1 files changed, 17 insertions, 1 deletions
diff --git a/spec/ruby/core/proc/arity_spec.rb b/spec/ruby/core/proc/arity_spec.rb
index 251710a663..5c7728cb30 100644
--- a/spec/ruby/core/proc/arity_spec.rb
+++ b/spec/ruby/core/proc/arity_spec.rb
@@ -1,4 +1,4 @@
-require File.expand_path('../../../spec_helper', __FILE__)
+require_relative '../../spec_helper'
 
 describe "Proc#arity" do
   SpecEvaluate.desc = "for definition"
@@ -268,6 +268,14 @@ describe "Proc#arity" do
         @a.arity.should == 3
         @b.arity.should == 3
       end
+
+      # implicit rest
+      evaluate <<-ruby do
+          @a = lambda { |a, | }
+      ruby
+
+        @a.arity.should == 1
+      end
     end
 
     context "returns negative values" do
@@ -530,6 +538,14 @@ describe "Proc#arity" do
         @a.arity.should == 1
         @b.arity.should == 5
       end
+
+      # implicit rest
+      evaluate <<-ruby do
+          @a = proc { |a, | }
+      ruby
+
+        @a.arity.should == 1
+      end
     end
 
     context "returns negative values" do