Fix opt table to use labels

lib/syntax_tree/yarv/compiler.rb

@@ -1278,12 +1278,17 @@ def visit_params(node)
           iseq.argument_size += 1
 
           unless iseq.argument_options.key?(:opt)
-            iseq.argument_options[:opt] = [iseq.label_at_index]
+            start_label = iseq.label
+            iseq.push(start_label)
+            iseq.argument_options[:opt] = [start_label]
           end
 
           visit(value)
           iseq.setlocal(index, 0)
-          iseq.argument_options[:opt] << iseq.label_at_index
+
+          arg_given_label = iseq.label
+          iseq.push(arg_given_label)
+          iseq.argument_options[:opt] << arg_given_label
         end
 
         visit(node.rest) if node.rest

lib/syntax_tree/yarv/instruction_sequence.rb

@@ -235,6 +235,9 @@ def to_a
           end
         end
 
+        dumped_options = argument_options.dup
+        dumped_options[:opt].map!(&:name) if dumped_options[:opt]
+
         # Next, return the instruction sequence as an array.
         [
           MAGIC,
@@ -252,7 +255,7 @@ def to_a
           location.start_line,
           type,
           local_table.names,
-          argument_options,
+          dumped_options,
           [],
           dumped
         ]
@@ -308,10 +311,6 @@ def push(insn)
         end
       end
 
-      def label_at_index
-        push(:"label_#{length}")
-      end
-
       def event(name)
         push(name)
       end
@@ -767,6 +766,11 @@ def toregexp(options, length)
       def self.from(source, options = Compiler::Options.new, parent_iseq = nil)
         iseq = new(source[9], source[5], parent_iseq, Location.default, options)
 
+        # set up the labels object so that the labels are shared between the
+        # location in the instruction sequence and the instructions that
+        # reference them
+        labels = Hash.new { |hash, name| hash[name] = Label.new(name) }
+
         # set up the correct argument size
         iseq.argument_size = source[4][:arg_size]
 
@@ -775,11 +779,9 @@ def self.from(source, options = Compiler::Options.new, parent_iseq = nil)
 
         # set up the argument options
         iseq.argument_options.merge!(source[11])
-
-        # set up the labels object so that the labels are shared between the
-        # location in the instruction sequence and the instructions that
-        # reference them
-        labels = Hash.new { |hash, name| hash[name] = Label.new(name) }
+        if iseq.argument_options[:opt]
+          iseq.argument_options[:opt].map! { |opt| labels[opt] }
+        end
 
         # set up all of the instructions
         source[13].each do |insn|