[ruby-core:96026] [Ruby master Bug#16366] .count on endless range causes infinite loop

Issue #16366 has been updated by ko1 (Koichi Sasada).


I introduce general solution.

Notes:

* there are no "(1..).count" test. can anyone write it?
* My fix can introduce additional problems because it increases interrupt points. Please report us if you find a problem on your app.
* My fix can introduce additional overhead (checking interrupts). I tried to reduce this overhead by rewriting checking code, however, the original code (no modification code) is fastest :p

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Bug #16366: .count on endless range causes infinite loop
https://bugs.ruby-lang.org/issues/16366#change-82874

* Author: duffyjp (Jacob Duffy)
* Status: Closed
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.6.5p114 (2019-10-01 revision 67812) [x86_64-darwin19]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN
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Out of curiosity, I tried:

``` ruby
(1..).count
```

Which resulted in an unkillable 100% CPU irb session. 

I expected either an exception or maybe `Infinity`

Thanks

---Files--------------------------------
enum_count_pass-16366.patch (765 Bytes)


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