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Ruby - no implicit conversion of Symbol into Integer

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TypeError: no implicit conversion of Symbol into Integer

配列に対してシンボルでハッシュを呼ぼうとするとエラー

[][:a]
# TypeError: no implicit conversion of Symbol into Integer

TypeError: no implicit conversion of String into Integer

配列に対して文字列でハッシュを呼ぼうとするとエラー

[]["a"]
# TypeError: no implicit conversion of String into Integer

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