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Currently our XFAILs are open ended; we do not check that it actually fails, so we have no easy way of knowing that a previously-failing test starts passing. Introduce a new enum that we return from overrides to give us more flexibility here, including the ability to assert that expected failures happen. With the new enum, it is also possible to specify ULP via return value rather than passing a `&mut u32` parameter. This includes refactoring of `precision.rs` to be more accurate about where errors come from, if possible. Fixes: https://github.com/rust-lang/libm/issues/455