In file included from class_requires_trace_method_tmpl.cpp:5:
./class_requires_trace_method_tmpl.h:28:1: warning: [blink-gc] Class 'TemplatedObject<blink::PartObjectB>' requires a trace method.
class TemplatedObject {
^
./class_requires_trace_method_tmpl.h:32:3: note: [blink-gc] Untraced field 'm_part' declared here:
  T m_part;
  ^
1 warning generated.