codegen: Return CCodeInvalidExpression instead of null

This fixes the following criticals:

  vala_ccode_cast_expression_construct: assertion 'expr != NULL' failed
  vala_ccode_function_call_add_argument: assertion 'expr != NULL' failed

Remove dead code, this is already handled in get_dup_func_expression()

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/semantic/interface-prerequisite-missing-class.test b/tests/semantic/interface-prerequisite-missing-class.test
new file mode 100644
index 000000000..3e4a9e3fb
--- /dev/null
+++ b/tests/semantic/interface-prerequisite-missing-class.test
@@ -0,0 +1,11 @@
+Invalid Code
+
+interface IFoo {
+}
+
+class Foo<T> {
+}
+
+void main () {
+	var foo = new Foo<IFoo> ();
+}