[glib] glib-compile-schemas: Improve an error message

[Matthias Clasen <matthiasc src gnome org>]

commit 074fe89f226d4c0f3c6bdd48b6b03c8051fbaf75
Author: Matthias Clasen <mclasen redhat com>
Date:   Fri May 15 22:53:41 2015 -0400

    glib-compile-schemas: Improve an error message
    
    Mention the expected type when failing to parse a GVariant.

 gio/glib-compile-schemas.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)
---
diff --git a/gio/glib-compile-schemas.c b/gio/glib-compile-schemas.c
index 31161fb..2262a3f 100644
--- a/gio/glib-compile-schemas.c
+++ b/gio/glib-compile-schemas.c
@@ -469,6 +469,13 @@ key_state_end_default (KeyState  *state,
   state->default_value = g_variant_parse (state->type,
                                           state->unparsed_default_value->str,
                                           NULL, NULL, error);
+  if (!state->default_value)
+    {
+      gchar *type = g_variant_type_dup_string (state->type);
+      g_prefix_error (error, "failed to parse <default> value of type '%s': ", type);
+      g_free (type);
+    }
+
   key_state_check_range (state, error);
 }