Googletest export

Mark ACTION_Pn()-generated functions as must-use-result.

This catches when a client creates an action and discards it, thinking that the action has actually been applied to something.

This will help people who make the mistake of defining, for example, both `void Use(Foo*)` and `ACTION(Use) { Use(arg); }` for later application to a Foo.  With such an overload, a client may then write `Use();`, forgetting the param and being confused why nothing happens.

This also catches when a client defines their own action in terms of an ACTION()-generated one, invokes the ACTION's builder, and then fails to invoke the resulting action, thinking it's operating on the outer action's parameters.

PiperOrigin-RevId: 312108101

googlemock/include/gmock/gmock-actions.h

@@ -1512,6 +1512,7 @@ auto InvokeArgumentAdl(AdlTag, F f, Args... args) -> decltype(f(args...)) {
       return_type gmock_PerformImpl(GMOCK_ACTION_ARG_TYPES_AND_NAMES_) const; \
     };                                                                        \
   };                                                                          \
+  inline name##Action name() GTEST_MUST_USE_RESULT_;                          \
   inline name##Action name() { return name##Action(); }                       \
   template <typename F>                                                       \
   template <GMOCK_ACTION_TEMPLATE_ARGS_NAMES_>                                \

googlemock/include/gmock/gmock-generated-actions.h

@@ -442,6 +442,12 @@
     }\
     GMOCK_INTERNAL_DEFN_##value_params\
   };\
+  template <GMOCK_INTERNAL_DECL_##template_params                   \
+            GMOCK_INTERNAL_DECL_TYPE_##value_params>\
+  GMOCK_ACTION_CLASS_(name, value_params)<\
+      GMOCK_INTERNAL_LIST_##template_params\
+      GMOCK_INTERNAL_LIST_TYPE_##value_params> name(\
+          GMOCK_INTERNAL_DECL_##value_params) GTEST_MUST_USE_RESULT_;\
   template <GMOCK_INTERNAL_DECL_##template_params                   \
             GMOCK_INTERNAL_DECL_TYPE_##value_params>\
   inline GMOCK_ACTION_CLASS_(name, value_params)<\

googlemock/include/gmock/gmock-generated-actions.h.pump

@@ -260,6 +260,12 @@ $range k 0..n-1
     }\
     GMOCK_INTERNAL_DEFN_##value_params\
   };\
+  template <GMOCK_INTERNAL_DECL_##template_params                   \
+            GMOCK_INTERNAL_DECL_TYPE_##value_params>\
+  GMOCK_ACTION_CLASS_(name, value_params)<\
+      GMOCK_INTERNAL_LIST_##template_params\
+      GMOCK_INTERNAL_LIST_TYPE_##value_params> name(\
+          GMOCK_INTERNAL_DECL_##value_params) GTEST_MUST_USE_RESULT_;\
   template <GMOCK_INTERNAL_DECL_##template_params                   \
             GMOCK_INTERNAL_DECL_TYPE_##value_params>\
   inline GMOCK_ACTION_CLASS_(name, value_params)<\