void (Set foo, Matcher<Iterable<String>> matcher) { assertThat(<error descr="'assertThat(Test.Matcher<? super java.util.Set>, java.util.Set)' in 'Test' cannot be applied to '(Test.Matcher<java.lang.Iterable<java.lang.String>>, java.util.Set)'">matcher</error>, foo); Matcher<Iterable<String>> b = null; <error descr="Incompatible types. Found: 'Test.Matcher<java.lang.Iterable<java.lang.String>>', required: 'Test.Matcher<? super java.util.Set>'">Matcher<? super Set> a = b;</error> }