Fixed incomplete type declaration

spec/list_spec.cr

@@ -56,4 +56,13 @@ describe "GList" do
     list.each { |s| res << s }
     res.should eq(%w(one two))
   end
+
+  describe "ListStore" do
+    it "can splice an array" do
+      list_store = Gio::ListStore.new(Test::Subject.g_type)
+      one = Test::Subject.new
+      items = [one]
+      list_store.splice(position: 0_u32, n_removals: 0_u32, additions: items)
+    end
+  end
 end

src/generator/wrapper_util.cr

@@ -16,6 +16,7 @@ module Generator
     # FIXME: Possible buffer overflow... need to be sure we send a null terminated array if needed
     def generate_array_to_unsafe(io : IO, identifier : String, type : TypeInfo)
       param_type = type.param_type
+      lib_ptype = to_lib_type(param_type)
       tag = param_type.tag
 
       io << identifier << ".to_a"
@@ -26,13 +27,12 @@ module Generator
         else
           # FIXME: This is copying too much and can be optimized
           #        Main use case of this are methods receiving an array of GValues
-          lib_ptype = to_lib_type(param_type)
           io << ".map { |_i| " << ptype_name << ".new(_i).to_unsafe.as(Pointer(" << lib_ptype << ")).value }"
         end
       elsif tag.interface? || tag.utf8? || tag.filename?
         io << ".map(&.to_unsafe)"
       end
-      io << ".to_unsafe\n"
+      io << ".to_unsafe.as(Pointer(" << lib_ptype << "))\n"
     end
   end
 end