[Vala] Unnecessary g_strdup and compile error.

[Kentaro NAKAZAWA <kentaro nakazawa nifty com>]

Hello,
(sorry, my English is not so good ;)

I often write the following codes.
----------------------------------------------------------------
void main () {
    var home = Environment.get_home_dir ();
    print ("%s\n", home);
}
----------------------------------------------------------------

Then, unnecessary g_strdup is generated. 
----------------------------------------------------------------
void _vala_main (void) {
    const gchar* _tmp0_ = NULL;
    gchar* _tmp1_;
    gchar* home;
    _tmp0_ = g_get_home_dir ();
    _tmp1_ = g_strdup (_tmp0_);
    home = _tmp1_;
    g_print ("%s\n", home);
    _g_free0 (home);
}
----------------------------------------------------------------

It is necessary to write a tedious following codes to avoid it. 
----------------------------------------------------------------
void main () {
    unowned string home = Environment.get_home_dir ();
    print ("%s\n", home);
}
----------------------------------------------------------------

Is not unnecessary g_strdup generated without writing a tedious code?

After that, if the following codes are written, it becomes a compile error. (Vala 0.11.2)
----------------------------------------------------------------
void main () {
    const string home = Environment.get_home_dir ();
    print ("%s\n", home);
}
----------------------------------------------------------------

/home/kentaro/work/VALA/unnecessary_strdup.vala.c: In function '_vala_main':
/home/kentaro/work/VALA/unnecessary_strdup.vala.c:18: error: invalid initializer
error: cc exited with status 256
Compilation failed: 1 error(s), 0 warning(s)

Best regards,

-- 
Kentaro NAKAZAWA (from Japan)