gvariant: Add suggestions for GVariant format strings to error messages

When an unexpected extra parameter is passed to a GVariant variadic
function, it is useful to tell the programmer what format string they
can use for it. This is a first draft, and only covers basic types.

1 files changed, 3 insertions, 3 deletions

diff --git a/tests/gvariant-lookup.c b/tests/gvariant-lookup.c
index 4f07e81..bcbac05 100644
--- a/tests/gvariant-lookup.c
+++ b/tests/gvariant-lookup.c
@@ -54,13 +54,13 @@
 }
 
 /*
- * Unexpected GVariant variadic argument of type 'char *'. Either it should be removed, or a GVariant format string should be added to the format argument to use it. There is no known GVariant representation of the argument’s type, so the argument must be serialized to a GVariant-representable type first.
+ * Unexpected GVariant variadic argument of type 'char *'. Either it should be removed, or a ‘s’ (or other valid) GVariant format string should be added to the format argument to use it.
  *                           "server", "&s", &server_param);
  *                           ^
- * Unexpected GVariant variadic argument of type 'char *'. Either it should be removed, or a GVariant format string should be added to the format argument to use it. There is no known GVariant representation of the argument’s type, so the argument must be serialized to a GVariant-representable type first.
+ * Unexpected GVariant variadic argument of type 'char *'. Either it should be removed, or a ‘s’ (or other valid) GVariant format string should be added to the format argument to use it.
  *                           "server", "&s", &server_param);
  *                                     ^
- * Unexpected GVariant variadic argument of type 'const gchar **' (aka 'const char **'). Either it should be removed, or a GVariant format string should be added to the format argument to use it. There is no known GVariant representation of the argument’s type, so the argument must be serialized to a GVariant-representable type first.
+ * Unexpected GVariant variadic argument of type 'const gchar **' (aka 'const char **'). Either it should be removed, or a ‘^as’ (or other valid) GVariant format string should be added to the format argument to use it.
  *                           "server", "&s", &server_param);
  *                                           ^
  */