Handle { () => () } correctly

mbj · Jan 6, 2014 · 9b237c1 · 9b237c1
1 parent ee348be
commit 9b237c1
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Showing 2 changed files with 8 additions and 1 deletion.
diff --git a/lib/unparser/emitter/begin.rb b/lib/unparser/emitter/begin.rb
@@ -25,6 +25,8 @@ class Implicit < self
 
         handle :begin
 
+        EMPTY_PARENS = [:pair_rocket].to_set.freeze
+
       private
 
         # Perform dispatch
@@ -34,7 +36,11 @@ class Implicit < self
         # @api private
         #
         def dispatch
-          emit_inner
+          if children.empty? && EMPTY_PARENS.include?(parent_type)
+            write('()')
+          else
+            emit_inner
+          end
         end
 
       end # Implicit

diff --git a/spec/unit/unparser_spec.rb b/spec/unit/unparser_spec.rb
@@ -187,6 +187,7 @@ def self.assert_source(input, versions = RUBIES)
 
       context 'hash' do
         assert_source '{}'
+        assert_source '{ () => () }'
         assert_source '{ 1 => 2 }'
         assert_source '{ 1 => 2, 3 => 4 }'