[vala] Report error when using reference parameters in async methods

[Jürg Billeter <juergbi src gnome org>]

commit 8364f59c2226c8c39767ba654d3b30f6f1ab3ea2
Author: Jürg Billeter <j bitron ch>
Date:   Sat Mar 20 12:40:40 2010 +0100

    Report error when using reference parameters in async methods
    
    Fixes bug 610624.

 vala/valamethod.vala |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index 04ec423..795baf0 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -812,6 +812,10 @@ public class Vala.Method : Member {
 
 		foreach (FormalParameter param in parameters) {
 			param.check (analyzer);
+			if (coroutine && param.direction == ParameterDirection.REF) {
+				error = true;
+				Report.error (param.source_reference, "Reference parameters are not supported for async methods");
+			}
 		}
 
 		foreach (DataType error_type in get_error_types ()) {