[vala/0.36] Revert "Do not warn about non-default parameters for coroutines."

[Rico Tzschichholz <ricotz src gnome org>]

commit a04af20576df8b50eae13290ab31fd82975d908e
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Jan 18 20:38:47 2018 +0100

    Revert "Do not warn about non-default parameters for coroutines."
    
    Breaks parameter inference for async method overrides.
    
    This reverts commit dd24a1bfe1a78bf1a37d35f5d8dd6480fd4a8941.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=792660

 vala/valamethod.vala |   25 +++++++++++--------------
 1 files changed, 11 insertions(+), 14 deletions(-)
---
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index 1778e77..85f9d46 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -723,20 +723,17 @@ public class Vala.Method : Subroutine, Callable {
                        Report.error (parameters[0].source_reference, "Named parameter required before 
`...'");
                }
 
-               if (!coroutine) {
-                       // TODO: begin and end parameters must be checked separately for coroutines
-                       var optional_param = false;
-                       foreach (Parameter param in parameters) {
-                               param.check (context);
-                               if (coroutine && param.direction == ParameterDirection.REF) {
-                                       error = true;
-                                       Report.error (param.source_reference, "Reference parameters are not 
supported for async methods");
-                               }
-                               if (optional_param && param.initializer == null && !param.ellipsis) {
-                                       Report.warning (param.source_reference, "parameter without default 
follows parameter with default");
-                               } else if (param.initializer != null) {
-                                       optional_param = true;
-                               }
+               var optional_param = false;
+               foreach (Parameter param in parameters) {
+                       param.check (context);
+                       if (coroutine && param.direction == ParameterDirection.REF) {
+                               error = true;
+                               Report.error (param.source_reference, "Reference parameters are not supported 
for async methods");
+                       }
+                       if (optional_param && param.initializer == null && !param.ellipsis) {
+                               Report.warning (param.source_reference, "parameter without default follows 
parameter with default");
+                       } else if (param.initializer != null) {
+                               optional_param = true;
                        }
                }