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由 Dylan MacKenzie 提交于
This reverts commit 59d21c526c036d7097d05edd6dffdad9c5b1cb62, and uses tuple to store the mutable parts of an EvalContext (which now includes `Machine`). This requires that `Machine` be `Clone`.
788c5f3c
This reverts commit 59d21c526c036d7097d05edd6dffdad9c5b1cb62, and uses tuple to store the mutable parts of an EvalContext (which now includes `Machine`). This requires that `Machine` be `Clone`.