Method try_into_utf8

crates/vm/src/builtins/str.rs:1523–1526

(self, vm: &VirtualMachine)

    }

    pub fn try_into_utf8(self, vm: &VirtualMachine) -> PyResult<PyRef<PyUtf8Str>> {
        self.ensure_valid_utf8(vm)?;
        Ok(unsafe { mem::transmute::<Self, PyRef<PyUtf8Str>>(self) })
    }
}

struct CharLenStr<'a>(&'a str, usize);