// test.cpp
namespace A
{
void F();
}

int main()
{
    A::F::
    return 0;
}

test.cpp(8) : fatal error C1001: INTERNAL COMPILER ERROR
        (compiler file 'msc1.cpp', line 2844)

C>// test.cpp
C>namespace A
C>{
C>void F();
C>}

C>int main()
C>{
C>    A::F::
C>    return 0;
C>}
C>

C>test.cpp(8) : fatal error C1001: INTERNAL COMPILER ERROR
C>        (compiler file 'msc1.cpp', line 2844) 
C>

test.cpp
test.cpp(10) : error C2589: 'return' : illegal token on right side of '::'
test.cpp(10) : error C2143: syntax error : missing ';' before '::'
test.cpp(11) : warning C4508: 'main' : function should return a value; 'void' return type assumed