[Vala] Defining a new type

[Dennis Möhlmann <in dev nyda info>]

Hello,

I'm trying to define a new type from a HashTable. The Vala tutorial has 
an example on this, but it seems disfunctional/incomplete and is not 
explained. Based on the example, I tried this:

class LexerDefinition: HashTable<string, LexerNode>  {

        [CCode (has_construct_function = false)]        // ??
        public LexerDefinition() {
                base(str_hash, str_equal);
        }
}


Vala doesn't complain about errors in the above code but c-code 
compilation fails with "too few arguments for function 
g_hash_table_new_full". What am I doing wrong?

Thanks,
  Dennis