= private = protected
warn(p1)
Display the given message (followed by a newline) on STDERR unless warnings are disabled (for example with the -W0 flag).
static VALUE rb_warn_m(VALUE self, VALUE mesg) { if (!NIL_P(ruby_verbose)) { rb_io_write(rb_stderr, mesg); rb_io_write(rb_stderr, rb_default_rs); } return Qnil; }