David Tolnay f441adc89a Generate safe stable code for derives on empty enums ...

Generate `match *self {}` instead of `unsafe { core::intrinsics::unreachable() }`.

This is:

    1. safe
    2. stable

for the benefit of everyone looking at these derived impls through `cargo expand`.

Both expansions compile to the same code at all optimization levels (including `0`).

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..

auxiliary

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derive-no-std.rs

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derive-partialord-correctness.rs

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deriving-all-codegen.rs

Allow more deriving on packed structs.

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deriving-all-codegen.stderr

Allow more deriving on packed structs.

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deriving-all-codegen.stdout

Generate safe stable code for derives on empty enums

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deriving-associated-types.rs

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deriving-bounds.rs

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deriving-clone-array.rs

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deriving-clone-enum.rs

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deriving-clone-generic-enum.rs

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deriving-clone-generic-struct.rs

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deriving-clone-generic-tuple-struct.rs

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deriving-clone-struct.rs

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deriving-clone-tuple-struct.rs

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deriving-cmp-generic-enum.rs

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deriving-cmp-generic-struct-enum.rs

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deriving-cmp-generic-struct.rs

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deriving-cmp-generic-tuple-struct.rs

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deriving-cmp-shortcircuit.rs

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deriving-copyclone.rs

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deriving-default-box.rs

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deriving-default-enum.rs

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deriving-enum-single-variant.rs

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deriving-eq-ord-boxed-slice.rs

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deriving-hash.rs

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deriving-in-fn.rs

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deriving-in-macro.rs

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deriving-meta-multiple.rs

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deriving-meta.rs

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deriving-self-lifetime-totalord-totaleq.rs

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deriving-show-2.rs

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deriving-show.rs

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deriving-via-extension-c-enum.rs

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deriving-via-extension-enum.rs

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deriving-via-extension-hash-enum.rs

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deriving-via-extension-hash-struct.rs

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deriving-via-extension-struct-empty.rs

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deriving-via-extension-struct-like-enum-variant.rs

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deriving-via-extension-struct-tuple.rs

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deriving-via-extension-struct.rs

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deriving-via-extension-type-params.rs

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deriving-with-helper.rs

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deriving-with-repr-packed.rs

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issue-3935.rs

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issue-6341.rs

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issue-15689-1.rs

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issue-15689-2.rs

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issue-19358.rs

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issue-58319.rs

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issue-89188-gat-hrtb.rs

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issue-103157.rs

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issue-103157.stderr

Don't sort strings right after we just sorted by types

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issue-105101.rs

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issue-105101.stderr

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