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auto lambda = [](int x) { return x + 3; };
 
namespace NS { class CL{}; }
 
void func(NS::CL& c) {}
 
int main() { func(lambda); }
 
 
 
/* MSVC 2010 error message:
 *
 * lambderp.cpp(7) : error C2664: 'func' : cannot convert parameter 1 from
 * '`anonymous-namespace'::<lambda0>' to 'NS::CL &'
 *
 *
 * MSVC 2015 error message:
 *
 * lambderp.cpp(7): error C2664: 'void func(NS::CL &)': cannot convert argument 1 from
 * '<lambda_fa8b6adcd63ef1ed2107ab0e1400907b>' to 'NS::CL &'
 */

prog.cpp: In function 'int main()':
prog.cpp:7:25: error: invalid initialization of reference of type 'NS::CL&' from expression of type '<lambda(int)>'
 int main() { func(lambda); }
                         ^
prog.cpp:5:6: note: in passing argument 1 of 'void func(NS::CL&)'
 void func(NS::CL& c) {}
      ^

Standard output is empty