[vala/0.40] codegen: Don't pass CCodeCastExpression to NULL-aware free macro

[Rico Tzschichholz <ricotz src gnome org>]

commit 138df94a2f7c4aca9503de9b8e2c281ab00ac94b
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Sun Apr 5 22:24:58 2020 +0200

    codegen: Don't pass CCodeCastExpression to NULL-aware free macro
    
    This resulted in invalid C code:
        error: lvalue required as left operand of assignment
    
    Fixes https://gitlab.gnome.org/GNOME/vala/issues/953

 codegen/valaccodebasemodule.vala               |  5 +++++
 tests/Makefile.am                              |  1 +
 tests/objects/member-initializer-property.vala | 15 +++++++++++++++
 3 files changed, 21 insertions(+)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index e8a27f01d..3d8396fc4 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -3556,6 +3556,11 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
                                cfile.add_type_declaration (new CCodeMacroReplacement.with_expression 
("%s(var)".printf (free0_func), macro));
                        }
 
+                       // FIXME this breaks in our macro, so this should not happen
+                       if (cvar is CCodeCastExpression) {
+                               cvar = ((CCodeCastExpression) cvar).inner;
+                       }
+
                        ccall = new CCodeFunctionCall (new CCodeIdentifier (free0_func));
                        ccall.add_argument (cvar);
                        return ccall;
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 7d3d18577..7c301a26b 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -325,6 +325,7 @@ TESTS = \
        objects/interface-property-delegate.vala \
        objects/interface-property-override.vala \
        objects/member-initializer-base-properties.vala \
+       objects/member-initializer-property.vala \
        objects/member-initializer-property-owned-setter.vala \
        objects/methods.vala \
        objects/paramspec.vala \
diff --git a/tests/objects/member-initializer-property.vala b/tests/objects/member-initializer-property.vala
new file mode 100644
index 000000000..cd71ed010
--- /dev/null
+++ b/tests/objects/member-initializer-property.vala
@@ -0,0 +1,15 @@
+class Baz {
+}
+
+class Bar : Baz {
+}
+
+class Foo {
+       public Baz baz { get; set; }
+}
+
+void main() {
+       var foo = new Foo () {
+               baz = new Bar ()
+       };
+}