Retain behavior of Numeric#step when nil is given as second argument.

* numeric.c (NUM_STEP_SCAN_ARGS): On sencond thought, keep
  Numeral#step backward compatible in that it raises TypeError
  when nil is given as second argument.

* test/ruby/test_float.rb (TestFloat#test_num2dbl): Revert.

* test/ruby/test_numeric.rb (TestNumeric#test_step): Fix test
  cases for the above change.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@42788 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

2 files changed, 5 insertions, 2 deletions

diff --git a/test/ruby/test_float.rb b/test/ruby/test_float.rb
index c55b051832..f011c2b062 100644
--- a/test/ruby/test_float.rb
+++ b/test/ruby/test_float.rb
@@ -561,6 +561,9 @@ class TestFloat < Test::Unit::TestCase
     assert_raise(TypeError) do
       1.0.step(2.0, "0.5") {}
     end
+    assert_raise(TypeError) do
+      1.0.step(2.0, nil) {}
+    end
   end
 
   def test_sleep_with_Float
diff --git a/test/ruby/test_numeric.rb b/test/ruby/test_numeric.rb
index d2f211245d..4e7aef2777 100644
--- a/test/ruby/test_numeric.rb
+++ b/test/ruby/test_numeric.rb
@@ -229,8 +229,8 @@ class TestNumeric < Test::Unit::TestCase
     assert_raise(ArgumentError) { 1.step(10, 0).size }
     assert_raise(TypeError) { 1.step(10, "1") { } }
     assert_raise(TypeError) { 1.step(10, "1").size }
-    assert_nothing_raised { 1.step(10, nil) { } }
-    assert_nothing_raised { 1.step(10, nil).size }
+    assert_raise(TypeError) { 1.step(10, nil) { } }
+    assert_raise(TypeError) { 1.step(10, nil).size }
     assert_nothing_raised { 1.step(by: 0, to: nil) }
     assert_nothing_raised { 1.step(by: 0, to: nil).size }
     assert_nothing_raised { 1.step(by: 0) }