[Merb for Ruby19] should not use multiple assignment in conditional in route

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### Problem
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Merb::Router.compiled_statement generates invalid ruby codes

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### Detail
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% merb -i
Loading /Users/maiha/ruby19/test/config/environments/development.rb
[" ~ Connecting to database...\n"][" ~ Parent pid: 44727\n"][" ~ Compiling routes...\n"][" ~ Skipped add
ing slice merb_auth_slice_password to router...\n"]
Generated code failed: def match(request)
  cached_path = request.path.to_s
  if (/^\/([^\/.,;?]+)(?:\/([^\/.,;?]+)(?:\/([^\/.,;?]+))?)?(?:\.([^\/.,;?]+))?$/ =~ cached_path  && ((p
ath1, path2, path3, path4 = $1, $2, $3, $4) || true))
    [0, {:controller => (path1), :action => (path2 || "index"), :id => (path3), :format => (path4)}]
  else
    [nil, {}]
  end
end
[" ~ Cannot load /Users/maiha/ruby19/test/config/router.rb because of syntax error: Generated Code for Router:7: multiple assignment in conditional\n"]irb: warn: can't alias context from irb_context.

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### Goal
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It should be like this.

def match(request)
  cached_path = request.path.to_s
  if (/^\/([^\/.,;?]+)(?:\/([^\/.,;?]+)(?:\/([^\/.,;?]+))?)?(?:\.([^\/.,;?]+))?$/ =~ cached_path
    path1, path2, path3, path4 = $1, $2, $3, $4
    [0, {:controller => (path1), :action => (path2 || "index"), :id => (path3), :format => (path4)}] 
  else
    [nil, {}]
  end
end

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### Status
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Gave up

merb-core/lib/merb-core/dispatch/router/route.rb is heavy to me