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Summary

In FixedList<T, N>::find, the pos label is not incremented in the following while loop

    if (pos >= 0)                                                                                     
    {                                                                                                 
        List_CONST_ACCESS(T, *this, list);                                                            
                                                                                                      
        while (pos < label(N))                                                                        
        {                                                                                             
            if (list[pos] == val)                                                                     
            {                                                                                         
                return pos;                                                                           
            }                                                                          
        }                                                                                             
    }  

Hence, if val is not equal to the initial list[pos], the code will be stuck in an infinite loop.

Possible fixes

Incrementing pos inside the loop should restore the expected behavior.

    if (pos >= 0)                                                                                     
    {                                                                                                 
        List_CONST_ACCESS(T, *this, list);                                                            
                                                                                                      
        while (pos < label(N))                                                                        
        {                                                                                             
            if (list[pos] == val)                                                                     
            {                                                                                         
                return pos;                                                                           
            }                                                                          
            ++pos;
        }                                                                                             
    }