[vala/wip/baedert/nullable: 1/25] method: Print encountered type if return types mismatch

[Timm Bäder <baedert src gnome org>]

commit 64b72f3760106f427650f44dfe2e6fa76d7d59f0
Author: Timm Bäder <mail baedert org>
Date:   Sat Nov 5 14:02:16 2016 +0100

    method: Print encountered type if return types mismatch
    
    If a class overrides a method of a base type, print both the encountered
    return type and the return type expected by the base class.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=769501

 vala/valamethod.vala |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/vala/valamethod.vala b/vala/valamethod.vala
index ec35e00..8f8c639 100644
--- a/vala/valamethod.vala
+++ b/vala/valamethod.vala
@@ -344,7 +344,7 @@ public class Vala.Method : Subroutine, Callable {
 
                var actual_base_type = base_method.return_type.get_actual_type (object_type, 
method_type_args, this);
                if (!return_type.equals (actual_base_type)) {
-                       invalid_match = "incompatible return type";
+                       invalid_match = "Base method expected return type `%s', but `%s' was provided".printf 
(actual_base_type.to_qualified_string (), return_type.to_qualified_string ());
                        return false;
                }