diff --git a/compiler/cl/builtin_test.go b/compiler/cl/builtin_test.go
index 657bc6b2..43e6105c 100644
--- a/compiler/cl/builtin_test.go
+++ b/compiler/cl/builtin_test.go
@@ -329,6 +329,12 @@ func TestIntVal(t *testing.T) {
 	intVal(&ssa.Parameter{})
 }
 
+func TestIgnoreName(t *testing.T) {
+	if !ignoreName("runtime/foo.bar") || ignoreName("internal/abi.Type") {
+		t.Fatal("ignoreName failed")
+	}
+}
+
 func TestErrImport(t *testing.T) {
 	var ctx context
 	pkg := types.NewPackage("foo", "foo")
diff --git a/compiler/internal/build/build.go b/compiler/internal/build/build.go
index 6a8f6184..a8aa3f0b 100644
--- a/compiler/internal/build/build.go
+++ b/compiler/internal/build/build.go
@@ -134,9 +134,9 @@ func Do(args []string, conf *Config) ([]Package, error) {
 		cfg.Mode |= packages.NeedForTest
 	}
 
-	if len(overlayFiles) > 0 {
+	if len(llruntime.OverlayFiles) > 0 {
 		cfg.Overlay = make(map[string][]byte)
-		for file, src := range overlayFiles {
+		for file, src := range llruntime.OverlayFiles {
 			overlay := unsafe.Slice(unsafe.StringData(src), len(src))
 			cfg.Overlay[filepath.Join(env.GOROOT(), "src", file)] = overlay
 		}
diff --git a/compiler/internal/build/_overlay/go/parser/resolver.go b/runtime/_overlay/go/parser/resolver.go
similarity index 100%
rename from compiler/internal/build/_overlay/go/parser/resolver.go
rename to runtime/_overlay/go/parser/resolver.go
diff --git a/compiler/internal/build/_overlay/net/textproto/textproto.go b/runtime/_overlay/net/textproto/textproto.go
similarity index 100%
rename from compiler/internal/build/_overlay/net/textproto/textproto.go
rename to runtime/_overlay/net/textproto/textproto.go
diff --git a/compiler/internal/build/_overlay/testing/testing.go b/runtime/_overlay/testing/testing.go
similarity index 100%
rename from compiler/internal/build/_overlay/testing/testing.go
rename to runtime/_overlay/testing/testing.go
diff --git a/runtime/runtime.go b/runtime/build.go
similarity index 87%
rename from runtime/runtime.go
rename to runtime/build.go
index 09bfffc8..37105d9c 100644
--- a/runtime/runtime.go
+++ b/runtime/build.go
@@ -8,7 +8,7 @@ func SkipToBuild(pkgPath string) bool {
 	if _, ok := hasAltPkg[pkgPath]; ok {
 		return false
 	}
-	if _, ok := supportInternal[pkgPath]; ok {
+	if _, ok := supportedInternal[pkgPath]; ok {
 		return false
 	}
 	switch pkgPath {
@@ -27,13 +27,14 @@ func IgnoreName(name string) bool {
 	}
 	*/
 	const internal = "internal/"
-	return (strings.HasPrefix(name, internal) && IsSupportInternal(name)) ||
+	return (strings.HasPrefix(name, internal) && !IsSupportedInternal(name)) ||
 		strings.HasPrefix(name, "runtime/") || strings.HasPrefix(name, "arena.") ||
 		strings.HasPrefix(name, "maps.") || strings.HasPrefix(name, "plugin.")
 }
 
-func IsSupportInternal(path string) (b bool) {
-	_, b = supportInternal[path]
+func IsSupportedInternal(name string) (b bool) {
+	paths := strings.Split(name, ".")
+	_, b = supportedInternal[paths[0]]
 	return
 }
 
@@ -75,7 +76,7 @@ var hasAltPkg = map[string]none{
 	"io":                       {},
 }
 
-var supportInternal = map[string]none{
+var supportedInternal = map[string]none{
 	"internal/abi":             {},
 	"internal/bytealg":         {},
 	"internal/itoa":            {},
diff --git a/compiler/internal/build/overlay.go b/runtime/overlay.go
similarity index 88%
rename from compiler/internal/build/overlay.go
rename to runtime/overlay.go
index fd8ff857..62bbea28 100644
--- a/compiler/internal/build/overlay.go
+++ b/runtime/overlay.go
@@ -1,4 +1,4 @@
-package build
+package runtime
 
 import (
 	_ "embed"
@@ -13,7 +13,7 @@ var testing_testing string
 //go:embed _overlay/net/textproto/textproto.go
 var net_textproto string
 
-var overlayFiles = map[string]string{
+var OverlayFiles = map[string]string{
 	"math/exp_amd64.go":          "package math;",
 	"go/parser/resolver.go":      go_parser_resolver,
 	"testing/testing.go":         testing_testing,