[ruby-core:71362] [Ruby trunk - Bug #11663] Segfault when using multiple keywords if the first keyword is invalid

Issue #11663 has been updated by Nobuyoshi Nakada.

Description updated
Backport changed from 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN to 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED

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Bug #11663: Segfault when using multiple keywords if the first keyword is invalid
https://bugs.ruby-lang.org/issues/11663#change-54728

* Author: Sean MacGahan
* Status: Closed
* Priority: Normal
* Assignee: 
* ruby -v: 2.2.3
* Backport: 2.0.0: DONTNEED, 2.1: DONTNEED, 2.2: REQUIRED
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When loading a method with an invalid keyword (such as one that ends in a question mark), a syntax error occurs as is expected. However, when loading a method with multiple keywords, if the first keyword is invalid then a segmentation fault occurs.

```ruby
def foo(arg1?:) end         #=> syntax error
def foo(arg1?:, arg2) end   #=> syntax error (tIDENTIFIER as expected)
def foo(arg1:) end          #=> no syntax error
def foo(arg1:, arg2?:) end  #=> syntax error
def foo(arg1, arg2?:) end   #=> syntax error

def foo(arg1?:, arg2:) end  #=> segfault
def foo(arg1?:, arg2?:) end #=> segfault
```



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