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C++11 code: #include <functional> #include <iostream> int main() { auto f = [](int x) -> int {return x * x;}; std::cout << f(3) << std::endl; } Press Ctrl and move cursor on f in "f(3)" line ==> I see such tooltip: Variable f: <null>
It was fixed some time ago - now it shows 'lambda' in tooltip. It is not so useful though and can be improved in future