HashSyntax autocorrect breaks some symbols when targeting 2.2 and up

[mvz]

When targeting Ruby 2.2 and up, HashSyntax' autocorrect can produce invalid results. This happens for symbols like :'&&', for which Ruby 2.2 added support with the new hash syntax.

Expected behavior

With TargetRubyVersion: 2.2 in .rubocop.yml, when running rubocop -a, the following code:

{ :'&&' => :foo }

should be corrected to:

{ '&&': :foo }

Actual behavior

The code is changed to:

{ &&: :foo }

This is syntactically invalid.

Steps to reproduce the problem

Create a file .rubocop.yml with:

AllCops:
  TargetRubyVersion: 2.2

Create a file foo.rb with:

{ :'&&' => :foo }

Run rubocop -a.

RuboCop version

This bug occurs with:

0.52.0 (using Parser 2.4.0.2, running on ruby 2.2.6 x86_64-linux)
0.52.0 (using Parser 2.4.0.2, running on ruby 2.3.6 x86_64-linux)
0.52.0 (using Parser 2.4.0.2, running on ruby 2.4.3 x86_64-linux)
0.52.0 (using Parser 2.4.0.2, running on ruby 2.5.0 x86_64-linux)

This bug does not occur with:

0.50.0 (using Parser 2.4.0.0, running on ruby 2.2.6 x86_64-linux)
0.51.0 (using Parser 2.4.0.2, running on ruby 2.4.3 x86_64-linux)

[mvz]

Thanks, @garettarrowood