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

ChangeLog

@@ -1,3 +1,14 @@
+Tue Sep  3 07:49:25 2013  Akinori MUSHA  <knu@iDaemons.org>
+
+	* 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.
+
 Tue Sep  3 07:39:58 2013  Tanaka Akira  <akr@fsij.org>
 
 	* bignum.c (bytes_2comp): Define it only for little endian

numeric.c

@@ -1854,6 +1854,9 @@ ruby_num_interval_step_size(VALUE from, VALUE to, VALUE step, int excl)
     }									\
     else {								\
 	/* compatibility */						\
+        if (argc > 1 && NIL_P(step)) {				       	\
+            rb_raise(rb_eTypeError, "step must be numeric");		\
+	}								\
 	if (rb_equal(step, INT2FIX(0))) {				\
 	    rb_raise(rb_eArgError, "step can't be 0");			\
 	}								\

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

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) }