[ruby-core:100470] [Ruby master Bug#17276] Ripper stops tokenizing after keyword as a method parameter

Issue #17276 has been reported by no6v (Nobuhiro IMAI).

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Bug #17276: Ripper stops tokenizing after keyword as a method parameter
https://bugs.ruby-lang.org/issues/17276

* Author: no6v (Nobuhiro IMAI)
* Status: Open
* Priority: Normal
* ruby -v: ruby 3.0.0dev (2020-10-21T00:24:47Z master da25affdac) [x86_64-linux]
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN
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Although these are obviously syntax errors at this time, the following
codes cannot be tokenized correctly by `Ripper.tokenize`.

```
$ cat src.rb
def req(true) end
def opt(true=0) end
def rest(*true) end
def keyrest(**true) end
def block(&true) end
->true{}
->true=0{}
->*true{}
->**true{}
->&true{}
$ ruby -rripper -vlne 'p Ripper.tokenize($_)' src.rb
ruby 3.0.0dev (2020-10-21T00:24:47Z master da25affdac) [x86_64-linux]
["def", " ", "req", "(", "true", ")"]
["def", " ", "opt", "(", "true", "=", "0", ")"]
["def", " ", "rest", "(", "*", "true", ")"]
["def", " ", "keyrest", "(", "**", "true", ")"]
["def", " ", "block", "(", "&", "true", ")"]
["->", "true", "{"]
["->", "true", "=", "0", "{"]
["->", "*", "true", "{"]
["->", "**", "true", "{"]
["->", "&", "true", "{"]
```

`end` and `}` are not shown in result.

This seems to prevent `irb` from determining the continuity of the input.
See: https://github.com/ruby/irb/issues/38




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