Problem: update to quickcheck 1.0 fails to compile

[tomtau]

error[E0404]: expected trait, found struct `Gen`
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Error:    --> chain-core/src/state/account.rs:636:25
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    |
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636 |         fn arbitrary<G: Gen>(g: &mut G) -> Self {
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    |                         ^^^ not a trait
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https://github.com/crypto-com/thaler/pull/2434/checks?check_run_id=1669319370#step:7:54