Testcase:

//-------------------------------------------
public class TmplClass<K>
{
        public K[]? obj;
        
        public K[]? get_obj()
        {
                return obj;
        }
}
 
void main()
{
        TmplClass<int> test = new TmplClass<int>();
        int[] a;
        a = test.get_obj();     
}
 //-------------------------------------------

Result of compilation:

/tmp/test.vala.c: In function '_vala_main':
/tmp/test.vala.c:280: warning: assignment from incompatible pointer type

Cause of bug:

This bug is caused by translating method TmplClass.get_obj() to returning gpointer* in C, but this gpointer* is not being cast to int** where this method is being called on object of template type TmplClass<int>.

Other effects:

This bug does not make code broken. It only issues not needed warning.