true: threads, debug


# Warning 52 warnings against patterns of the form
#
#   try .. with Invalid_argument "foo" -> ...
#
# because they are fragile. But we want to have them in tests, for the
# Invalid_argument payloads corresponding to exceptions *we* raise, as
# the fact that those fragile tests break then tells us that fragile
# user code would also break (and we want to be alerted when that is
# a risk).
true: warn(-52)

