Re-export chainrules-core and add Neg bound to ScalarAd#1
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Downstream crates can now depend on `chainrules` alone to get core traits (Differentiable, ReverseRule, ForwardRule, etc.). Adding `Neg` to `ScalarAd` removes the `neg_one()` helper and `from_i32(-1) *` workarounds, making negation idiomatic (`-x` instead of `-1 * x`). Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
chainrules-corepublic types fromchainrules: downstream crates can depend onchainrulesalone to accessDifferentiable,ReverseRule,ForwardRule,AutodiffError,NodeId, etc.Neg<Output = Self>bound toScalarAd: enables idiomatic-xsyntax, removingneg_one()helper andS::from_i32(-1) * ...workarounds insub_rrule,div_frule/div_rrule,cos_frule/cos_rrule,acos_frule/acos_rrule.Test plan
cargo nextest run --release --workspace— all 60 tests passcargo test --doc --release --workspace— all doc tests passcargo clippy --workspace— no warnings🤖 Generated with Claude Code