回答編集履歴
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追記
answer
CHANGED
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@@ -14,4 +14,10 @@
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```ruby
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"I'm A. x is I'm B and y is {:key=>true}."
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```
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分かりやすく書くとこういうことでしょうね．
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```ruby
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result = a(b(), {:key => true})
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```
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