[vala] Support non-null cast for enum values

[Luca Bruno <lucabru src gnome org>]

commit 3fd429ed575333bfcbc1ef88347421e10e136bd4
Author: Luca Bruno <luca bruno immobiliare it>
Date:   Mon Mar 25 13:20:55 2013 +0100

    Support non-null cast for enum values
    
    Fixes bug 673879.

 codegen/valaccodebasemodule.vala |    6 +++---
 tests/Makefile.am                |    1 +
 tests/enums/bug673879.vala       |   12 ++++++++++++
 3 files changed, 16 insertions(+), 3 deletions(-)
---
diff --git a/codegen/valaccodebasemodule.vala b/codegen/valaccodebasemodule.vala
index a8d9e8c..332c9ba 100644
--- a/codegen/valaccodebasemodule.vala
+++ b/codegen/valaccodebasemodule.vala
@@ -5072,9 +5072,9 @@ public abstract class Vala.CCodeBaseModule : CodeGenerator {
                        }
 
                        var innercexpr = get_cvalue (expr.inner);
-                       if (expr.type_reference.data_type is Struct && !expr.type_reference.nullable &&
-                               expr.inner.value_type.data_type is Struct && expr.inner.value_type.nullable) {
-                               // nullable integer or float or boolean or struct cast to non-nullable
+                       if (expr.type_reference is ValueType && !expr.type_reference.nullable &&
+                               expr.inner.value_type is ValueType && expr.inner.value_type.nullable) {
+                               // nullable integer or float or boolean or struct or enum cast to non-nullable
                                innercexpr = new CCodeUnaryExpression 
(CCodeUnaryOperator.POINTER_INDIRECTION, innercexpr);
                        }
                        set_cvalue (expr, new CCodeCastExpression (innercexpr, get_ccode_name 
(expr.type_reference)));
diff --git a/tests/Makefile.am b/tests/Makefile.am
index c11565c..a647bb5 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -63,6 +63,7 @@ TESTS = \
        control-flow/bug652549.vala \
        control-flow/bug665904.vala \
        enums/enums.vala \
+       enums/bug673879.vala \
        structs/structs.vala \
        structs/gvalue.vala \
        structs/bug530605.vala \
diff --git a/tests/enums/bug673879.vala b/tests/enums/bug673879.vala
new file mode 100644
index 0000000..db32ff6
--- /dev/null
+++ b/tests/enums/bug673879.vala
@@ -0,0 +1,12 @@
+enum Test
+{
+    TEST = 10
+}
+
+void main()
+{
+    Test? test = null;
+
+    test = Test.TEST;
+    assert ((!)test == 10);
+}