[Error] Add non-consuming toString (#95375) There are some places that want to convert an Error to string, but still retain the original Error object, for example to emit a non-fatal warning. This currently isn't possible, because the entire Error infra is move-based. And what people end up doing in this case is to move the Error... twice. This patch introduces a toStringWithoutConsuming() function to accommodate this use case. This also requires some infrastructure that allows visiting Errors without consuming them.
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