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3200982b76
Move `Fn*` traits malformedness protections to typeck I found it strange that we were doing a custom well-formedness check just for the `Fn*` traits' `call_*` fn items. My understanding from the git history is that this is just to avoid ICEs later on in typeck. Well, that well-formedness check isn't even implemented correctly for `FnOnce::call_once`, or `FnMut::call_mut` for that matter. Instead, this PR just makes the typeck checks more robust, and leaves it up to the call-site to report errors when lang items are implemented in funny ways. This coincidentally fixes another ICE where a the `Add` lang item is implemented with a `add` item that's a const instead of a method.
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.