Local modifications to variables are not local

[alem0lars]

Expected behavior

When you modify variables inside a local, those modifications should be available only inside the current template.

Actual behavior

The modifications to variables are global, i.e. persisted after processing of the template that modifies the variables is completed.

Steps to reproduce the problem

Reliable way to reproduce the problem:

1. Create a template foo.tt with:

   <% define_locals do
   variable :"distcc.servers", as: :servers
   computed(:info) do
     local!(:servers).map do |server|
       res = server[:host]
       if server.has_key? :opts
         res << ",#{server[:opts].join(",")}"
       end
       res
     end
   end
   end %>

2. Create a template bar.tt

3. When host of servers is accessed inside bar.tt, it shouldn't have the modifications made in foo.tt

Version

Include the output of fizzy version. Here's an example:

$ fizzy version
☞ fizzy version 2.2.0
☞ ruby version ruby 2.4.0p-1

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