[ruby-core:71600] [Ruby trunk - Bug #11718] Constant access on `nil`

Issue #11718 has been updated by Hans Mackowiak.


hm it might be that ```nil::Foo``` is parsed as ```::Foo``` which is doing the top-level access.

but i am not deep enough in the parser to fix that.

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Bug #11718: Constant access on `nil`
https://bugs.ruby-lang.org/issues/11718#change-54983

* Author: Vais Salikhov
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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It is possible to access top-level constants by doing `nil::CONSTANT`, which looks like a bug [according to Matz](https://github.com/opal/opal/issues/1197#issuecomment-158078778). Here are a couple of examples:

```
$ ruby -ve "Foo = 123; p nil::Foo"
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
123
```

```
$ ruby -ve "class A; Foo = 456; end; p nil::A::Foo"
ruby 2.2.3p173 (2015-08-18 revision 51636) [x86_64-linux]
456
```

Thanks!



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