Ensure the Return breaks with brackets and not parentheses.

Author: kddnewton

CHANGELOG.md

@@ -37,6 +37,7 @@ The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/) a
 - Allow for the possibility that `CommandCall` nodes might not have arguments.
 - Explicitly handle `?"` so that it formats properly.
 - Check that a block is within the predicate in a more relaxed way.
+- Ensure the `Return` breaks with brackets and not parentheses.
 
 ### Removed
 

lib/syntax_tree.rb

@@ -2930,20 +2930,35 @@ def format(q)
         q.text(keyword)
 
         if arguments.parts.any?
-          if arguments.parts.length == 1 && arguments.parts.first.is_a?(Paren)
-            q.format(arguments)
-          else
-            q.if_break { q.text("(") }
-            q.indent do
-              q.breakable(" ")
+          if arguments.parts.length == 1
+            part = arguments.parts.first
+
+            if part.is_a?(Paren)
+              q.format(arguments)
+            elsif part.is_a?(ArrayLiteral)
+              q.text(" ")
               q.format(arguments)
+            else
+              format_arguments(q, "(", ")")
             end
-            q.breakable("")
-            q.if_break { q.text(")") }
+          else
+            format_arguments(q, " [", "]")
           end
         end
       end
     end
+
+    private
+
+    def format_arguments(q, opening, closing)
+      q.if_break { q.text(opening) }
+      q.indent do
+        q.breakable(" ")
+        q.format(node.arguments)
+      end
+      q.breakable("")
+      q.if_break { q.text(closing) }
+    end
   end
 
   # Break represents using the +break+ keyword.