1 files changed, 26 insertions, 0 deletions
diff --git a/llgo/third_party/gofrontend/libgo/go/html/template/template.go b/llgo/third_party/gofrontend/libgo/go/html/template/template.go
index ce6170105cc..bb9140a4daf 100644
--- a/llgo/third_party/gofrontend/libgo/go/html/template/template.go
+++ b/llgo/third_party/gofrontend/libgo/go/html/template/template.go
@@ -51,11 +51,37 @@ func (t *Template) Templates() []*Template {
 	return m
 }
 
+// Option sets options for the template. Options are described by
+// strings, either a simple string or "key=value". There can be at
+// most one equals sign in an option string. If the option string
+// is unrecognized or otherwise invalid, Option panics.
+//
+// Known options:
+//
+// missingkey: Control the behavior during execution if a map is
+// indexed with a key that is not present in the map.
+//	"missingkey=default" or "missingkey=invalid"
+//		The default behavior: Do nothing and continue execution.
+//		If printed, the result of the index operation is the string
+//		"<no value>".
+//	"missingkey=zero"
+//		The operation returns the zero value for the map type's element.
+//	"missingkey=error"
+//		Execution stops immediately with an error.
+//
+func (t *Template) Option(opt ...string) *Template {
+	t.text.Option(opt...)
+	return t
+}
+
 // escape escapes all associated templates.
 func (t *Template) escape() error {
 	t.nameSpace.mu.Lock()
 	defer t.nameSpace.mu.Unlock()
 	if t.escapeErr == nil {
+		if t.Tree == nil {
+			return fmt.Errorf("template: %q is an incomplete or empty template%s", t.Name(), t.text.DefinedTemplates())
+		}
 		if err := escapeTemplate(t, t.text.Root, t.Name()); err != nil {
 			return err
 		}