Please describe the problem:
Vala doesn't handle generic return types correctly. If a method returns a generic value, the typereplacement is used.

Steps to reproduce:
1. Compile following example:
using GLib;

public static G[] string_list_to_array<G>( List<G> theList )
{
        var ret = new G[theList.length()];
        int counter = 0;
        foreach( G el in theList )
        {
            ret[counter++] = el;
        }
        return ret;
}

public static void main(  )
{
        List<string> l = new List<string>(  );
        l.prepend( "foo" );
        l.prepend( "bar" );
        string[] ls = string_list_to_array<string>( l );
}

Actual results:
vala throws an error:
 Assignment: Cannot convert from `G[]' to `string[]?'

Expected results:
Use correct return value and compiles successful.

Does this happen every time?
yes

Other information: