Fix an incorrect auto-correct for Style/RedundantParentheses

CHANGELOG.md

@@ -2,6 +2,10 @@
 
 ## master (unreleased)
 
+### Bug fixes
+
+* [#6995](https://github.com/rubocop-hq/rubocop/pull/6995): Fix an incorrect auto-correct for `Style/RedundantParentheses` when enclosed in parentheses at `while-post` or `until-post`. ([@koic][])
+
 ## 0.68.0 (2019-04-29)
 
 ### New features

lib/rubocop/cop/style/redundant_parentheses.rb

@@ -28,6 +28,8 @@ class RedundantParentheses < Cop
 
         def on_begin(node)
           return if !parentheses?(node) || parens_allowed?(node)
+          return if node.parent && (node.parent.while_post_type? ||
+                                    node.parent.until_post_type?)
 
           check(node)
         end

spec/rubocop/cop/style/redundant_parentheses_spec.rb

@@ -197,6 +197,22 @@ def x
     RUBY
   end
 
+  it 'accepts parentheses when enclosed in parentheses at `while-post`' do
+    expect_no_offenses(<<-RUBY.strip_indent)
+      begin
+        do_something
+      end while(bar)
+    RUBY
+  end
+
+  it 'accepts parentheses when enclosed in parentheses at `until-post`' do
+    expect_no_offenses(<<-RUBY.strip_indent)
+      begin
+        do_something
+      end until(bar)
+    RUBY
+  end
+
   it 'accepts parentheses when they touch the preceding keyword' do
     expect_no_offenses('if x; y else(1) end')
   end