diff --git a/src/go/go2go/go2go.go b/src/go/go2go/go2go.go
index ca9225de97..7bdb71b07c 100644
--- a/src/go/go2go/go2go.go
+++ b/src/go/go2go/go2go.go
@@ -27,13 +27,13 @@ const rewritePrefix = "// Code generated by go2go; DO NOT EDIT.\n\n"
 // them as a single package. It writes out a .go file with any
 // polymorphic code rewritten into normal code.
 func Rewrite(importer *Importer, dir string) error {
-	_, err := rewriteToPkgs(importer, dir)
+	_, err := rewriteToPkgs(importer, "", dir)
 	return err
 }
 
 // rewriteToPkgs rewrites the contents of a single directory,
 // and returns the types.Packages that it computes.
-func rewriteToPkgs(importer *Importer, dir string) ([]*types.Package, error) {
+func rewriteToPkgs(importer *Importer, importPath, dir string) ([]*types.Package, error) {
 	go2files, gofiles, err := go2Files(dir)
 	if err != nil {
 		return nil, err
@@ -43,7 +43,7 @@ func rewriteToPkgs(importer *Importer, dir string) ([]*types.Package, error) {
 		return nil, err
 	}
 
-	return RewriteFiles(importer, dir, go2files)
+	return rewriteFilesInPath(importer, importPath, dir, go2files)
 }
 
 // namedAST holds a file name and the AST parsed from that file.
@@ -54,6 +54,11 @@ type namedAST struct {
 
 // rewriteFiles rewrites a set of .go2 files in dir.
 func RewriteFiles(importer *Importer, dir string, go2files []string) ([]*types.Package, error) {
+	return rewriteFilesInPath(importer, "", dir, go2files)
+}
+
+// rewriteFilesInPath rewrites a set of .go2 files in dir for importPath.
+func rewriteFilesInPath(importer *Importer, importPath, dir string, go2files []string) ([]*types.Package, error) {
 	fset := token.NewFileSet()
 	pkgs, err := parseFiles(dir, go2files, fset)
 	if err != nil {
@@ -62,7 +67,7 @@ func RewriteFiles(importer *Importer, dir string, go2files []string) ([]*types.P
 
 	var rpkgs []*types.Package
 	var tpkgs [][]namedAST
-	for name, pkg := range pkgs {
+	for _, pkg := range pkgs {
 		pkgfiles := make([]namedAST, 0, len(pkg.Files))
 		for n, f := range pkg.Files {
 			pkgfiles = append(pkgfiles, namedAST{n, f})
@@ -77,12 +82,14 @@ func RewriteFiles(importer *Importer, dir string, go2files []string) ([]*types.P
 		}
 
 		conf := types.Config{Importer: importer}
-		tpkg, err := conf.Check(name, fset, asts, importer.info)
+		tpkg, err := conf.Check(pkg.Name, fset, asts, importer.info)
 		if err != nil {
-			return nil, fmt.Errorf("type checking failed for %s: %v", name, err)
+			return nil, fmt.Errorf("type checking failed for %s: %v", pkg.Name, err)
 		}
 
-		importer.register(pkgfiles, tpkg)
+		if !strings.HasSuffix(pkg.Name, "_test") {
+			importer.record(pkgfiles, importPath, tpkg)
+		}
 
 		rpkgs = append(rpkgs, tpkg)
 		tpkgs = append(tpkgs, pkgfiles)
@@ -191,7 +198,7 @@ func checkGoFile(dir, f string) error {
 }
 
 // parseFiles parses a list of .go2 files.
-func parseFiles(dir string, go2files []string, fset *token.FileSet) (map[string]*ast.Package, error) {
+func parseFiles(dir string, go2files []string, fset *token.FileSet) ([]*ast.Package, error) {
 	pkgs := make(map[string]*ast.Package)
 	for _, go2f := range go2files {
 		filename := filepath.Join(dir, go2f)
@@ -211,5 +218,14 @@ func parseFiles(dir string, go2files []string, fset *token.FileSet) (map[string]
 		}
 		pkg.Files[filename] = pf
 	}
-	return pkgs, nil
+
+	rpkgs := make([]*ast.Package, 0, len(pkgs))
+	for _, pkg := range pkgs {
+		rpkgs = append(rpkgs, pkg)
+	}
+	sort.Slice(rpkgs, func(i, j int) bool {
+		return rpkgs[i].Name < rpkgs[j].Name
+	})
+
+	return rpkgs, nil
 }
diff --git a/src/go/go2go/importer.go b/src/go/go2go/importer.go
index 5ee69d572c..49a166887e 100644
--- a/src/go/go2go/importer.go
+++ b/src/go/go2go/importer.go
@@ -151,7 +151,7 @@ func (imp *Importer) ImportFrom(importPath, dir string, mode types.ImportMode) (
 
 	imp.translated[importPath] = tdir
 
-	tpkgs, err := rewriteToPkgs(imp, tdir)
+	tpkgs, err := rewriteToPkgs(imp, importPath, tdir)
 	if err != nil {
 		return nil, err
 	}
@@ -184,6 +184,25 @@ func (imp *Importer) findFromPath(gopath, dir string) string {
 	return ""
 }
 
+// Register registers a package under an import path.
+// This is for tests that use directives like //compiledir.
+func (imp *Importer) Register(importPath string, tpkgs []*types.Package) error {
+	switch len(tpkgs) {
+	case 1:
+		imp.packages[importPath] = tpkgs[0]
+		return nil
+	case 2:
+		if strings.HasSuffix(tpkgs[0].Name(), "_test") {
+			imp.packages[importPath] = tpkgs[1]
+			return nil
+		} else if strings.HasSuffix(tpkgs[1].Name(), "_test") {
+			imp.packages[importPath] = tpkgs[0]
+			return nil
+		}
+	}
+	return fmt.Errorf("unexpected number of packages (%d) for %q", len(tpkgs), importPath)
+}
+
 // localImport handles a local import such as
 //     import "./a"
 // This is for tests that use directives like //compiledir.
@@ -195,13 +214,15 @@ func (imp *Importer) localImport(importPath, dir string) (*types.Package, error)
 	return tpkg, nil
 }
 
-// register records information for a package, for use when working
+// record records information for a package, for use when working
 // with packages that import this one.
-func (imp *Importer) register(pkgfiles []namedAST, tpkg *types.Package) {
-	imp.packages[tpkg.Path()] = tpkg
-	for _, nast := range pkgfiles {
-		imp.addIDs(nast.ast)
+func (imp *Importer) record(pkgfiles []namedAST, importPath string, tpkg *types.Package) {
+	if importPath != "" {
+		imp.packages[importPath] = tpkg
 	}
+       for _, nast := range pkgfiles {
+               imp.addIDs(nast.ast)
+       }
 }
 
 // addIDs finds IDs for generic functions and types and adds them to a map.
diff --git a/test/run.go b/test/run.go
index aa05bda709..b6afcebb96 100644
--- a/test/run.go
+++ b/test/run.go
@@ -233,10 +233,13 @@ func compileFile(runcmd runCmd, longname string, flags []string) (out []byte, er
 func compileInDir(runcmd runCmd, dir string, ft fileType, importer *go2go.Importer, flags []string, localImports bool, names ...string) (out []byte, err error) {
 	gofiles := names
 	if ft == go2Files {
-		_, err := go2go.RewriteFiles(importer, dir, names)
+		tpkgs, err := go2go.RewriteFiles(importer, dir, names)
 		if err != nil {
 			return nil, err
 		}
+		if err := importer.Register(tpkgs[0].Path(), tpkgs); err != nil {
+			return nil, err
+		}
 
 		gofiles = make([]string, len(names))
 		for i, name := range names {