docs: def global_matches(self, text):
          """Compute matches when text is a simple name.
          Return a list of all keywords, built-in functions and names currently
          defined in self.namespace that match.
          """
          matches = []
          n = len(text)
          for word in self.namespace:
              if word[:n] == text and word != "__builtins__":
                  matches.append(word)
          return matches