clang++ works but g++ doesn't -- Maybe a compiler bug?

clang++ can compile the following code without any error and warning, but g++ always gives me the error "no matching call ..."? Is it a bug of g++ or kind of extensions of clang++?

Code:

#include <algorithm> 

int main() 
{ 
    struct utils 
    { 
        struct int_type 
        { 
            int m_value; 
        }; 

        static int_type& transform_predicate(int_type& x) 
        { 
            x.m_value += 1; 
            return x; 
        } 
    }; 
    static utils::int_type array[1048576]; 
    int i; 

    for(i = 0; i < 1048576; i++) 
        array[i].m_value = i; 

    std::transform(array, array + 1048576, array, utils::transform_predicate); 
    return 0; 
}

Comeau reports several errors concerning "a template argument may not reference a local type".

Looks like you have one line out of place:

Code:

#include <algorithm> 

struct utils 
    { 
        struct int_type 
        { 
            int m_value; 
        }; 

        static int_type& transform_predicate(int_type& x) 
        { 
            x.m_value += 1; 
            return x; 
        } 
    }; 

int main() 
{ 
    
     utils::int_type array[1048576]; 
    int i; 

    for(i = 0; i < 1048576; i++) 
        array[i].m_value = i; 

    std::transform(array, array + 1048576, array, utils::transform_predicate); 
    return 0; 
}

works fine.