In file included from class_requires_trace_method_tmpl.cpp:5:
./class_requires_trace_method_tmpl.h:27:1: warning: [blink-gc] Class 'TemplatedObject<blink::PartObjectB>' requires a trace method.
class TemplatedObject {
^
./class_requires_trace_method_tmpl.h:29:5: note: [blink-gc] Untraced field 'm_part' declared here:
    T m_part;
    ^
1 warning generated.