Allow Any to take a list of matchers

This works like an OR the same way that All works like an AND. If you
pass 0 parameters it works the same way it always has.

gomock/matchers.go

@@ -87,16 +87,35 @@ func GotFormatterAdapter(s GotFormatter, m Matcher) Matcher {
 	}
 }
 
-type anyMatcher struct{}
+type anyMatcher struct {
+	matchers []Matcher
+}
 
-func (anyMatcher) Matches(interface{}) bool {
+func (am anyMatcher) Matches(x interface{}) bool {
+	if len(am.matchers) == 0 {
 		return true
 	}
 
-func (anyMatcher) String() string {
+	for _, m := range am.matchers {
+		if m.Matches(x) {
+			return true
+		}
+	}
+	return false
+}
+
+func (am anyMatcher) String() string {
+	if len(am.matchers) == 0 {
 		return "is anything"
 	}
 
+	ss := make([]string, 0, len(am.matchers))
+	for _, matcher := range am.matchers {
+		ss = append(ss, matcher.String())
+	}
+	return strings.Join(ss, " OR ")
+}
+
 type eqMatcher struct {
 	x interface{}
 }
@@ -273,12 +292,13 @@ func (m inAnyOrderMatcher) String() string {
 
 // Constructors
 
-// All returns a composite Matcher that returns true if and only all of the
+// All returns a composite Matcher that returns true if and only if all of the
 // matchers return true.
 func All(ms ...Matcher) Matcher { return allMatcher{ms} }
 
-// Any returns a matcher that always matches.
-func Any() Matcher { return anyMatcher{} }
+// All returns a composite Matcher that returns true if any of the
+// matchers return true.
+func Any(ms ...Matcher) Matcher { return anyMatcher{ms} }
 
 // Eq returns a matcher that matches on equality.
 //

gomock/matchers_test.go

@@ -36,6 +36,7 @@ func TestMatchers(t *testing.T) {
 		yes, no []e
 	}{
 		{"test Any", gomock.Any(), []e{3, nil, "foo"}, nil},
+		{"test Any", gomock.Any(gomock.Eq(3), gomock.Eq(4)), []e{3, 4}, []e{5}},
 		{"test All", gomock.Eq(4), []e{4}, []e{3, "blah", nil, int64(4)}},
 		{"test Nil", gomock.Nil(),
 			[]e{nil, (error)(nil), (chan bool)(nil), (*int)(nil)},