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ラムダ式をfreezeするとそのラムダ式がキャプチャする変数も全てfreezeされる挙動の例に、その変数が参照型である場合を追加した。
参照型はきちんとディープコピーしないと
InvalidMutabilityException
が起きることが分かった。また、
data class
であってもcopy
メソッドはshallow copyしかしないので、deep copyをきちんと行うようにしないと意図しないfreezeを引き起こすことが分かった。