support multi-run for test/ruby/test_proc.rb

Mysterious error:
`remove_method(:foo) if method_defined?(:foo)` raise an exception
`method `foo' not defined in #<Class:#<TestProc:0x000055d12ff154e0>>`
This patch rename the method name foo to foo_arity to solve it.

1 files changed, 3 insertions, 3 deletions

diff --git a/test/ruby/test_proc.rb b/test/ruby/test_proc.rb
index 4177707ddd..b00f42d81a 100644
--- a/test/ruby/test_proc.rb
+++ b/test/ruby/test_proc.rb
@@ -59,10 +59,10 @@ class TestProc < Test::Unit::TestCase
       Proc.new
     end
     meta.class_eval {
-      remove_method(:foo) if method_defined?(:foo)
-      define_method(:foo, b)
+      remove_method(:foo_arity) if method_defined?(:foo_arity)
+      define_method(:foo_arity, b)
     }
-    assert_equal(n, method(:foo).arity)
+    assert_equal(n, method(:foo_arity).arity)
   end
 
   def test_arity