* error.c (name_err_mesg_to_str): clear rb_thread_t::errinfo when

ignore exception under rb_protect().

* test/ruby/test_exception.rb (test_exception_in_name_error_to_str):
  add a corresponding test.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@34028 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

test/ruby/test_exception.rb

@@ -1,4 +1,5 @@
 require 'test/unit'
+require 'tempfile'
 require_relative 'envutil'
 
 class TestException < Test::Unit::TestCase
@@ -363,4 +364,20 @@ end.join
     assert_equal(false, efs.success?, bug5728)
     assert_equal("msg", efs.message, bug5728)
   end
+
+  def test_exception_in_name_error_to_str
+    bug5575 = '[ruby-core:41612]'
+    t = Tempfile.new(["test_exception_in_name_error_to_str", ".rb"])
+    t.puts <<-EOC
+      begin
+        BasicObject.new.inspect
+      rescue
+        $!.inspect
+      end
+    EOC
+    t.close
+    assert_nothing_raised(NameError, bug5575) do
+      load(t.path)
+    end
+  end
 end