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1fa1f3001f
Clean up `infer_return_ty_for_fn_sig` The code for lowering fn signatures from HIR currently is structured to prefer the recovery path (where users write `-> _`) over the good path. This PR pulls the recovery code out into a separate fn. Review w/o whitespace
For high-level intro to how type checking works in rustc, see the type checking chapter of the rustc dev guide.