The Warning module contains a single method named warn, and the module extends itself, making Warning.warn available. Warning.warn is called for all warnings issued by Ruby. By default, warnings are printed to $stderr.
By overriding Warning.warn, you can change how warnings are handled by Ruby, either filtering some warnings, and/or outputting warnings somewhere other than $stderr. When Warning.warn is overridden, super can be called to get the default behavior of printing the warning to $stderr.
static VALUE
rb_warning_s_aref(VALUE mod, VALUE category)
{
rb_warning_category_t cat = rb_warning_category_from_name(category);
if (rb_warning_category_enabled_p(cat))
return Qtrue;
return Qfalse;
}
call-seq
Warning[category] -> true or false
Returns the flag to show the warning messages for category. Supported categories are:
:deprecated-
deprecation warnings
-
assignment of non-nil value to
$,and$; -
keyword arguments
-
proc/lambda without block
etc.
:experimental-
experimental features
-
Pattern matching
static VALUE
rb_warning_s_aset(VALUE mod, VALUE category, VALUE flag)
{
unsigned int mask = rb_warning_category_mask(category);
unsigned int disabled = warning_disabled_categories;
if (!RTEST(flag))
disabled |= mask;
else
disabled &= ~mask;
warning_disabled_categories = disabled;
return flag;
}
call-seq
Warning[category] = flag -> flag
Sets the warning flags for category. See Warning.[] for the categories.
static VALUE
rb_warning_s_warn(VALUE mod, VALUE str)
{
Check_Type(str, T_STRING);
rb_must_asciicompat(str);
rb_write_error_str(str);
return Qnil;
}
Writes warning message msg to $stderr. This method is called by Ruby for all emitted warnings.