Bug #15444: finite Ranges over Rationals are not iterable

• Status: Closed
• Assignee: mrkn (Kenta Murata)
• Target version: -
• ruby -v: ruby 2.6.0preview3 (2018-11-06 trunk 65578) [x86_64-linux]
• Backport: 2.4: UNKNOWN, 2.5: UNKNOWN

[zvkemp (Zach Kemp)]

Under 2.5.3, finite ranges over rational values are iterable, given a valid step size:

((1/10r)..(1/2r)).step(1/10r).to_a
# => [(1/10), (1/5), (3/10), (2/5), (1/2)]

Under 2.6.0, this is not the case (StopIteration is raised immediately)

((1/10r)..(1/2r)).step(1/10r).to_a
# => []

((1/10r)..(1/2r)).step(1/10r).next
# => StopIteration (iteration reached an end)

However, stepping over an infinite range in 2.6.0 works:

((1/10r)..).step(1/10r).take(5)
# => [(1/10), (1/5), (3/10), (2/5), (1/2)]

Also reproduced on x86_64-darwin17.

[mrkn (Kenta Murata)]

• Status changed from Open to Assigned
• Assignee set to mrkn (Kenta Murata)

[mrkn (Kenta Murata)]

• Status changed from Assigned to Closed

Applied in changeset trunk|r66474.

---

enumerator.c: Fix airth_seq_each for Rational

Fix the wrong uses of rb_int_ge in arith_seq_each.

[ruby-core:90648] [Bug #15444]