#include <vector>
#include <assert.h>

class some_class
{
public:
    bool method()
    {
        using namespace std;
        for ( unsigned i = 0; i < m_values.size(); i++ )
            assert( true );

        vector<unsigned> qwe;
        return true;
    }
private:
    std::vector<unsigned> m_values;
};

int main()
{
    return 0;
}

Compiling...
main.cpp
c:\projects\tstassert\main.cpp(16) : fatal error C1506: unrecoverable block scoping error

Build log was saved at "file://c:\projects\tstassert\Debug\BuildLog.htm"
tstassert - 1 error(s), 0 warning(s)

unrecoverable block scoping error

The block was too large to compile.

Possible causes 

* Mismatched curly braces 
* Unusually large function or class

#include <vector>
#include <cassert>

class some_class
{
public:
  bool method()
  {
    using std::vector;
    for (unsigned i = 0; i < m_values.size(); i++)
      assert(true);

    vector<unsigned> qwe;
    return true;
  }
private:
  std:::vector<unsigned> m_values;
};

int main()
{
  return 0;
}

АГ>Нечего напрягать компилятор

namespace test
{
    class some_class {};
}

int main()
{
    for(int i = 0 ; ;) ;
    using namespace test;
    some_class qwe;
    return 0;
}

F> namespace test
F> {
F> class some_class {};
F> }

F> int main()
F> {
F> for(int i = 0 ; ;) ;
F> using namespace test;
F> some_class qwe;
F> return 0;
F> }
F>

namespace my_ns {

template <typename T>
class Vector
{
};

} // namespace my_ns

void test()
{
  using namespace my_ns;
  for (int i = 0; ; )
    ;
  Vector<int> vec2;
}

namespace my_ns {
  typedef int Vector;
} // namespace my_ns

void test()
{
  using namespace my_ns;
  for (int i = 0; ; )
    ;
  int s = sizeof(Vector);
}