code: public static <A> DecomposableMatchBuilder1<Tuple1<A>, A> tuple1(MatchesAny<A> a) {
      List<Matcher<Object>> matchers = Lists.of(ArgumentMatchers.any());
      return new DecomposableMatchBuilder1<Tuple1<A>, A>(matchers, 0, new Tuple1FieldExtractor<>());
    }
docs: Matches a tuple of 1 element.
  
  <p>If matched, the {@code a} value is extracted.