time.c: refine num_exact error message

* time.c (num_exact): show the original argument when conversion
  failed, instead of intermediate nil.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@57140 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 10 insertions, 0 deletions

diff --git a/test/ruby/test_time.rb b/test/ruby/test_time.rb
index 60bed87c9c..d3a8645024 100644
--- a/test/ruby/test_time.rb
+++ b/test/ruby/test_time.rb
@@ -1089,4 +1089,14 @@ class TestTime < Test::Unit::TestCase
     t = Time.utc(2017, 1, 1, 1, 0, 0).getlocal("-05:00")
     assert_equal("366", t.strftime("%j"))
   end
+
+  def test_num_exact_error
+    bad = EnvUtil.labeled_class("BadValue").new
+    x = EnvUtil.labeled_class("Inexact") do
+      def to_s; "Inexact"; end
+      define_method(:to_int) {bad}
+      define_method(:to_r) {bad}
+    end.new
+    assert_raise_with_message(TypeError, /Inexact/) {Time.at(x)}
+  end
 end