link_to_if(link_to_unless)を使う時に、link_toの時と同じようにブロックを渡そうとするとエラーになる
<%= link_to_if 条件式, url do %>
<span>エラーになるよ</span>
<% end %>
captureを使うといい感じにできる
<% @contents = capture do %>
<span>うごくよ</span>
<% end %>
<% link_to_if 条件式, @contents, url %>
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