[vala/0.40] girparser: Handle unsupported aliases which could not be fully processed

[Rico Tzschichholz <ricotz src gnome org>]

commit cae9b3eedd3f17dca8c6c37045589f47d54c2b3c
Author: Rico Tzschichholz <ricotz ubuntu com>
Date:   Thu Jul 12 08:51:11 2018 +0200

    girparser: Handle unsupported aliases which could not be fully processed
    
    This avoids criticals for e.g. aliases of error-domains

 vala/valagirparser.vala | 4 ++++
 1 file changed, 4 insertions(+)
---
diff --git a/vala/valagirparser.vala b/vala/valagirparser.vala
index 36e78a8d6..69cb53ebb 100644
--- a/vala/valagirparser.vala
+++ b/vala/valagirparser.vala
@@ -3715,6 +3715,10 @@ public class Vala.GirParser : CodeVisitor {
                        deleg.external = true;
                        
                        alias.symbol = deleg;
+               } else if (type_sym != null) {
+                       Report.warning (alias.source_reference, "alias `%s' for `%s' is not supported".printf 
(alias.get_full_name (), type_sym.get_full_name ()));
+                       alias.symbol = type_sym;
+                       alias.merged = true;
                }
 
                // inherit atributes, like type_id