                     Err(vm.new_type_error(format!(
                         "__class__ must be set to a class, not '{}' object",
                         type_repr