[ruby-core:91507] [Ruby trunk Bug#15597] syscall not returning true from private_method_defined?

From: nobu@...
Date: 2019-02-11 06:57:43 UTC
List: ruby-core #91507
Issue #15597 has been updated by nobu (Nobuyoshi Nakada).

Status changed from Open to Feedback

What is your OS?
Doesn't `syscall` method always raise a `NotImplementedError`?

----------------------------------------
Bug #15597: syscall not returning true from private_method_defined?
https://bugs.ruby-lang.org/issues/15597#change-76768

* Author: AaronLasseigne (Aaron Lasseigne)
* Status: Feedback
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
`syscode` is a private method on `Object` but when checked with `private_method_defined?` it returns `false`.

Ruby 2.6.1
```
irb(main):001:0> Object.new.private_methods.sort.select { |pm| !Object.private_method_defined?(pm) }
=> [:syscall]
```

Ruby 2.5.3
```
irb(main):001:0> Object.new.private_methods.sort.select { |pm| !Object.private_method_defined?(pm) }
=> []
```



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