chore(frontend/exporter): drop some attribute support for now

We are probably not going to use most of attribute
kinds. After chatting with @Nadrieril, for easing
rustc updates, I'm dropping most of the attributes
kinds, hinding them behind a `Todo` variant.

Author: W95Psp

frontend/exporter/src/types/attributes.rs

@@ -13,142 +13,31 @@ pub enum AttributeKind {
         align: Align,
         span: Span,
     },
-    AllowConstFnUnstable(Vec<Symbol>, Span),
-    AllowIncoherentImpl(Span),
-    AllowInternalUnstable(Vec<(Symbol, Span)>, Span),
-    AsPtr(Span),
     AutomaticallyDerived(Span),
-    BodyStability {
-        stability: DefaultBodyStability,
-        span: Span,
-    },
-    CoherenceIsCore,
-    Coinductive(Span),
-    Cold(Span),
-    Confusables {
-        symbols: Vec<Symbol>,
-        first_span: Span,
-    },
-    ConstContinue(Span),
-    ConstStability {
-        stability: PartialConstStability,
-        span: Span,
-    },
-    ConstStabilityIndirect,
-    ConstTrait(Span),
     Coverage(Span, CoverageStatus),
-    DenyExplicitImpl(Span),
     Deprecation {
         deprecation: Deprecation,
         span: Span,
     },
-    DoNotImplementViaObject(Span),
     DocComment {
         style: AttrStyle,
         kind: CommentKind,
         span: Span,
         comment: Symbol,
     },
-    Dummy,
-    ExportName {
-        name: Symbol,
-        span: Span,
-    },
-    ExportStable,
-    FfiConst(Span),
-    FfiPure(Span),
-    Fundamental,
     Ignore {
         span: Span,
         reason: Option<Symbol>,
     },
-    Inline(InlineAttr, Span),
-    LinkName {
-        name: Symbol,
-        span: Span,
-    },
-    LinkOrdinal {
-        ordinal: u16,
-        span: Span,
-    },
-    LinkSection {
-        name: Symbol,
-        span: Span,
-    },
-    LoopMatch(Span),
-    MacroTransparency(Transparency),
     Marker(Span),
     MayDangle(Span),
     MustUse {
         span: Span,
         reason: Option<Symbol>,
     },
-    Naked(Span),
-    NoImplicitPrelude(Span),
-    NoMangle(Span),
-    NonExhaustive(Span),
-    OmitGdbPrettyPrinterSection,
-    Optimize(OptimizeAttr, Span),
-    ParenSugar(Span),
-    PassByValue(Span),
     Path(Symbol, Span),
-    Pointee(Span),
-    PubTransparent(Span),
-    Repr {
-        reprs: Vec<(ReprAttr, Span)>,
-        first_span: Span,
-    },
-    RustcLayoutScalarValidRangeEnd(u128, Span),
-    RustcLayoutScalarValidRangeStart(u128, Span),
-    RustcObjectLifetimeDefault,
-    SkipDuringMethodDispatch {
-        array: bool,
-        boxed_slice: bool,
-        span: Span,
-    },
-    SpecializationTrait(Span),
-    Stability {
-        stability: Stability,
-        span: Span,
-    },
-    StdInternalSymbol(Span),
-    TargetFeature(Vec<(Symbol, Span)>, Span),
-    TrackCaller(Span),
-    TypeConst(Span),
-    UnsafeSpecializationMarker(Span),
-    UnstableFeatureBound(Vec<(Symbol, Span)>),
-    Used {
-        used_by: UsedBy,
-        span: Span,
-    },
-}
-
-/// Reflects [`rustc_span::hygiene::Transparency`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_span::hygiene::Transparency, state: S as _s)]
-pub enum Transparency {
-    Transparent,
-    SemiOpaque,
-    Opaque,
-}
-
-/// Reflects [`rustc_attr_data_structures::Stability`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::Stability, state: S as _s)]
-pub struct Stability {
-    pub level: StabilityLevel,
-    pub feature: Symbol,
-}
-
-/// Reflects [`rustc_attr_data_structures::DefaultBodyStability`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::DefaultBodyStability, state: S as _s)]
-pub struct DefaultBodyStability {
-    pub level: StabilityLevel,
-    pub feature: Symbol,
+    #[todo]
+    Todo(String),
 }
 
 /// Reflects [`rustc_attr_data_structures::Deprecation`]
@@ -173,76 +62,6 @@ pub enum DeprecatedSince {
     Err,
 }
 
-/// Reflects [`rustc_attr_data_structures::ReprAttr`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::ReprAttr, state: S as _s)]
-pub enum ReprAttr {
-    ReprInt(IntType),
-    ReprRust,
-    ReprC,
-    ReprPacked(Align),
-    ReprSimd,
-    ReprTransparent,
-    ReprAlign(Align),
-}
-
-/// Reflects [`rustc_attr_data_structures::IntType`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::IntType, state: S as _s)]
-pub enum IntType {
-    SignedInt(IntTy),
-    UnsignedInt(UintTy),
-}
-
-/// Reflects [`rustc_attr_data_structures::UsedBy`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::UsedBy, state: S as _s)]
-pub enum UsedBy {
-    Compiler,
-    Linker,
-}
-
-/// Reflects [`rustc_attr_data_structures::StabilityLevel`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::StabilityLevel, state: S as _s)]
-pub enum StabilityLevel {
-    Unstable {
-        reason: UnstableReason,
-        #[map(x.map(|x| x.get()))]
-        issue: Option<u32>,
-        is_soft: bool,
-        implied_by: Option<Symbol>,
-        old_name: Option<Symbol>,
-    },
-    Stable {
-        since: StableSince,
-        allowed_through_unstable_modules: Option<Symbol>,
-    },
-}
-
-/// Reflects [`rustc_attr_data_structures::CoverageStatus`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::CoverageStatus, state: S as _s)]
-pub enum CoverageStatus {
-    On,
-    Off,
-}
-
-/// Reflects [`rustc_attr_data_structures::PartialConstStability`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::PartialConstStability, state: S as _s)]
-pub struct PartialConstStability {
-    pub level: StabilityLevel,
-    pub feature: Symbol,
-    pub promotable: bool,
-}
-
 /// Reflects [`rustc_attr_data_structures::RustcVersion`]
 #[derive_group(Serializers)]
 #[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
@@ -253,36 +72,13 @@ pub struct RustcVersion {
     pub patch: u16,
 }
 
-/// Reflects [`rustc_attr_data_structures::StableSince`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::StableSince, state: S as _s)]
-pub enum StableSince {
-    Version(RustcVersion),
-    Current,
-    #[custom_arm(rustc_attr_data_structures::StableSince::Err(_) => StableSince::Err,)]
-    Err,
-}
-
-/// Reflects [`rustc_attr_data_structures::UnstableReason`]
-#[derive_group(Serializers)]
-#[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::UnstableReason, state: S as _s)]
-pub enum UnstableReason {
-    None,
-    Default,
-    Some(Symbol),
-}
-
-/// Reflects [`rustc_attr_data_structures::OptimizeAttr`]
+/// Reflects [`rustc_attr_data_structures::CoverageStatus`]
 #[derive_group(Serializers)]
 #[derive(AdtInto, Clone, Debug, JsonSchema, Hash, PartialEq, Eq, PartialOrd, Ord)]
-#[args(<'tcx, S>, from: rustc_attr_data_structures::OptimizeAttr, state: S as _s)]
-pub enum OptimizeAttr {
-    Default,
-    DoNotOptimize,
-    Speed,
-    Size,
+#[args(<'tcx, S>, from: rustc_attr_data_structures::CoverageStatus, state: S as _s)]
+pub enum CoverageStatus {
+    On,
+    Off,
 }
 
 /// Reflects [`rustc_attr_data_structures::InlineAttr`]