[vala/0.34] Fix broken destruction of null-terminated arrays in async data structs

[Rico Tzschichholz <ricotz src gnome org>]

commit f554160c6f54b151e3bf0acc1b214a3a38c05da8
Author: Richard Wiedenhöft <richard wiedenhoeft xyz>
Date:   Sun Feb 28 18:19:29 2016 +0100

    Fix broken destruction of null-terminated arrays in async data structs
    
    https://bugzilla.gnome.org/show_bug.cgi?id=762819

 codegen/valagasyncmodule.vala     |   12 +++++++++---
 tests/Makefile.am                 |    1 +
 tests/asynchronous/bug762819.vala |   22 ++++++++++++++++++++++
 3 files changed, 32 insertions(+), 3 deletions(-)
---
diff --git a/codegen/valagasyncmodule.vala b/codegen/valagasyncmodule.vala
index 928e67b..0ab4336 100644
--- a/codegen/valagasyncmodule.vala
+++ b/codegen/valagasyncmodule.vala
@@ -123,9 +123,15 @@ public class Vala.GAsyncModule : GtkModule {
                }
 
                if (requires_destroy (m.return_type)) {
-                       /* this is very evil. */
-                       var v = new LocalVariable (m.return_type, ".result");
-                       ccode.add_expression (destroy_local (v));
+                       if (get_ccode_array_length (m) || !(m.return_type is ArrayType)) {
+                               /* this is very evil. */
+                               var v = new LocalVariable (m.return_type, ".result");
+                               ccode.add_expression (destroy_local (v));
+                       } else {
+                               var v = new GLibValue (m.return_type, new CCodeIdentifier ("_data_->result"), 
true);
+                               v.array_null_terminated = get_ccode_array_null_terminated (m);
+                               ccode.add_expression (destroy_value (v));
+                       }
                }
 
                if (m.binding == MemberBinding.INSTANCE) {
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 023d95e..487c990 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -204,6 +204,7 @@ TESTS = \
        asynchronous/bug659886.vala \
        asynchronous/bug661961.vala \
        asynchronous/bug742621.vala \
+       asynchronous/bug762819.vala \
        asynchronous/closures.vala \
        dbus/basic-types.test \
        dbus/arrays.test \
diff --git a/tests/asynchronous/bug762819.vala b/tests/asynchronous/bug762819.vala
new file mode 100644
index 0000000..ea0f194
--- /dev/null
+++ b/tests/asynchronous/bug762819.vala
@@ -0,0 +1,22 @@
+abstract class Bar : GLib.Object {
+       [CCode (array_length = false, array_null_terminated = true)]
+       public abstract async string[] get_string_async ();
+}
+
+class Foo : Bar {
+       public override async string[] get_string_async () {
+               return { "foo", "bar" };
+       }
+}
+
+void main () {
+       var loop = new MainLoop ();
+       var foo = new Foo ();
+       foo.get_string_async.begin ((obj, res) => {
+               var result = foo.get_string_async.end (res);
+               assert (result.length == 2);
+               assert (result[1] == "bar");
+               loop.quit ();
+       });
+       loop.run ();
+}