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What
従来のRETURN/BREAK/CONTINUE型を廃し、新しく例外機構を利用したreturn/break/continueの処理を実装します。
Why
→solve ラッパーとしてのreturn,break,continueが残ってしまっている #237
→solve valToStrへのtype 'return'の文字列追加 #268
Additional info (optional)
・あくまで評価時のエラーになるため、実行時に評価されない位置にある不正return/breakはエラーになりません。
例:
・今回の実装だと「breakを含む関数」の存在が許容されることになります。
例:
これらは後々修正したほうがいいかもしれません。