In file included from traceimpl_error.cpp:5:
./traceimpl_error.h:20:3: warning: [blink-gc] Class 'TraceImplInlinedWithUntracedMember' has untraced fields that require tracing.
  void Trace(Visitor* visitor) {
  ^
./traceimpl_error.h:25:3: note: [blink-gc] Untraced field 'x_' declared here:
  Member<X> x_;
  ^
./traceimpl_error.h:44:3: warning: [blink-gc] Base class 'Base' of derived class 'TraceImplInlineWithUntracedBase' requires tracing.
  void Trace(Visitor* visitor) override {
  ^
traceimpl_error.cpp:9:1: warning: [blink-gc] Class 'TraceImplExternWithUntracedMember' has untraced fields that require tracing.
void TraceImplExternWithUntracedMember::Trace(Visitor* visitor) {
^
./traceimpl_error.h:34:3: note: [blink-gc] Untraced field 'x_' declared here:
  Member<X> x_;
  ^
traceimpl_error.cpp:13:1: warning: [blink-gc] Base class 'Base' of derived class 'TraceImplExternWithUntracedBase' requires tracing.
void TraceImplExternWithUntracedBase::Trace(Visitor* visitor) {
^
4 warnings generated.
