[ruby-core:84283] [Ruby trunk Bug#14023][Assigned] SyntaxError on array argument and block

Issue #14023 has been updated by naruse (Yui NARUSE).

Status changed from Open to Assigned
Assignee set to nobu (Nobuyoshi Nakada)

This seems regression caused by Bug #13547

```
% RBENV_VERSION=2.3.5 ruby -c -e 'a [] {}'
Syntax OK
% RBENV_VERSION=2.3.5 ruby -c -e '1.upto 2 {|i|p i}'
-e:1: syntax error, unexpected '{', expecting end-of-input
1.upto 2 {|i|p i}
          ^

%  RBENV_VERSION=2.4.1 ruby -c -e 'a [] {}'
Syntax OK
%  RBENV_VERSION=2.4.1 ruby -c -e '1.upto 2 {|i|p i}'
Syntax OK

% ~/local/ruby/bin/ruby -c -e 'a [] {}'
-e:1: syntax error, unexpected '{', expecting end-of-input
a [] {}
     ^
% ~/local/ruby/bin/ruby -c -e '1.upto 2 {|i|p i}'
-e:1: syntax error, unexpected '{', expecting end-of-input
1.upto 2 {|i|p i}
         ^
```

----------------------------------------
Bug #14023: SyntaxError on array argument and block
https://bugs.ruby-lang.org/issues/14023#change-68439

* Author: k0kubun (Takashi Kokubun)
* Status: Assigned
* Priority: Normal
* Assignee: nobu (Nobuyoshi Nakada)
* Target version: 2.5
* ruby -v: ruby 2.5.0preview1 (2017-10-10 trunk 60153) [x86_64-darwin16]
* Backport: 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
~~~
$ RBENV_VERSION=2.4.2 ruby -v
ruby 2.4.2p198 (2017-09-14 revision 59899) [x86_64-darwin16]

$ RBENV_VERSION=2.4.2 ruby -c -e 'a [] {}'
Syntax OK

$ RBENV_VERSION=2.5.0-preview1 ruby -v
ruby 2.5.0preview1 (2017-10-10 trunk 60153) [x86_64-darwin16]

$ RBENV_VERSION=2.5.0-preview1 ruby -c -e 'a [] {}'
-e:1: syntax error, unexpected '{', expecting end-of-input
a [] {}
     ^
~~~

Is this intentional? This causes syntax error on https://github.com/plataformatec/devise/blob/v4.2.0/app/controllers/devise/sessions_controller.rb#L5.



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