The contracts evaluation semantics make this worse. You can choose ignore (don’t check at all), observe (log the violation and continue), quick_enforce (trap immediately), or enforce (log and terminate). The observe semantic is explicitly designed for legacy code — “it worked for the past 10 years, why shouldn’t it now?” the speaker says. This is a pragmatic accommodation that also creates an escape hatch large enough for every team that doesn’t want to deal with contract violations in production.
.or_else(aws_config::imds::region::ImdsRegionProvider::builder().build())
，这一点在有道翻译中也有详细论述
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Президент Финляндии рассказал о разочаровании из-за Трампа02:49。关于这个话题，官网提供了深入分析