[vala/0.34] codegen: Don't leak target-reference when casting/assigning owned delegates

[Rico Tzschichholz <ricotz src gnome org>]

commit a0f1f7466b06bd7daa6c5cedaf9a6e812097e2d6
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Wed Mar 22 19:16:06 2017 +0100

    codegen: Don't leak target-reference when casting/assigning owned delegates
    
    Regression of 6d07669384cdb70c3c657dba67d5048212f25da9
    
    https://bugzilla.gnome.org/show_bug.cgi?id=780426

 codegen/valaccodememberaccessmodule.vala |    4 +-
 tests/Makefile.am                        |    1 +
 tests/delegates/casting.vala             |   90 ++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+), 3 deletions(-)
---
diff --git a/codegen/valaccodememberaccessmodule.vala b/codegen/valaccodememberaccessmodule.vala
index e213643..6baf828 100644
--- a/codegen/valaccodememberaccessmodule.vala
+++ b/codegen/valaccodememberaccessmodule.vala
@@ -100,9 +100,7 @@ public abstract class Vala.CCodeMemberAccessModule : CCodeControlFlowModule {
                                        var ref_call = new CCodeFunctionCall (get_dup_func_expression 
(expr.inner.value_type, expr.source_reference));
                                        ref_call.add_argument (delegate_target);
                                        delegate_target = ref_call;
-                                       if (delegate_type != null && delegate_type.is_disposable ()) {
-                                               set_delegate_target_destroy_notify (expr, 
get_destroy_func_expression (expr.inner.value_type));
-                                       }
+                                       set_delegate_target_destroy_notify (expr, get_destroy_func_expression 
(expr.inner.value_type));
                                }
                                set_delegate_target (expr, delegate_target);
                        }
diff --git a/tests/Makefile.am b/tests/Makefile.am
index ee7bad5..9d37314 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -123,6 +123,7 @@ TESTS = \
        structs/bug694140.vala \
        structs/bug749952.vala \
        structs/bug775761.vala \
+       delegates/casting.vala \
        delegates/delegates.vala \
        delegates/reference_transfer.vala \
        delegates/bug539166.vala \
diff --git a/tests/delegates/casting.vala b/tests/delegates/casting.vala
new file mode 100644
index 0000000..5ebbf11
--- /dev/null
+++ b/tests/delegates/casting.vala
@@ -0,0 +1,90 @@
+delegate void FooFunc ();
+
+[CCode (has_target = false)]
+delegate void FooFuncTargetless ();
+
+class Foo : Object {
+       public Foo () {
+               baz (func);
+               assert (ref_count == 1);
+
+               bar (func);
+               assert (ref_count == 1);
+
+               baz ((FooFunc) func);
+               assert (ref_count == 1);
+
+               bar ((FooFunc) func);
+               assert (ref_count == 1);
+
+               man ((FooFuncTargetless) func);
+               assert (ref_count == 1);
+
+               maz ((FooFuncTargetless) func);
+               assert (ref_count == 1);
+       }
+
+       public void func () {
+       }
+
+       void baz (FooFunc f) {
+               assert (ref_count == 1);
+       }
+
+       void bar (owned FooFunc f) {
+               assert (ref_count == 2);
+       }
+
+       void man (FooFuncTargetless f) {
+               assert (ref_count == 1);
+       }
+
+       void maz (owned FooFuncTargetless f) {
+               assert (ref_count == 1);
+       }
+}
+
+void func () {
+}
+
+void main () {
+       var foo = new Foo ();
+       assert (foo.ref_count == 1);
+
+       FooFunc f0 = foo.func;
+       assert (foo.ref_count == 2);
+       f0 = null;
+       assert (foo.ref_count == 1);
+
+       var f1 = (FooFunc) foo.func;
+       assert (foo.ref_count == 2);
+       f1 = null;
+       assert (foo.ref_count == 1);
+
+       unowned FooFunc f2 = foo.func;
+       assert (foo.ref_count == 1);
+       f2 = null;
+       assert (foo.ref_count == 1);
+
+       unowned FooFunc f3 = (FooFunc) foo.func;
+       assert (foo.ref_count == 1);
+       f3 = null;
+       assert (foo.ref_count == 1);
+
+       var f4 = (FooFuncTargetless) foo.func;
+       assert (foo.ref_count == 1);
+       f4 = null;
+       assert (foo.ref_count == 1);
+
+       FooFuncTargetless f5 = func;
+       f5 = null;
+
+       var f6 = (FooFuncTargetless) func;
+       f6 = null;
+
+       unowned FooFuncTargetless f7 = func;
+       f7 = null;
+
+       unowned FooFuncTargetless f8 = (FooFuncTargetless) func;
+       f8 = null;
+}