Function eval

crates/vm/src/stdlib/builtins.rs:537–569

(
        source: Either<ArgStrOrBytesLike, PyRef<crate::builtins::PyCode>>,
        scope: ScopeArgs,
        vm: &VirtualMachine,
    )

    #[pyfunction]
    fn eval(
        source: Either<ArgStrOrBytesLike, PyRef<crate::builtins::PyCode>>,
        scope: ScopeArgs,
        vm: &VirtualMachine,
    ) -> PyResult {
        let scope = scope.make_scope(vm, "eval")?;

        // source as string
        let code = match source {
            Either::A(either) => {
                let source: &[u8] = &either.borrow_bytes();
                if source.contains(&0) {
                    return Err(vm.new_exception_msg(
                        vm.ctx.exceptions.syntax_error.to_owned(),
                        "source code string cannot contain null bytes".into(),
                    ));
                }

                let source = core::str::from_utf8(source).map_err(|err| {
                    let msg = format!(
                        "(unicode error) 'utf-8' codec can't decode byte 0x{:x?} in position {}: invalid start byte",
                        source[err.valid_up_to()],
                        err.valid_up_to()
                    );

                    vm.new_exception_msg(vm.ctx.exceptions.syntax_error.to_owned(), msg.into())
                })?;
                Ok(Either::A(vm.ctx.new_utf8_str(source.trim_start())))
            }
            Either::B(code) => Ok(Either::B(code)),
        }?;
        run_code(vm, code, scope, crate::compiler::Mode::Eval, "eval")
    }

    #[pyfunction]
    fn exec(