Add more binary operators that are emitted without dot syntax

lib/to_source/visitor.rb

@@ -1706,7 +1706,7 @@ def return(node)
     # @api private
     #
     def process_binary_operator(node)
-      operators = %w(+ - * / & | <<).map(&:to_sym)
+      operators = %w(+ - * / & | << == != =~ !~ > < ** ^).map(&:to_sym)
       return false unless operators.include?(node.name)
       return false if node.arguments.array.length != 1
 

spec/unit/to_source/visitor/class_methods/run_spec.rb

@@ -508,10 +508,14 @@ def foo
   end
 
   context 'binary operators' do
-    %w(+ - * / & | && || <<).each do |operator|
-      context "operator: #{operator}" do
+    %w(+ - * / & | && || << == != < > =~ !~ ^ **).each do |operator|
+      context "operator on literals #{operator}" do
         assert_source "1 #{operator} 2"
       end
+
+#     context "operator on calls #{operator}" do
+#       assert_source "a #{operator} b"
+#     end
     end
   end