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-rw-r--r--numeric.c6
-rw-r--r--range.c3
2 files changed, 8 insertions, 1 deletions
diff --git a/numeric.c b/numeric.c
index ef72491987..da0bad3211 100644
--- a/numeric.c
+++ b/numeric.c
@@ -2654,9 +2654,11 @@ num_step_size(VALUE from, VALUE args, VALUE eobj)
/*
* call-seq:
* num.step(by: step, to: limit) {|i| block } -> self
- * num.step(by: step, to: limit) -> an_enumerator
+ * num.step(by: step, to: limit) -> an_enumerator
+ * num.step(by: step, to: limit) -> an_arithmetic_sequence
* num.step(limit=nil, step=1) {|i| block } -> self
* num.step(limit=nil, step=1) -> an_enumerator
+ * num.step(limit=nil, step=1) -> an_arithmetic_sequence
*
* Invokes the given block with the sequence of numbers starting at +num+,
* incremented by +step+ (defaulted to +1+) on each call.
@@ -2685,6 +2687,8 @@ num_step_size(VALUE from, VALUE args, VALUE eobj)
* and increments itself using the <code>+</code> operator.
*
* If no block is given, an Enumerator is returned instead.
+ * Especially, the enumerator is an Enumerator::ArithmeticSequence
+ * if both +limit+ and +step+ are kind of Numeric or <code>nil</code>.
*
* For example:
*
diff --git a/range.c b/range.c
index 2763b323eb..d781af3f2e 100644
--- a/range.c
+++ b/range.c
@@ -353,6 +353,7 @@ range_step_size(VALUE range, VALUE args, VALUE eobj)
* call-seq:
* rng.step(n=1) {| obj | block } -> rng
* rng.step(n=1) -> an_enumerator
+ * rng.step(n=1) -> an_arithmetic_sequence
*
* Iterates over the range, passing each <code>n</code>th element to the block.
* If begin and end are numeric, +n+ is added for each iteration.
@@ -360,6 +361,8 @@ range_step_size(VALUE range, VALUE args, VALUE eobj)
* range elements.
*
* If no block is given, an enumerator is returned instead.
+ * Especially, the enumerator is an Enumerator::ArithmeticSequence
+ * if begin and end of the range are numeric.
*
* range = Xs.new(1)..Xs.new(10)
* range.step(2) {|x| puts x}