improve error message for duplicate oneof in text parsing
PiperOrigin-RevId: 138128520
diff --git a/proto/text_parser.go b/proto/text_parser.go
index a6bab2f..61f83c1 100644
--- a/proto/text_parser.go
+++ b/proto/text_parser.go
@@ -594,7 +594,7 @@
dst = nv.Elem().Field(0)
field := sv.Field(oop.Field)
if !field.IsNil() {
- return p.errorf("oneof field '%s' is already set", name)
+ return p.errorf("field '%s' would overwrite already parsed oneof '%s'", name, sv.Type().Field(oop.Field).Name)
}
field.Set(nv)
}