optional_gc_object.cpp:14:3: warning: [blink-gc] Disallowed optional field of 'optional<blink::Base>' found; 'Base' is a garbage-collected type. Optional fields cannot hold garbage-collected objects.
  absl::optional<Base> optional_field_;  // Optional fields are disallowed.
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
optional_gc_object.cpp:15:3: warning: [blink-gc] Disallowed optional field of 'optional<blink::Base>' found; 'Base' is a garbage-collected type. Optional fields cannot hold garbage-collected objects.
  std::optional<Base> optional_field2_;
  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
optional_gc_object.cpp:26:5: warning: [blink-gc] Disallowed new-expression of 'optional<blink::Base>' found; 'Base' is a garbage-collected type. GCed types cannot be created with new.
    new absl::optional<Base>;  // New expression with gced optionals are not
    ^~~~~~~~~~~~~~~~~~~~~~~~
optional_gc_object.cpp:37:5: warning: [blink-gc] Disallowed new-expression of 'optional<blink::Base>' found; 'Base' is a garbage-collected type. GCed types cannot be created with new.
    new std::optional<Base>;  // New expression with gced optionals are not
    ^~~~~~~~~~~~~~~~~~~~~~~
4 warnings generated.