[vala/0.40] vala: Variadic parameters are not supported for async methods

[Rico Tzschichholz <ricotz src gnome org>]

commit b039a93d080d2448874be0c7de180730e7ab9fa0
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Tue Mar 19 08:09:35 2019 +0100

    vala: Variadic parameters are not supported for async methods

 tests/Makefile.am                          | 2 ++
 tests/asynchronous/variadic-invalid-2.test | 7 +++++++
 tests/asynchronous/variadic-invalid.test   | 7 +++++++
 vala/valamethod.vala                       | 5 +++++
 4 files changed, 21 insertions(+)
---
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 9328a9f54..74c6ce6dc 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -395,6 +395,8 @@ TESTS = \
        asynchronous/closures.vala \
        asynchronous/generator.vala \
        asynchronous/result-pos.vala \
+       asynchronous/variadic-invalid.test \
+       asynchronous/variadic-invalid-2.test \
        asynchronous/yield.vala \
        generics/constructor-chain-up.vala \
        generics/inference-static-function.vala \
diff --git a/tests/asynchronous/variadic-invalid-2.test b/tests/asynchronous/variadic-invalid-2.test
new file mode 100644
index 000000000..cf4ee9705
--- /dev/null
+++ b/tests/asynchronous/variadic-invalid-2.test
@@ -0,0 +1,7 @@
+Invalid Code
+
+async void foo (string first, va_list vals) {
+}
+
+void main () {
+}
diff --git a/tests/asynchronous/variadic-invalid.test b/tests/asynchronous/variadic-invalid.test
new file mode 100644
index 000000000..2e62113ad
--- /dev/null
+++ b/tests/asynchronous/variadic-invalid.test
@@ -0,0 +1,7 @@
+Invalid Code
+
+async void foo (string first, ...) {
+}
+
+void main () {
+}
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index c6e6b3831..bbdcbaffd 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -730,6 +730,11 @@ public class Vala.Method : Subroutine, Callable {
                                error = true;
                                Report.error (param.source_reference, "Reference parameters are not supported 
for async methods");
                        }
+                       if (!external_package && coroutine && (param.ellipsis || 
param.variable_type.data_type == context.analyzer.va_list_type.data_type)) {
+                               error = true;
+                               Report.error (param.source_reference, "Variadic parameters are not supported 
for async methods");
+                               return false;
+                       }
                        // TODO: begin and end parameters must be checked separately for coroutines
                        if (coroutine) {
                                continue;