[Vala] Foreach with lambda: C error

[Marco Trevisan (Treviño) <mail 3v1n0 net>]

I'm trying to use a lambda function as a foreach body for an HashTable:

public void print_hashmap(GLib.HashTable<string,GLib.Value?> map) {
        // ....
        map.foreach((k, v) => {
                string key = (string)k;
                Value val = (Value)v;
                print(@"Foreach k: $key => %s\n",val.strdup_contents());
        });
}

It seems correct and Vala converts it to C, but when compiling my code I
get this error:

test.c: In function ‘_lambda0_’:
test.c:275: error: conversion to non-scalar type requested


My lambda0 function is defined like this in C:

static void _lambda0_ (void* k, void* v, TestClass* self) {
        char* key;
        GValue _tmp0_ = {0};
        GValue val;
        char* _tmp1_;
        char* _tmp2_;
        key = g_strdup ((const char*) k);

// BUGGY LINE BELOW!!!!
        val = G_IS_VALUE (&((GValue) v)) ? (g_value_init (&_tmp0_, G_VALUE_TYPE
(&((GValue) v))), g_value_copy (&((GValue) v), &_tmp0_), _tmp0_) :
((GValue) v);
 
        g_print (_tmp1_ = g_strconcat ("Foreach k: ", string_to_string (key), "
=> %s\n", NULL), _tmp2_ = g_strdup_value_contents (&val));
        _g_free0 (_tmp2_);
        _g_free0 (_tmp1_);
        G_IS_VALUE (&val) ? (g_value_unset (&val), NULL) : NULL;
        _g_free0 (key);
}

Bug? :)