Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 949 insertions, 0 deletions

diff --git a/third_party/rust/enumset_derive/src/lib.rs b/third_party/rust/enumset_derive/src/lib.rs
new file mode 100644
index 0000000000..7508d7546d
--- /dev/null
+++ b/third_party/rust/enumset_derive/src/lib.rs
@@ -0,0 +1,949 @@
+#![recursion_limit = "256"]
+
+extern crate proc_macro;
+
+use darling::util::SpannedValue;
+use darling::*;
+use proc_macro::TokenStream;
+use proc_macro2::{Literal, Span, TokenStream as SynTokenStream};
+use quote::*;
+use std::{collections::HashSet, fmt::Display};
+use syn::spanned::Spanned;
+use syn::{Error, Result, *};
+
+/// Helper function for emitting compile errors.
+fn error<T>(span: Span, message: impl Display) -> Result<T> {
+    Err(Error::new(span, message))
+}
+
+/// Decodes the custom attributes for our custom derive.
+#[derive(FromDeriveInput, Default)]
+#[darling(attributes(enumset), default)]
+struct EnumsetAttrs {
+    no_ops: bool,
+    no_super_impls: bool,
+    #[darling(default)]
+    repr: SpannedValue<Option<String>>,
+    #[darling(default)]
+    serialize_repr: SpannedValue<Option<String>>,
+    serialize_deny_unknown: bool,
+    #[darling(default)]
+    crate_name: Option<String>,
+
+    // legacy options
+    serialize_as_list: SpannedValue<bool>, // replaced with serialize_repr
+    serialize_as_map: SpannedValue<bool>,  // replaced with serialize_repr
+}
+
+/// The internal representation of an enumset.
+#[derive(Copy, Clone)]
+enum InternalRepr {
+    /// internal repr: `u8`
+    U8,
+    /// internal repr: `u16`
+    U16,
+    /// internal repr: `u32`
+    U32,
+    /// internal repr: `u64`
+    U64,
+    /// internal repr: `u128`
+    U128,
+    /// internal repr: `[u64; size]`
+    Array(usize),
+}
+impl InternalRepr {
+    /// Determines the number of variants supported by this repr.
+    fn supported_variants(&self) -> usize {
+        match self {
+            InternalRepr::U8 => 8,
+            InternalRepr::U16 => 16,
+            InternalRepr::U32 => 32,
+            InternalRepr::U64 => 64,
+            InternalRepr::U128 => 128,
+            InternalRepr::Array(size) => size * 64,
+        }
+    }
+}
+
+/// The serde representation of the enumset.
+#[derive(Copy, Clone)]
+enum SerdeRepr {
+    /// serde type: `u8`
+    U8,
+    /// serde type: `u16`
+    U16,
+    /// serde type: `u32`
+    U32,
+    /// serde type: `u64`
+    U64,
+    /// serde type: `u128`
+    U128,
+    /// serde type: list of `T`
+    List,
+    /// serde type: map of `T` to `bool`
+    Map,
+    /// serde type: list of `u64`
+    Array,
+}
+impl SerdeRepr {
+    /// Determines the number of variants supported by this repr.
+    fn supported_variants(&self) -> Option<usize> {
+        match self {
+            SerdeRepr::U8 => Some(8),
+            SerdeRepr::U16 => Some(16),
+            SerdeRepr::U32 => Some(32),
+            SerdeRepr::U64 => Some(64),
+            SerdeRepr::U128 => Some(128),
+            SerdeRepr::List => None,
+            SerdeRepr::Map => None,
+            SerdeRepr::Array => None,
+        }
+    }
+}
+
+/// An variant in the enum set type.
+struct EnumSetValue {
+    /// The name of the variant.
+    name: Ident,
+    /// The discriminant of the variant.
+    variant_repr: u32,
+}
+
+/// Stores information about the enum set type.
+#[allow(dead_code)]
+struct EnumSetInfo {
+    /// The name of the enum.
+    name: Ident,
+    /// The crate name to use.
+    crate_name: Option<Ident>,
+    /// The numeric type to represent the `EnumSet` as in memory.
+    explicit_internal_repr: Option<InternalRepr>,
+    /// Forces the internal numeric type of the `EnumSet` to be an array.
+    internal_repr_force_array: bool,
+    /// The numeric type to serialize the enum as.
+    explicit_serde_repr: Option<SerdeRepr>,
+    /// A list of variants in the enum.
+    variants: Vec<EnumSetValue>,
+
+    /// The highest encountered variant discriminant.
+    max_discrim: u32,
+    /// The span of the highest encountered variant.
+    max_discrim_span: Option<Span>,
+    /// The current variant discriminant. Used to track, e.g. `A=10,B,C`.
+    cur_discrim: u32,
+    /// A list of variant names that are already in use.
+    used_variant_names: HashSet<String>,
+    /// A list of variant discriminants that are already in use.
+    used_discriminants: HashSet<u32>,
+
+    /// Avoid generating operator overloads on the enum type.
+    no_ops: bool,
+    /// Avoid generating implementations for `Clone`, `Copy`, `Eq`, and `PartialEq`.
+    no_super_impls: bool,
+    /// Disallow unknown bits while deserializing the enum.
+    serialize_deny_unknown: bool,
+}
+impl EnumSetInfo {
+    fn new(input: &DeriveInput, attrs: &EnumsetAttrs) -> EnumSetInfo {
+        EnumSetInfo {
+            name: input.ident.clone(),
+            crate_name: attrs
+                .crate_name
+                .as_ref()
+                .map(|x| Ident::new(x, Span::call_site())),
+            explicit_internal_repr: None,
+            internal_repr_force_array: false,
+            explicit_serde_repr: None,
+            variants: Vec::new(),
+            max_discrim: 0,
+            max_discrim_span: None,
+            cur_discrim: 0,
+            used_variant_names: HashSet::new(),
+            used_discriminants: HashSet::new(),
+            no_ops: attrs.no_ops,
+            no_super_impls: attrs.no_super_impls,
+            serialize_deny_unknown: attrs.serialize_deny_unknown,
+        }
+    }
+
+    /// Explicits sets the serde representation of the enumset from a string.
+    fn push_serialize_repr(&mut self, span: Span, ty: &str) -> Result<()> {
+        match ty {
+            "u8" => self.explicit_serde_repr = Some(SerdeRepr::U8),
+            "u16" => self.explicit_serde_repr = Some(SerdeRepr::U16),
+            "u32" => self.explicit_serde_repr = Some(SerdeRepr::U32),
+            "u64" => self.explicit_serde_repr = Some(SerdeRepr::U64),
+            "u128" => self.explicit_serde_repr = Some(SerdeRepr::U128),
+            "list" => self.explicit_serde_repr = Some(SerdeRepr::List),
+            "map" => self.explicit_serde_repr = Some(SerdeRepr::Map),
+            "array" => self.explicit_serde_repr = Some(SerdeRepr::Array),
+            _ => error(span, format!("`{}` is not a valid serialized representation.", ty))?,
+        }
+        Ok(())
+    }
+
+    /// Explicitly sets the representation of the enumset from a string.
+    fn push_repr(&mut self, span: Span, ty: &str) -> Result<()> {
+        match ty {
+            "u8" => self.explicit_internal_repr = Some(InternalRepr::U8),
+            "u16" => self.explicit_internal_repr = Some(InternalRepr::U16),
+            "u32" => self.explicit_internal_repr = Some(InternalRepr::U32),
+            "u64" => self.explicit_internal_repr = Some(InternalRepr::U64),
+            "u128" => self.explicit_internal_repr = Some(InternalRepr::U128),
+            "array" => self.internal_repr_force_array = true,
+            _ => error(span, format!("`{}` is not a valid internal enumset representation.", ty))?,
+        }
+        Ok(())
+    }
+
+    /// Adds a variant to the enumset.
+    fn push_variant(&mut self, variant: &Variant) -> Result<()> {
+        if self.used_variant_names.contains(&variant.ident.to_string()) {
+            error(variant.span(), "Duplicated variant name.")
+        } else if let Fields::Unit = variant.fields {
+            // Parse the discriminant.
+            if let Some((_, expr)) = &variant.discriminant {
+                if let Expr::Lit(ExprLit { lit: Lit::Int(i), .. }) = expr {
+                    match i.base10_parse() {
+                        Ok(val) => self.cur_discrim = val,
+                        Err(_) => error(expr.span(), "Enum discriminants must fit into `u32`.")?,
+                    }
+                } else if let Expr::Unary(ExprUnary { op: UnOp::Neg(_), .. }) = expr {
+                    error(expr.span(), "Enum discriminants must not be negative.")?;
+                } else {
+                    error(variant.span(), "Enum discriminants must be literal expressions.")?;
+                }
+            }
+
+            // Validate the discriminant.
+            let discriminant = self.cur_discrim;
+            if discriminant >= 0xFFFFFFC0 {
+                error(variant.span(), "Maximum discriminant allowed is `0xFFFFFFBF`.")?;
+            }
+            if self.used_discriminants.contains(&discriminant) {
+                error(variant.span(), "Duplicated enum discriminant.")?;
+            }
+
+            // Add the variant to the info.
+            self.cur_discrim += 1;
+            if discriminant > self.max_discrim {
+                self.max_discrim = discriminant;
+                self.max_discrim_span = Some(variant.span());
+            }
+            self.variants
+                .push(EnumSetValue { name: variant.ident.clone(), variant_repr: discriminant });
+            self.used_variant_names.insert(variant.ident.to_string());
+            self.used_discriminants.insert(discriminant);
+
+            Ok(())
+        } else {
+            error(variant.span(), "`#[derive(EnumSetType)]` can only be used on fieldless enums.")
+        }
+    }
+
+    /// Returns the actual internal representation of the set.
+    fn internal_repr(&self) -> InternalRepr {
+        match self.explicit_internal_repr {
+            Some(x) => x,
+            None => match self.max_discrim {
+                x if x < 8 && !self.internal_repr_force_array => InternalRepr::U8,
+                x if x < 16 && !self.internal_repr_force_array => InternalRepr::U16,
+                x if x < 32 && !self.internal_repr_force_array => InternalRepr::U32,
+                x if x < 64 && !self.internal_repr_force_array => InternalRepr::U64,
+                x => InternalRepr::Array((x as usize + 64) / 64),
+            },
+        }
+    }
+
+    /// Returns the actual serde representation of the set.
+    fn serde_repr(&self) -> SerdeRepr {
+        match self.explicit_serde_repr {
+            Some(x) => x,
+            None => match self.max_discrim {
+                x if x < 8 => SerdeRepr::U8,
+                x if x < 16 => SerdeRepr::U16,
+                x if x < 32 => SerdeRepr::U32,
+                x if x < 64 => SerdeRepr::U64,
+                x if x < 128 => SerdeRepr::U128,
+                _ => SerdeRepr::Array,
+            },
+        }
+    }
+
+    /// Validate the enumset type.
+    fn validate(&self) -> Result<()> {
+        // Gets the span of the maximum value.
+        let largest_discriminant_span = match &self.max_discrim_span {
+            Some(x) => *x,
+            None => Span::call_site(),
+        };
+
+        // Check if all bits of the bitset can fit in the memory representation, if one was given.
+        if self.internal_repr().supported_variants() <= self.max_discrim as usize {
+            error(
+                largest_discriminant_span,
+                "`repr` is too small to contain the largest discriminant.",
+            )?;
+        }
+
+        // Check if all bits of the bitset can fit in the serialization representation.
+        if let Some(supported_variants) = self.serde_repr().supported_variants() {
+            if supported_variants <= self.max_discrim as usize {
+                error(
+                    largest_discriminant_span,
+                    "`serialize_repr` is too small to contain the largest discriminant.",
+                )?;
+            }
+        }
+
+        Ok(())
+    }
+
+    /// Returns a bitmask of all variants in the set.
+    fn variant_map(&self) -> Vec<u64> {
+        let mut vec = vec![0];
+        for variant in &self.variants {
+            let (idx, bit) = (variant.variant_repr as usize / 64, variant.variant_repr % 64);
+            while idx >= vec.len() {
+                vec.push(0);
+            }
+            vec[idx] |= 1u64 << bit;
+        }
+        vec
+    }
+}
+
+/// Generates the actual `EnumSetType` impl.
+fn enum_set_type_impl(info: EnumSetInfo, warnings: Vec<(Span, &'static str)>) -> SynTokenStream {
+    let name = &info.name;
+
+    let enumset = match &info.crate_name {
+        Some(crate_name) => quote!(::#crate_name),
+        None => {
+            #[cfg(feature = "proc-macro-crate")]
+            {
+                use proc_macro_crate::FoundCrate;
+
+                let crate_name = proc_macro_crate::crate_name("enumset");
+                match crate_name {
+                    Ok(FoundCrate::Name(name)) => {
+                        let ident = Ident::new(&name, Span::call_site());
+                        quote!(::#ident)
+                    }
+                    _ => quote!(::enumset),
+                }
+            }
+
+            #[cfg(not(feature = "proc-macro-crate"))]
+            {
+                quote!(::enumset)
+            }
+        }
+    };
+    let typed_enumset = quote!(#enumset::EnumSet<#name>);
+    let core = quote!(#enumset::__internal::core_export);
+    let internal = quote!(#enumset::__internal);
+    #[cfg(feature = "serde")]
+    let serde = quote!(#enumset::__internal::serde);
+
+    let repr = match info.internal_repr() {
+        InternalRepr::U8 => quote! { u8 },
+        InternalRepr::U16 => quote! { u16 },
+        InternalRepr::U32 => quote! { u32 },
+        InternalRepr::U64 => quote! { u64 },
+        InternalRepr::U128 => quote! { u128 },
+        InternalRepr::Array(size) => quote! { #internal::ArrayRepr<{ #size }> },
+    };
+    let variant_map = info.variant_map();
+    let all_variants = match info.internal_repr() {
+        InternalRepr::U8 | InternalRepr::U16 | InternalRepr::U32 | InternalRepr::U64 => {
+            let lit = Literal::u64_unsuffixed(variant_map[0]);
+            quote! { #lit }
+        }
+        InternalRepr::U128 => {
+            let lit = Literal::u128_unsuffixed(
+                variant_map[0] as u128 | variant_map.get(1).map_or(0, |x| (*x as u128) << 64),
+            );
+            quote! { #lit }
+        }
+        InternalRepr::Array(size) => {
+            let mut new = Vec::new();
+            for i in 0..size {
+                new.push(Literal::u64_unsuffixed(*variant_map.get(i).unwrap_or(&0)));
+            }
+            quote! { #internal::ArrayRepr::<{ #size }>([#(#new,)*]) }
+        }
+    };
+
+    let ops = if info.no_ops {
+        quote! {}
+    } else {
+        quote! {
+            #[automatically_derived]
+            impl<O: Into<#typed_enumset>> #core::ops::Sub<O> for #name {
+                type Output = #typed_enumset;
+                fn sub(self, other: O) -> Self::Output {
+                    #enumset::EnumSet::only(self) - other.into()
+                }
+            }
+            #[automatically_derived]
+            impl<O: Into<#typed_enumset>> #core::ops::BitAnd<O> for #name {
+                type Output = #typed_enumset;
+                fn bitand(self, other: O) -> Self::Output {
+                    #enumset::EnumSet::only(self) & other.into()
+                }
+            }
+            #[automatically_derived]
+            impl<O: Into<#typed_enumset>> #core::ops::BitOr<O> for #name {
+                type Output = #typed_enumset;
+                fn bitor(self, other: O) -> Self::Output {
+                    #enumset::EnumSet::only(self) | other.into()
+                }
+            }
+            #[automatically_derived]
+            impl<O: Into<#typed_enumset>> #core::ops::BitXor<O> for #name {
+                type Output = #typed_enumset;
+                fn bitxor(self, other: O) -> Self::Output {
+                    #enumset::EnumSet::only(self) ^ other.into()
+                }
+            }
+            #[automatically_derived]
+            impl #core::ops::Not for #name {
+                type Output = #typed_enumset;
+                fn not(self) -> Self::Output {
+                    !#enumset::EnumSet::only(self)
+                }
+            }
+            #[automatically_derived]
+            impl #core::cmp::PartialEq<#typed_enumset> for #name {
+                fn eq(&self, other: &#typed_enumset) -> bool {
+                    #enumset::EnumSet::only(*self) == *other
+                }
+            }
+        }
+    };
+
+    #[cfg(feature = "serde")]
+    let serde_repr = info.serde_repr();
+
+    #[cfg(feature = "serde")]
+    let serde_ops = match serde_repr {
+        SerdeRepr::U8 | SerdeRepr::U16 | SerdeRepr::U32 | SerdeRepr::U64 | SerdeRepr::U128 => {
+            let (serialize_repr, from_fn, to_fn) = match serde_repr {
+                SerdeRepr::U8 => (quote! { u8 }, quote! { from_u8 }, quote! { to_u8 }),
+                SerdeRepr::U16 => (quote! { u16 }, quote! { from_u16 }, quote! { to_u16 }),
+                SerdeRepr::U32 => (quote! { u32 }, quote! { from_u32 }, quote! { to_u32 }),
+                SerdeRepr::U64 => (quote! { u64 }, quote! { from_u64 }, quote! { to_u64 }),
+                SerdeRepr::U128 => (quote! { u128 }, quote! { from_u128 }, quote! { to_u128 }),
+                _ => unreachable!(),
+            };
+            let check_unknown = if info.serialize_deny_unknown {
+                quote! {
+                    if value & !#all_variants != 0 {
+                        use #serde::de::Error;
+                        return #core::prelude::v1::Err(
+                            D::Error::custom("enumset contains unknown bits")
+                        )
+                    }
+                }
+            } else {
+                quote! {}
+            };
+            quote! {
+                fn serialize<S: #serde::Serializer>(
+                    set: #enumset::EnumSet<#name>, ser: S,
+                ) -> #core::result::Result<S::Ok, S::Error> {
+                    let value =
+                        <#repr as #enumset::__internal::EnumSetTypeRepr>::#to_fn(&set.__priv_repr);
+                    #serde::Serialize::serialize(&value, ser)
+                }
+                fn deserialize<'de, D: #serde::Deserializer<'de>>(
+                    de: D,
+                ) -> #core::result::Result<#enumset::EnumSet<#name>, D::Error> {
+                    let value = <#serialize_repr as #serde::Deserialize>::deserialize(de)?;
+                    #check_unknown
+                    let value = <#repr as #enumset::__internal::EnumSetTypeRepr>::#from_fn(value);
+                    #core::prelude::v1::Ok(#enumset::EnumSet {
+                        __priv_repr: value & #all_variants,
+                    })
+                }
+            }
+        }
+        SerdeRepr::List => {
+            let expecting_str = format!("a list of {}", name);
+            quote! {
+                fn serialize<S: #serde::Serializer>(
+                    set: #enumset::EnumSet<#name>, ser: S,
+                ) -> #core::result::Result<S::Ok, S::Error> {
+                    use #serde::ser::SerializeSeq;
+                    let mut seq = ser.serialize_seq(#core::prelude::v1::Some(set.len()))?;
+                    for bit in set {
+                        seq.serialize_element(&bit)?;
+                    }
+                    seq.end()
+                }
+                fn deserialize<'de, D: #serde::Deserializer<'de>>(
+                    de: D,
+                ) -> #core::result::Result<#enumset::EnumSet<#name>, D::Error> {
+                    struct Visitor;
+                    impl <'de> #serde::de::Visitor<'de> for Visitor {
+                        type Value = #enumset::EnumSet<#name>;
+                        fn expecting(
+                            &self, formatter: &mut #core::fmt::Formatter,
+                        ) -> #core::fmt::Result {
+                            write!(formatter, #expecting_str)
+                        }
+                        fn visit_seq<A>(
+                            mut self, mut seq: A,
+                        ) -> #core::result::Result<Self::Value, A::Error> where
+                            A: #serde::de::SeqAccess<'de>
+                        {
+                            let mut accum = #enumset::EnumSet::<#name>::new();
+                            while let #core::prelude::v1::Some(val) = seq.next_element::<#name>()? {
+                                accum |= val;
+                            }
+                            #core::prelude::v1::Ok(accum)
+                        }
+                    }
+                    de.deserialize_seq(Visitor)
+                }
+            }
+        }
+        SerdeRepr::Map => {
+            let expecting_str = format!("a map from {} to bool", name);
+            quote! {
+                fn serialize<S: #serde::Serializer>(
+                    set: #enumset::EnumSet<#name>, ser: S,
+                ) -> #core::result::Result<S::Ok, S::Error> {
+                    use #serde::ser::SerializeMap;
+                    let mut map = ser.serialize_map(#core::prelude::v1::Some(set.len()))?;
+                    for bit in set {
+                        map.serialize_entry(&bit, &true)?;
+                    }
+                    map.end()
+                }
+                fn deserialize<'de, D: #serde::Deserializer<'de>>(
+                    de: D,
+                ) -> #core::result::Result<#enumset::EnumSet<#name>, D::Error> {
+                    struct Visitor;
+                    impl <'de> #serde::de::Visitor<'de> for Visitor {
+                        type Value = #enumset::EnumSet<#name>;
+                        fn expecting(
+                            &self, formatter: &mut #core::fmt::Formatter,
+                        ) -> #core::fmt::Result {
+                            write!(formatter, #expecting_str)
+                        }
+                        fn visit_map<A>(
+                            mut self, mut map: A,
+                        ) -> #core::result::Result<Self::Value, A::Error> where
+                            A: #serde::de::MapAccess<'de>
+                        {
+                            let mut accum = #enumset::EnumSet::<#name>::new();
+                            while let #core::prelude::v1::Some((val, is_present)) =
+                                map.next_entry::<#name, bool>()?
+                            {
+                                if is_present {
+                                    accum |= val;
+                                }
+                            }
+                            #core::prelude::v1::Ok(accum)
+                        }
+                    }
+                    de.deserialize_map(Visitor)
+                }
+            }
+        }
+        SerdeRepr::Array => {
+            let preferred_size = quote! {
+                <<#name as #internal::EnumSetTypePrivate>::Repr as #internal::EnumSetTypeRepr>
+                    ::PREFERRED_ARRAY_LEN
+            };
+            let (check_extra, convert_array) = if info.serialize_deny_unknown {
+                (
+                    quote! {
+                        if _val != 0 {
+                            return #core::prelude::v1::Err(
+                                D::Error::custom("enumset contains unknown bits")
+                            )
+                        }
+                    },
+                    quote! {
+                        match #enumset::EnumSet::<#name>::try_from_array(accum) {
+                            Some(x) => x,
+                            None => #core::prelude::v1::Err(
+                                D::Error::custom("enumset contains unknown bits")
+                            ),
+                        }
+                    },
+                )
+            } else {
+                (quote! {}, quote! {
+                    #core::prelude::v1::Ok(#enumset::EnumSet::<#name>::from_array(accum))
+                })
+            };
+            quote! {
+                fn serialize<S: #serde::Serializer>(
+                    set: #enumset::EnumSet<#name>, ser: S,
+                ) -> #core::result::Result<S::Ok, S::Error> {
+                    // read the enum as an array
+                    let array = set.as_array::<{ #preferred_size }>();
+
+                    // find the last non-zero value in the array
+                    let mut end = array.len();
+                    for i in (0..array.len()).rev() {
+                        if array[i] != 0 {
+                            break;
+                        }
+                        end = i + 1;
+                    }
+
+                    // serialize the array
+                    #serde::Serialize::serialize(&array[..end], ser)
+                }
+                fn deserialize<'de, D: #serde::Deserializer<'de>>(
+                    de: D,
+                ) -> #core::result::Result<#enumset::EnumSet<#name>, D::Error> {
+                    struct Visitor;
+                    impl <'de> #serde::de::Visitor<'de> for Visitor {
+                        type Value = #enumset::EnumSet<#name>;
+                        fn expecting(
+                            &self, formatter: &mut #core::fmt::Formatter,
+                        ) -> #core::fmt::Result {
+                            write!(formatter, "a list of u64")
+                        }
+                        fn visit_seq<A>(
+                            mut self, mut seq: A,
+                        ) -> #core::result::Result<Self::Value, A::Error> where
+                            A: #serde::de::SeqAccess<'de>
+                        {
+                            let mut accum = [0; #preferred_size];
+
+                            let mut i = 0;
+                            while let #core::prelude::v1::Some(val) = seq.next_element::<u64>()? {
+                                accum[i] = val;
+                                i += 1;
+
+                                if i == accum.len() {
+                                    break;
+                                }
+                            }
+                            while let #core::prelude::v1::Some(_val) = seq.next_element::<u64>()? {
+                                #check_extra
+                            }
+
+                            #convert_array
+                        }
+                    }
+                    de.deserialize_seq(Visitor)
+                }
+            }
+        }
+    };
+
+    #[cfg(not(feature = "serde"))]
+    let serde_ops = quote! {};
+
+    let is_uninhabited = info.variants.is_empty();
+    let is_zst = info.variants.len() == 1;
+    let into_impl = if is_uninhabited {
+        quote! {
+            fn enum_into_u32(self) -> u32 {
+                panic!(concat!(stringify!(#name), " is uninhabited."))
+            }
+            unsafe fn enum_from_u32(val: u32) -> Self {
+                panic!(concat!(stringify!(#name), " is uninhabited."))
+            }
+        }
+    } else if is_zst {
+        let variant = &info.variants[0].name;
+        quote! {
+            fn enum_into_u32(self) -> u32 {
+                self as u32
+            }
+            unsafe fn enum_from_u32(val: u32) -> Self {
+                #name::#variant
+            }
+        }
+    } else {
+        let variant_name: Vec<_> = info.variants.iter().map(|x| &x.name).collect();
+        let variant_value: Vec<_> = info.variants.iter().map(|x| x.variant_repr).collect();
+
+        let const_field: Vec<_> = ["IS_U8", "IS_U16", "IS_U32", "IS_U64", "IS_U128"]
+            .iter()
+            .map(|x| Ident::new(x, Span::call_site()))
+            .collect();
+        let int_type: Vec<_> = ["u8", "u16", "u32", "u64", "u128"]
+            .iter()
+            .map(|x| Ident::new(x, Span::call_site()))
+            .collect();
+
+        quote! {
+            fn enum_into_u32(self) -> u32 {
+                self as u32
+            }
+            unsafe fn enum_from_u32(val: u32) -> Self {
+                // We put these in const fields so the branches they guard aren't generated even
+                // on -O0
+                #(const #const_field: bool =
+                    #core::mem::size_of::<#name>() == #core::mem::size_of::<#int_type>();)*
+                match val {
+                    // Every valid variant value has an explicit branch. If they get optimized out,
+                    // great. If the representation has changed somehow, and they don't, oh well,
+                    // there's still no UB.
+                    #(#variant_value => #name::#variant_name,)*
+                    // Helps hint to the LLVM that this is a transmute. Note that this branch is
+                    // still unreachable.
+                    #(x if #const_field => {
+                        let x = x as #int_type;
+                        *(&x as *const _ as *const #name)
+                    })*
+                    // Default case. Sometimes causes LLVM to generate a table instead of a simple
+                    // transmute, but, oh well.
+                    _ => #core::hint::unreachable_unchecked(),
+                }
+            }
+        }
+    };
+
+    let eq_impl = if is_uninhabited {
+        quote!(panic!(concat!(stringify!(#name), " is uninhabited.")))
+    } else {
+        quote!((*self as u32) == (*other as u32))
+    };
+
+    let super_impls = if info.no_super_impls {
+        quote! {}
+    } else {
+        quote! {
+            #[automatically_derived]
+            impl #core::cmp::PartialEq for #name {
+                fn eq(&self, other: &Self) -> bool {
+                    #eq_impl
+                }
+            }
+            #[automatically_derived]
+            impl #core::cmp::Eq for #name { }
+            #[automatically_derived]
+            #[allow(clippy::expl_impl_clone_on_copy)]
+            impl #core::clone::Clone for #name {
+                fn clone(&self) -> Self {
+                    *self
+                }
+            }
+            #[automatically_derived]
+            impl #core::marker::Copy for #name { }
+        }
+    };
+
+    let impl_with_repr = if info.explicit_internal_repr.is_some() {
+        quote! {
+            #[automatically_derived]
+            unsafe impl #enumset::EnumSetTypeWithRepr for #name {
+                type Repr = #repr;
+            }
+        }
+    } else {
+        quote! {}
+    };
+
+    let inherent_impl_blocks = match info.internal_repr() {
+        InternalRepr::U8
+        | InternalRepr::U16
+        | InternalRepr::U32
+        | InternalRepr::U64
+        | InternalRepr::U128 => {
+            let self_as_repr_mask = if is_uninhabited {
+                quote! { 0 } // impossible anyway
+            } else {
+                quote! { 1 << self as #repr }
+            };
+
+            quote! {
+                #[automatically_derived]
+                #[doc(hidden)]
+                impl #name {
+                    /// Creates a new enumset with only this variant.
+                    #[deprecated(note = "This method is an internal implementation detail \
+                                         generated by the `enumset` crate's procedural macro. It \
+                                         should not be used directly.")]
+                    #[doc(hidden)]
+                    pub const fn __impl_enumset_internal__const_only(
+                        self,
+                    ) -> #enumset::EnumSet<#name> {
+                        #enumset::EnumSet { __priv_repr: #self_as_repr_mask }
+                    }
+
+                    /// Creates a new enumset with this variant added.
+                    #[deprecated(note = "This method is an internal implementation detail \
+                                         generated by the `enumset` crate's procedural macro. It \
+                                         should not be used directly.")]
+                    #[doc(hidden)]
+                    pub const fn __impl_enumset_internal__const_merge(
+                        self, chain: #enumset::EnumSet<#name>,
+                    ) -> #enumset::EnumSet<#name> {
+                        #enumset::EnumSet { __priv_repr: chain.__priv_repr | #self_as_repr_mask }
+                    }
+                }
+            }
+        }
+        InternalRepr::Array(size) => {
+            quote! {
+                #[automatically_derived]
+                #[doc(hidden)]
+                impl #name {
+                    /// Creates a new enumset with only this variant.
+                    #[deprecated(note = "This method is an internal implementation detail \
+                                         generated by the `enumset` crate's procedural macro. It \
+                                         should not be used directly.")]
+                    #[doc(hidden)]
+                    pub const fn __impl_enumset_internal__const_only(
+                        self,
+                    ) -> #enumset::EnumSet<#name> {
+                        let mut set = #enumset::EnumSet::<#name> {
+                            __priv_repr: #internal::ArrayRepr::<{ #size }>([0; #size]),
+                        };
+                        let bit = self as u32;
+                        let (idx, bit) = (bit as usize / 64, bit % 64);
+                        set.__priv_repr.0[idx] |= 1u64 << bit;
+                        set
+                    }
+
+                    /// Creates a new enumset with this variant added.
+                    #[deprecated(note = "This method is an internal implementation detail \
+                                         generated by the `enumset` crate's procedural macro. It \
+                                         should not be used directly.")]
+                    #[doc(hidden)]
+                    pub const fn __impl_enumset_internal__const_merge(
+                        self, mut chain: #enumset::EnumSet<#name>,
+                    ) -> #enumset::EnumSet<#name> {
+                        let bit = self as u32;
+                        let (idx, bit) = (bit as usize / 64, bit % 64);
+                        chain.__priv_repr.0[idx] |= 1u64 << bit;
+                        chain
+                    }
+                }
+            }
+        }
+    };
+
+    let mut generated_warnings = SynTokenStream::new();
+    for (span, warning) in warnings {
+        generated_warnings.extend(quote_spanned! {
+            span => {
+                #[deprecated(note = #warning)]
+                #[allow(non_upper_case_globals)]
+                const _w: () = ();
+                let _ = _w;
+            }
+        });
+    }
+
+    let bit_width = info.max_discrim + 1;
+    let variant_count = info.variants.len() as u32;
+    quote! {
+        #[automatically_derived]
+        unsafe impl #internal::EnumSetTypePrivate for #name {
+            type Repr = #repr;
+            const ALL_BITS: Self::Repr = #all_variants;
+            const BIT_WIDTH: u32 = #bit_width;
+            const VARIANT_COUNT: u32 = #variant_count;
+            #into_impl
+            #serde_ops
+        }
+
+        #[automatically_derived]
+        unsafe impl #enumset::EnumSetType for #name { }
+
+        #impl_with_repr
+        #super_impls
+        #inherent_impl_blocks
+
+        #ops
+
+        const _: () = {
+            fn __enumset_derive__generated_warnings() {
+                #generated_warnings
+            }
+        };
+    }
+}
+
+#[proc_macro_derive(EnumSetType, attributes(enumset))]
+pub fn derive_enum_set_type(input: TokenStream) -> TokenStream {
+    let input: DeriveInput = parse_macro_input!(input);
+    let attrs: EnumsetAttrs = match EnumsetAttrs::from_derive_input(&input) {
+        Ok(attrs) => attrs,
+        Err(e) => return e.write_errors().into(),
+    };
+    match derive_enum_set_type_0(input, attrs) {
+        Ok(v) => v,
+        Err(e) => e.to_compile_error().into(),
+    }
+}
+fn derive_enum_set_type_0(input: DeriveInput, attrs: EnumsetAttrs) -> Result<TokenStream> {
+    if !input.generics.params.is_empty() {
+        error(
+            input.generics.span(),
+            "`#[derive(EnumSetType)]` cannot be used on enums with type parameters.",
+        )
+    } else if let Data::Enum(data) = &input.data {
+        let mut info = EnumSetInfo::new(&input, &attrs);
+        let mut warnings = Vec::new();
+
+        // Check enum repr
+        for attr in &input.attrs {
+            if attr.path().is_ident("repr") {
+                let meta: Ident = attr.parse_args()?;
+                match meta.to_string().as_str() {
+                    "C" | "Rust" => {}
+                    "u8" | "u16" | "u32" | "u64" | "u128" | "usize" => {}
+                    "i8" | "i16" | "i32" | "i64" | "i128" | "isize" => {}
+                    x => error(
+                        attr.span(),
+                        format!("`#[repr({})]` cannot be used on enumset variants.", x),
+                    )?,
+                }
+            }
+        }
+
+        // Parse internal representations
+        if let Some(repr) = &*attrs.repr {
+            info.push_repr(attrs.repr.span(), repr)?;
+        }
+
+        // Parse serialization representations
+        if let Some(serialize_repr) = &*attrs.serialize_repr {
+            info.push_serialize_repr(attrs.serialize_repr.span(), serialize_repr)?;
+        }
+        if *attrs.serialize_as_map {
+            info.explicit_serde_repr = Some(SerdeRepr::Map);
+            warnings.push((
+                attrs.serialize_as_map.span(),
+                "#[enumset(serialize_as_map)] is deprecated. \
+                 Use `#[enumset(serialize_repr = \"map\")]` instead.",
+            ));
+        }
+        if *attrs.serialize_as_list {
+            // in old versions, serialize_as_list will override serialize_as_map
+            info.explicit_serde_repr = Some(SerdeRepr::List);
+            warnings.push((
+                attrs.serialize_as_list.span(),
+                "#[enumset(serialize_as_list)] is deprecated. \
+                 Use `#[enumset(serialize_repr = \"list\")]` instead.",
+            ));
+        }
+
+        // Parse enum variants
+        for variant in &data.variants {
+            info.push_variant(variant)?;
+        }
+
+        // Validate the enumset
+        info.validate()?;
+
+        // Generates the actual `EnumSetType` implementation
+        Ok(enum_set_type_impl(info, warnings).into())
+    } else {
+        error(input.span(), "`#[derive(EnumSetType)]` may only be used on enums")
+    }
+}