|  | In file included from class_multiple_trace_bases.cpp:5: | 
|  | ./class_multiple_trace_bases.h:22:1: warning: [blink-gc] Class 'Derived' requires a trace method. | 
|  | class Derived : public Base, public Mixin { | 
|  | ^ | 
|  | ./class_multiple_trace_bases.h:22:17: note: [blink-gc] Untraced base class 'Base' declared here: | 
|  | class Derived : public Base, public Mixin { | 
|  | ^ | 
|  | ./class_multiple_trace_bases.h:22:30: note: [blink-gc] Untraced base class 'Mixin' declared here: | 
|  | class Derived : public Base, public Mixin { | 
|  | ^ | 
|  | ./class_multiple_trace_bases.h:22:1: warning: [blink-gc] Class 'Derived' which inherits from GarbageCollectedMixin must locally declare and override trace(Visitor*) | 
|  | class Derived : public Base, public Mixin { | 
|  | ^ | 
|  | 2 warnings generated. |