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Add `IMPLIED_BOUNDS_ENTAILMENT` lint Implements a lint (#105572) version of the hard-error introduced in #105483. Context is in that PR. r? `@lcnr` cc `@oli-obk` who had asked for this to be a lint first Not sure if this needs to be an FCP, since it's a lint for now.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.