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3ec1ca0516
Use `tcx.require_lang_item` instead of unwrapping lang items I clearly remember esteban telling me that there is `require_lang_item` but he was from a phone atm and I couldn't find it, so I didn't use it. Stumbled on it today, so here we are :)
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.