[ruby-core:102469] [Ruby master Bug#17623] endless def can access to outer local variables and lead to unexpected result

Issue #17623 has been updated by mame (Yusuke Endoh).


I cannot reproduce the issue.

```
$ ruby -v
ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-linux]

$ irb
irb(main):001:0* a = 1
=> 1
irb(main):002:1* def f = a
=> :f
irb(main):003:0> f
Traceback (most recent call last):
        5: from /home/mame/local/bin/irb:23:in `<main>'
        4: from /home/mame/local/bin/irb:23:in `load'
        3: from /home/mame/local/lib/ruby/gems/3.0.0/gems/irb-1.3.0/exe/irb:11:in `<top (required)>'
        2: from (irb):3:in `<main>'
        1: from (irb):2:in `f'
NameError (undefined local variable or method `a' for main:Object)
irb(main):004:0>

$ ruby
a = 1
def f = a
f
-:2:in `f': undefined local variable or method `a' for main:Object (NameError)
        from -:3:in `<main>'
```

Does your `.irbrc` have something?

----------------------------------------
Bug #17623: endless def can access to outer local variables and lead to unexpected result
https://bugs.ruby-lang.org/issues/17623#change-90357

* Author: UlyssesZhan (有丘 詹)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x64-mingw32]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
``` ruby
irb(main):001:0> a = 1
=> 1
irb(main):002:0> def f = a
=> :f
irb(main):003:0> f
=> "D:/Ruby30-x64/lib/ruby/gems/3.0.0/gems/irb-1.3.0/exe/irb"
```
I have not idea what it means.
The codes just work fine outside irb.
Maybe it is a bug.



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