GMOCK ON_CALL how to select right overloaded mock

[zokroj]

Hello,
I am having issues trying to use ON_CALL with overloaded methods. I have something like the following:

MOCK_METHOD(RequestResult, request, (const Type1 a));
MOCK_METHOD(RequestResult, request, (const Type 2 &b));

When I set the ON_CALL like this:
ON_CALL(mock, request(_)).WillByDefault(testing::Invoke([&](){ }));

the compiler is complaining about call to be ambiguous, if I try to use the Matchers:
ON_CALL(mock, request(testing::A<Type1>()).WillByDefault(testing::Invoke([&](){ }));

I get the following:
note: candidate function not viable: no known conversion from 'Matcher<>' to 'const ::testing::internal::WithoutMatchers' for 1st argument

I am using gtest version 1.11 - any hints?

Thanks