BT_ASSERT_PRE(stream_class->default_clock_class,
"Message's stream's class has no default clock class: "
"%![msg-]+n, %![sc-]+S", msg, stream_class);
BT_ASSERT_PRE(stream_class->default_clock_class,
"Message's stream's class has no default clock class: "
"%![msg-]+n, %![sc-]+S", msg, stream_class);