codegen: Don't falsly use g_return_val_if_fail() for async creation method

Asynchronous creation methods are represented by 5 functions, "*_new",
"*_new_finish", "*_construct", "*_construct_co" and "*_construct_finish".
The argument checks are emitted in "*_construct" which is a void function
and cannot return any value.

Regression of 43f3e2ca534d082433fbe62aa347b7af443f9f33

Fixes https://gitlab.gnome.org/GNOME/vala/issues/1077

1 files changed, 13 insertions, 0 deletions

diff --git a/tests/asynchronous/constructor-argument-check.vala b/tests/asynchronous/constructor-argument-check.vala
new file mode 100644
index 000000000..22238108a
--- /dev/null
+++ b/tests/asynchronous/constructor-argument-check.vala
@@ -0,0 +1,13 @@
+class Foo {
+	public async Foo (string bar) {
+		assert (bar == "foo");
+	}
+}
+
+async void run () {
+	yield new Foo ("foo");
+}
+
+void main () {
+	run.begin ();
+}