refect: Type.String() should use a shortened package name

src/reflect/type.go

@@ -502,7 +502,13 @@ func pointerTo(t *rawType) *rawType {
 
 func (t *rawType) String() string {
 	if t.isNamed() {
-		return t.PkgPath() + "." + t.Name()
+		path := t.PkgPath()
+		slash := len(path) - 1
+		for slash >= 0 && path[slash] != '/' {
+			slash--
+		}
+		shortened := path[slash+1:]
+		return shortened + "." + t.Name()
 	}
 
 	switch t.Kind() {

src/reflect/value_test.go

@@ -1,6 +1,7 @@
 package reflect_test
 
 import (
+	"encoding/base64"
 	. "reflect"
 	"sort"
 	"testing"
@@ -264,6 +265,11 @@ func TestNamedTypes(t *testing.T) {
 	if got, want := ValueOf(m).String(), "<map[[4]uint16]string Value>"; got != want {
 		t.Errorf("Value.String()=%v, want %v", got, want)
 	}
+
+	if got, want := TypeOf(base64.Encoding{}).String(), "base64.Encoding"; got != want {
+		t.Errorf("Type.String(base64.Encoding{})=%v, want %v", got, want)
+	}
+
 }
 
 func TestStruct(t *testing.T) {