1 files changed, 4 insertions, 0 deletions
diff --git a/absl/flags/commandlineflag.h b/absl/flags/commandlineflag.h
index 7e21d05d..f2fa0897 100644
--- a/absl/flags/commandlineflag.h
+++ b/absl/flags/commandlineflag.h
@@ -108,6 +108,10 @@ class CommandLineFlag {
     U u;
 
     Read(&u.value);
+    // allow retired flags to be "read", so we can report invalid access.
+    if (IsRetired()) {
+      return absl::nullopt;
+    }
     return std::move(u.value);
   }