[Fix #7] Move error.rb back to rubocop gem

Author: marcandre

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Changes
+
+* `AST::ProcessedSource.from_file` now raises a `Errno::ENOENT` instead of a `RuboCop::Error` [#7]
+
 ## 0.0.2 (2020-05-12)
 
 ### Bug fixes

lib/rubocop/ast.rb

@@ -3,7 +3,6 @@
 require 'parser'
 require 'forwardable'
 
-require_relative 'error'
 require_relative 'node_pattern'
 
 require_relative 'ast/sexp'

lib/rubocop/error.rb

@@ -15,8 +15,6 @@ class ProcessedSource
     def self.from_file(path, ruby_version)
       file = File.read(path, mode: 'rb')
       new(file, ruby_version, path)
-    rescue Errno::ENOENT
-      raise RuboCop::Error, "No such file or directory: #{path}"
     end
 
     def initialize(source, ruby_version, path = nil)

lib/rubocop/processed_source.rb

@@ -32,11 +32,10 @@ def some_method
       end
     end
 
-    it 'raises RuboCop::Error when the file does not exist' do
+    it 'raises a Errno::ENOENT when the file does not exist' do
       expect do
         described_class.from_file('foo', ruby_version)
-      end.to raise_error(RuboCop::Error)
-        .with_message(/No such file or directory/)
+      end.to raise_error(Errno::ENOENT)
     end
   end