In file included from virtual_methods.cpp:5: ./virtual_methods.h:17:36: warning: [chromium-style] virtual methods with non-empty bodies shouldn't be declared inline. virtual bool ComplainAboutThis() { return true; } ^ ./virtual_methods.h:23:3: warning: [chromium-style] Overriding method must have "virtual" keyword. void MethodHasNoArguments() override; ^ virtual 2 warnings generated.