reflect: recognize unnamed directional channels

go test github.com/onsi/gomega/gbytes now passes at tip, and tests
added to the reflect package.

Fixes #14645

Change-Id: I16216c1a86211a1103d913237fe6bca5000cf885
Reviewed-on: https://go-review.googlesource.com/20221
Run-TryBot: David Crawshaw <crawshaw@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

src/reflect/all_test.go

@@ -5019,6 +5019,8 @@ var nameTests = []nameTest{
 	{[]D1{}, ""},
 	{(chan D1)(nil), ""},
 	{(func() D1)(nil), ""},
+	{(<-chan D1)(nil), ""},
+	{(chan<- D1)(nil), ""},
 }
 
 func TestNames(t *testing.T) {

src/reflect/set_test.go

@@ -194,11 +194,13 @@ var assignableTests = []struct {
 	{new(*int), new(IntPtr), true},
 	{new(IntPtr), new(*int), true},
 	{new(IntPtr), new(IntPtr1), false},
+	{new(Ch), new(<-chan interface{}), true},
 	// test runs implementsTests too
 }
 
 type IntPtr *int
 type IntPtr1 *int
+type Ch <-chan interface{}
 
 func TestAssignableTo(t *testing.T) {
 	for _, tt := range append(assignableTests, implementsTests...) {

src/reflect/type.go

@@ -563,10 +563,14 @@ func (t *rtype) Name() string {
 	if hasPrefix(t.string, "chan ") {
 		return ""
 	}
+	if hasPrefix(t.string, "chan<-") {
+		return ""
+	}
 	if hasPrefix(t.string, "func(") {
 		return ""
 	}
-	if t.string[0] == '[' || t.string[0] == '*' {
+	switch t.string[0] {
+	case '[', '*', '<':
 		return ""
 	}
 	i := len(t.string) - 1

src/runtime/type.go

@@ -42,10 +42,14 @@ func (t *_type) name() string {
 	if hasPrefix(t._string, "chan ") {
 		return ""
 	}
+	if hasPrefix(t._string, "chan<-") {
+		return ""
+	}
 	if hasPrefix(t._string, "func(") {
 		return ""
 	}
-	if t._string[0] == '[' || t._string[0] == '*' {
+	switch t._string[0] {
+	case '[', '*', '<':
 		return ""
 	}
 	i := len(t._string) - 1