fix instance var assignment

Author: v0dro

lib/rubex/ast/expression/instance_var.rb

@@ -8,10 +8,12 @@ def initialize(name)
 
         def analyse_types(local_scope)
           @type = DataType::RubyObject.new
+          @has_temp = true
         end
 
         def generate_evaluation_code(code, local_scope)
-          @c_code = "rb_iv_get(#{local_scope.self_name}, \"#{@name}\")"
+          code << "#{@c_code} = rb_iv_get(#{local_scope.self_name}, \"#{@name}\");"
+          code.nl
         end
 
         def generate_assignment_code(rhs, code, local_scope)

spec/fixtures/instance_variables/instance_variables.rubex

@@ -15,7 +15,8 @@ class ToChar
   end
 
   def bar
-    char * b = @foo
+    char * b
+    b = @foo
     return b
   end
 end

spec/instance_variables_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe Rubex, hell: true do
+describe Rubex do
   test_case = "instance_variables"
 
   context "Case: #{test_case}" do