[ruby-core:101123] [Ruby master Bug#17345] ripper: nothing raised when assigning to keyword variables

Issue #17345 has been updated by no6v (Nobuhiro IMAI).


Thanks for the quick fix, however `*_error` parser events except `parse_error` seem not to set an error message properly.

```
$ ruby -rripper -ve 'Ripper.lex("nil=1", raise_errors: true)'
ruby 3.0.0dev (2020-11-26T11:14:34Z master f5ca3ff4db) [x86_64-linux]
/home/nov/.rvm/rubies/ruby-head/lib/ruby/3.0.0/ripper/lexer.rb:134:in `parse': #<struct Ripper::Lexer::Elem pos=[1, 0], event=:on_kw, tok="nil", state=END, message=nil> ;#<struct Ripper::Lexer::Elem pos=[1, 3], event=:on_op, tok="=", state=BEG, message=nil> ;#<struct Ripper::Lexer::Elem pos=[1, 4], event=:on_int, tok="1", state=END, message=nil> (SyntaxError)
```


----------------------------------------
Bug #17345: ripper: nothing raised when assigning to keyword variables
https://bugs.ruby-lang.org/issues/17345#change-88802

* Author: no6v (Nobuhiro IMAI)
* Status: Closed
* Priority: Normal
* ruby -v: ruby 3.0.0dev (2020-11-25T04:36:39Z master 00f046ef57) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
----------------------------------------
```ruby
require "ripper"

Ripper.tokenize("retry=1", raise_errors: true)
# => SyntaxError (syntax error, unexpected '=', expecting end-of-input)

Ripper.tokenize("nil=1", raise_errors: true) # => ["nil", "=", "1"]
lexer = Ripper::Lexer.new("nil=1")
lexer.tokenize # => ["nil", "=", "1"]
lexer.error? # => true
lexer.errors # => []
```

Lexer recognizes there was an error, but nothing is set to `errors`.



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