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diff --git a/web/server/h2o/libh2o/deps/mruby/mrblib/kernel.rb b/web/server/h2o/libh2o/deps/mruby/mrblib/kernel.rb
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+++ b/web/server/h2o/libh2o/deps/mruby/mrblib/kernel.rb
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+##
+# Kernel
+#
+# ISO 15.3.1
+module Kernel
+
+  # 15.3.1.2.1 Kernel.`
+  # provided by Kernel#`
+  # 15.3.1.3.5
+  def `(s)
+    raise NotImplementedError.new("backquotes not implemented")
+  end
+
+  ##
+  # 15.3.1.2.3  Kernel.eval
+  # 15.3.1.3.12 Kernel#eval
+  # NotImplemented by mruby core; use mruby-eval gem
+
+  ##
+  # ISO 15.3.1.2.8 Kernel.loop
+  # provided by Kernel#loop
+
+  ##
+  # Calls the given block repetitively.
+  #
+  # ISO 15.3.1.3.29
+  def loop(&block)
+    return to_enum :loop unless block
+
+    while true
+      yield
+    end
+  rescue StopIteration => e
+    e.result
+  end
+
+  # 11.4.4 Step c)
+  def !~(y)
+    !(self =~ y)
+  end
+
+  # internal method for inspect
+  def _inspect
+    self.inspect
+  end
+
+  def to_enum(*a)
+    raise NotImplementedError.new("fiber required for enumerator")
+  end
+end