[ruby-core:93081] [Ruby trunk Bug#15467] Creating a class with a Cyrillic first symbol in the name leads to a SyntaxError in IRB

Issue #15467 has been updated by jeremyevans0 (Jeremy Evans).

Status changed from Open to Closed

This issue was fixed before 2.7.0-preview1:

```
$ irb27
irb(main):001:0> class Класс
irb(main):001:0> end
=> nil
irb(main):002:0> class ласс
irb(main):002:0> end
Traceback (most recent call last):
        3: from /usr/local/bin/irb27:23:in `<main>'
        2: from /usr/local/bin/irb27:23:in `load'
        1: from /usr/local/lib/ruby/gems/2.7/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
SyntaxError ((irb):2: class/module name must be CONSTANT)
class ласс
      ^~~~~~~~

$ irb26
irb(main):001:0> class Класс
Traceback (most recent call last):
        3: from /usr/local/bin/irb26:23:in `<main>'
        2: from /usr/local/bin/irb26:23:in `load'
        1: from /usr/local/lib/ruby/gems/2.6/gems/irb-1.0.0/exe/irb:11:in `<top (required)>'
SyntaxError ((irb):1: syntax error, unexpected end-of-input, expecting end)
```

----------------------------------------
Bug #15467: Creating a class with a Cyrillic first symbol in the name leads to a SyntaxError in IRB 
https://bugs.ruby-lang.org/issues/15467#change-78497

* Author: an_vlad (Vladislav Andreev)
* Status: Closed
* Priority: Normal
* Assignee: keiju (Keiju Ishitsuka)
* Target version: 
* ruby -v: ruby 2.6.0p0 (2018-12-25 revision 66547) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
**What happens:** a syntax error occurs when a user writes `class Класс` and hits 'Enter' in IRB.

**What is expected to happen:** the same thing that happens when you create a class in IRB with `class SomeClass` line and hit 'Enter'.

**How to reproduce:**

1. Run IRB.
2. Write: `class Класс` and hit 'Enter'.

This leads to a syntax error: `unexpected end-of-input, expecting end`. 

Some details: 
- `class Класс; end` will successfully create a class.
- It seems like having a Cyrillic symbol as the first letter in a class name causes this error: `class ZКласс` works fine.
 



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