Use correct, full substs for self type in impl #6723
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Without arbitrary self types, the self type could never refer to the method type parameters, so this wasn't a problem; but with arbitrary self types, it can. This fixes the crash from rust-lang#6668; but it doesn't make method resolution work for these methods.
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Without arbitrary self types, the self type could never refer to the method type parameters, so this wasn't a problem; but with arbitrary self types, it can.
This fixes the crash from #6668; but it doesn't make method resolution work for these methods.