* [ruby-core:109793] [Ruby master Feature#18986] Raises Exception for Range#last(n) with Float::INFINITY
@ 2022-08-30 19:51 masasakano (Masa Sakano)
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From: masasakano (Masa Sakano) @ 2022-08-30 19:51 UTC (permalink / raw)
To: ruby-core
Issue #18986 has been reported by masasakano (Masa Sakano).
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Feature #18986: Raises Exception for Range#last(n) with Float::INFINITY
https://bugs.ruby-lang.org/issues/18986
* Author: masasakano (Masa Sakano)
* Status: Open
* Priority: Normal
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When a (Numeric) argument is given to `Range#last(n)` for a Range with `Float::INFINITY`, it runs into an infinite loop (see a small code snippet below).
There is no use case for the feature as far as I can think of, and it is hard to detect.
```ruby
(6..Float::INFINITY).last(1) # => infinite loop!!
(6..).last(1) # cannot get the last element of endless range (RangeError)
(-Float::INFINITY..4).last(1) # can't iterate from Float (TypeError)
(..4).last(1) # can't iterate from Float (TypeError)
```
Let me suggest raising an Exception (maybe RangeError, in the same way as an endless Range) when `last(n)` is specified for a Range whose end value is `Float::INFINITY`.
I note `(6..Float::INFINITY).to_a` has the same issue.
--
https://bugs.ruby-lang.org/
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