2 files changed, 13 insertions, 0 deletions
diff --git a/src/go/token/position.go b/src/go/token/position.go
index 37a468012d..4fb8031eea 100644
--- a/src/go/token/position.go
+++ b/src/go/token/position.go
@@ -112,6 +112,11 @@ type File struct {
 	infos []lineInfo
 }
 
+// String returns a brief description of the File.
+func (f *File) String() string {
+	return fmt.Sprintf("%s(%d-%d)", f.Name(), f.Base(), f.End())
+}
+
 // Name returns the file name of file f as registered with AddFile.
 func (f *File) Name() string {
 	return f.name
diff --git a/src/go/token/position_test.go b/src/go/token/position_test.go
index 3d02068ebf..7971006ce5 100644
--- a/src/go/token/position_test.go
+++ b/src/go/token/position_test.go
@@ -651,3 +651,11 @@ func TestFile_End(t *testing.T) {
 		t.Errorf("Base, End = %s, want %s", got, want)
 	}
 }
+
+func TestFile_String(t *testing.T) {
+	f := NewFileSet().AddFile("a.go", 100, 42)
+	got := f.String()
+	if want := "a.go(100-142)"; got != want {
+		t.Errorf("String = %q, want %q", got, want)
+	}
+}