cppcheck false positive unused Function

false-positive-unusedFunction.cpp

#include <functional>
#include <iostream>

int foo() { return 12345; } // FALSE POSITIVE:  unusedFunction

int bar(std::function<int()> func) { return func(); }

class A {
public:
  A() : a(bar([] { return foo(); })) {}
  const int a;
};

int main() {
  std::cout << A().a << std::endl; // Correctly prints 12345
}

$ c++ --std=c++14 bug.cpp && ./a.out
12345
$ cppcheck --std=c++14 --enable=all false-positive-unusedFunction.cpp
Checking bug.cpp ...
[bug.cpp:4]: (style) The function 'foo' is never used.
(information) Cppcheck cannot find all the include files (use --check-config for details)