[vala] GAsync: Fix generated sync method variant

[Jürg Billeter <juergbi src gnome org>]

commit a6dc7b4bc17456e1e8d1a800b931722a8b4f31bf
Author: Didier 'Ptitjes <ptitjes free fr>
Date:   Tue Jun 2 05:50:58 2009 +0200

    GAsync: Fix generated sync method variant
    
    Yield statements must be ignored in synchronous variant.
    
    Signed-off-by: Didier 'Ptitjes <ptitjes free fr>

 codegen/valagasyncmodule.vala |    5 +++++
 1 files changed, 5 insertions(+), 0 deletions(-)
---
diff --git a/codegen/valagasyncmodule.vala b/codegen/valagasyncmodule.vala
index 5b4f7f7..c49f6a2 100644
--- a/codegen/valagasyncmodule.vala
+++ b/codegen/valagasyncmodule.vala
@@ -316,6 +316,11 @@ internal class Vala.GAsyncModule : GSignalModule {
 	}
 
 	public override void visit_yield_statement (YieldStatement stmt) {
+		if (current_method == null || !current_method.coroutine) {
+			stmt.ccodenode = new CCodeEmptyStatement ();
+			return;
+		}
+
 		if (stmt.yield_expression == null) {
 			// should be replaced by a simple return FALSE; when we have
 			//     void idle () yields;