code review 4635063: mime/multipart: remove newline at top of the multipart.

src/pkg/mime/multipart/writer_test.go

Index: src/pkg/mime/multipart/writer_test.go
===================================================================
--- a/src/pkg/mime/multipart/writer_test.go
+++ b/src/pkg/mime/multipart/writer_test.go
@@ -30,6 +30,13 @@
 		if err != nil {
 			t.Fatalf("Close: %v", err)
 		}
+		s := b.String()
+		if len(s) == 0 {
+			t.Fatal("String: unexpected empty result")
+		}
+		if s[0] == '\r' || s[0] == '\n' {
+			t.Fatal("String: unexpected newline")
+		}
 	}
 
 	r := NewReader(&b, w.Boundary())