Suppress method redefinition warnings

test/ruby/test_iseq.rb

@@ -464,12 +464,13 @@ class TestISeq < Test::Unit::TestCase
     RUBY
 
     iseq_bin = iseq.to_binary
+    iseq = ISeq.load_from_binary(iseq_bin)
     lines = []
     TracePoint.new(tracepoint_type){|tp|
       next unless tp.path == filename
       lines << tp.lineno
     }.enable{
-      ISeq.load_from_binary(iseq_bin).eval
+      EnvUtil.suppress_warning {iseq.eval}
     }
 
     lines

test/test_prime.rb

@@ -269,6 +269,7 @@ class TestPrime < Test::Unit::TestCase
       end
     ensure
       class << Integer
+        remove_method :sqrt
         alias_method :sqrt, :org_sqrt
         remove_method :org_sqrt
       end