You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: str_or_repr_defined_in_stub.rs
    path of file: ./repos/ruff/crates/ruff_linter/src/rules/flake8_pyi/rules
    
    the code of the file until where you have to start completion: use ruff_python_ast as ast;
use ruff_python_ast::Stmt;

use ruff_diagnostics::{AlwaysFixableViolation, Diagnostic, Fix};
use ruff_macros::{derive_message_formats, violation};
use ruff_python_ast::identifier::Identifier;
use ruff_python_semantic::analyze::visibility::is_abstract;

use crate::checkers::ast::Checker;
use crate::fix::edits::delete_stmt;

/// ## What it does
/// Checks for redundant definitions of `__str__` or `__repr__` in stubs.
///
/// ## Why is this bad?
/// Defining `__str__` or `__repr__` in a stub is almost always redundant,
/// as the signatures are almost always identical to those of the default
/// equivalent, `object.__str__` and `object.__repr__`, respectively.
///
/// ## Example
/// ```python
/// class Foo:
///     def __repr__(self) -> str:
///         ...

    
pub(crate) fn str_or_repr_defined_in_stub(checker: &mut Checker, stmt: &Stmt) {
    let Stmt::FunctionDef(ast::StmtFunctionDef {
        name,
        decorator_list,
        returns,
        parameters,
        ..
    }) = stmt
    else {
        return;
    };

    let Some(returns) = returns else {
        return;
    };

    if !matches!(name.as_str(), "__str__" | "__repr__") {
        return;
    }

    if !checker.semantic().current_scope().kind.is_class() {
        return;
    }

    // It is a violation only if the method signature matches that of `object.__str__`
    // or `object.__repr__` exactly and the method is not decorated as abstract.
    if !parameters.kwonlyargs.is_empty()
        || (parameters.args.len() + parameters.posonlyargs.len()) > 1
    {
        return;
    }

    if is_abstract(decorator_list, checker.semantic()) {
        return;
    }

    if checker
        .semantic()
        .resolve_qualified_name(returns)
        .map_or(true, |qualified_name| {
            !matches!(qualified_name.segments(), ["" | "builtins", "str"])
        })
    {
        return;
    }

    let mut diagnostic = Diagnostic::new(
        StrOrReprDefinedInStub {
            name: name.to_string(),
        },
        stmt.identifier(),
    );
    let stmt = checker.semantic().current_statement();
    let parent = checker.semantic().current_statement_parent();
    let edit = delete_stmt(stmt, parent, checker.locator(), checker.indexer());
    diagnostic.set_fix(Fix::safe_edit(edit).isolate(Checker::isolation(
        checker.semantic().current_statement_parent_id(),
    )));
    checker.diagnostics.push(diagnostic);
}