Rollup merge of #145216 - eval-exec:fix-145125-enum-rustdoc, r=fmease rustdoc: correct negative-to-implicit discriminant display This PR want to fix rust-lang/rust#145125 In: https://github.com/rust-lang/rust/blob/7f7b8ef27d86c865a7ab20c7c42f50811c6a914d/compiler/rustc_middle/src/ty/util.rs#L33-L38 the `Discr`'s `val` field is `u128`, so we can't use `discr.val as i128` to represent `Discr`'s signed value. We should use `Discr`'s `Display` trait to display signed value. https://github.com/rust-lang/rust/blob/7f7b8ef27d86c865a7ab20c7c42f50811c6a914d/compiler/rustc_middle/src/ty/util.rs#L60-L73
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