1 files changed, 11 insertions, 3 deletions
diff --git a/libgo/go/debug/gosym/symtab.go b/libgo/go/debug/gosym/symtab.go
index a84b7f6def1..3be612e1df7 100644
--- a/libgo/go/debug/gosym/symtab.go
+++ b/libgo/go/debug/gosym/symtab.go
@@ -35,13 +35,21 @@ func (s *Sym) Static() bool { return s.Type >= 'a' }
 // PackageName returns the package part of the symbol name,
 // or the empty string if there is none.
 func (s *Sym) PackageName() string {
-	pathend := strings.LastIndex(s.Name, "/")
+	name := s.Name
+
+	// A prefix of "type." and "go." is a compiler-generated symbol that doesn't belong to any package.
+	// See variable reservedimports in cmd/compile/internal/gc/subr.go
+	if strings.HasPrefix(name, "go.") || strings.HasPrefix(name, "type.") {
+		return ""
+	}
+
+	pathend := strings.LastIndex(name, "/")
 	if pathend < 0 {
 		pathend = 0
 	}
 
-	if i := strings.Index(s.Name[pathend:], "."); i != -1 {
-		return s.Name[:pathend+i]
+	if i := strings.Index(name[pathend:], "."); i != -1 {
+		return name[:pathend+i]
 	}
 	return ""
 }