This issue was originally filed by @seaneagan

If we had:

typedef bool Predicate<T>(T item);
interface Matcher<T> extends Predicate<T> {...}

instead of Matcher#matches, thus using "operator call", then the following would work:

collection.some(same(value));
collection.every(isNotNull);
collection.filter(isPositive);

Also, issue #2949 could be solved with:

switch(x) {
  match (isNegative) ...
  case (0) ...
  match (lessThan(5)) ...
  // avoid full blown Matcher since don't need mismatch messages
  match ((i) => i.isEven()) ...
  default ...
}