diff --git a/go/internal/gccgoimporter/importer19_test.go b/go/internal/gccgoimporter/importer19_test.go
deleted file mode 100644
index 222d66ca..00000000
--- a/go/internal/gccgoimporter/importer19_test.go
+++ /dev/null
@@ -1,16 +0,0 @@
-// Copyright 2017 The Go Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file.
-
-// +build go1.9
-
-package gccgoimporter
-
-var aliasTests = []importerTest{
-	{pkgpath: "aliases", name: "A14", want: "type A14 = func(int, T0) chan T2"},
-	{pkgpath: "aliases", name: "C0", want: "type C0 struct{f1 C1; f2 C1}"},
-}
-
-func init() {
-	importerTests = append(importerTests, aliasTests...)
-}
diff --git a/go/internal/gccgoimporter/importer_test.go b/go/internal/gccgoimporter/importer_test.go
index b04711da..69d20397 100644
--- a/go/internal/gccgoimporter/importer_test.go
+++ b/go/internal/gccgoimporter/importer_test.go
@@ -2,11 +2,9 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package gccgoimporter
+// This is an almost verbatim copy of $GOROOT/src/go/internal/gccgoimporter/importer_test.go.
 
-// This is a verbatim copy of $GOROOT/src/go/internal/gccgoimporter/importer_test.go
-// except for the importerTests variable which does not contain Go1.9-specific tests.
-// Those are added via importer19_test.go.
+package gccgoimporter
 
 import (
 	"go/types"
@@ -104,9 +102,8 @@ var importerTests = []importerTest{
 	{pkgpath: "unicode", name: "IsUpper", want: "func IsUpper(r rune) bool"},
 	{pkgpath: "unicode", name: "MaxRune", want: "const MaxRune untyped rune", wantval: "1114111"},
 	{pkgpath: "imports", wantinits: []string{"imports..import", "fmt..import", "math..import"}},
-	// moved to importer19_test.go (they import interface types)
-	// {pkgpath: "aliases", name: "A14", want: "type A14 = func(int, T0) chan T2"},
-	// {pkgpath: "aliases", name: "C0", want: "type C0 struct{f1 C1; f2 C1}"},
+	{pkgpath: "aliases", name: "A14", want: "type A14 = func(int, T0) chan T2"},
+	{pkgpath: "aliases", name: "C0", want: "type C0 struct{f1 C1; f2 C1}"},
 	{pkgpath: "escapeinfo", name: "NewT", want: "func NewT(data []byte) *T"},
 	{pkgpath: "issue27856", name: "M", want: "type M struct{E F}"},
 }