Manage deprecation warnings about keyword argument

test/ruby/test_exception.rb

@@ -1160,6 +1160,7 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
 
   def capture_warning_warn
     verbose = $VERBOSE
+    deprecated = Warning[:deprecated]
     warning = []
 
     ::Warning.class_eval do
@@ -1172,11 +1173,13 @@ $stderr = $stdout; raise "\x82\xa0"') do |outs, errs, status|
     end
 
     $VERBOSE = true
+    Warning[:deprecated] = true
     yield
 
     return warning
   ensure
     $VERBOSE = verbose
+    Warning[:deprecated] = deprecated
 
     ::Warning.class_eval do
       remove_method :warn

vm_args.c

@@ -597,6 +597,8 @@ static st_table *caller_to_callees = 0;
 static VALUE
 rb_warn_check(const rb_execution_context_t * const ec, const rb_iseq_t *const iseq)
 {
+    if (!rb_warning_category_enabled_p(RB_WARN_CATEGORY_DEPRECATED)) return 1;
+
     if (!iseq) return 0;
 
     const st_data_t callee = (st_data_t)(iseq->body->iseq_unique_id * 2);