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#![feature(associated_type_defaults)]
use std::cmp::Ord;
use std::fmt::{Debug, Formatter};
use std::hash::Hash;
use std::ops::ControlFlow;
pub trait Interner: Sized {
type DefId: Copy + Debug + Hash + Ord;
type AdtDef: Copy + Debug + Hash + Ord;
type GenericArgs: Copy
+ DebugWithInfcx<Self>
+ Hash
+ Ord
+ IntoIterator<Item = Self::GenericArg>;
type GenericArg: Copy + DebugWithInfcx<Self> + Hash + Ord;
type Term: Copy + Debug + Hash + Ord;
type Binder<T: TypeVisitable<Self>>: BoundVars<Self> + TypeSuperVisitable<Self>;
type BoundVars: IntoIterator<Item = Self::BoundVar>;
type BoundVar;
type CanonicalVars: Copy + Debug + Hash + Eq + IntoIterator<Item = CanonicalVarInfo<Self>>;
type Ty: Copy
+ DebugWithInfcx<Self>
+ Hash
+ Ord
+ Into<Self::GenericArg>
+ IntoKind<Kind = TyKind<Self>>
+ TypeSuperVisitable<Self>
+ Flags
+ Ty<Self>;
type Tys: Copy + Debug + Hash + Ord + IntoIterator<Item = Self::Ty>;
type AliasTy: Copy + DebugWithInfcx<Self> + Hash + Ord;
type ParamTy: Copy + Debug + Hash + Ord;
type BoundTy: Copy + Debug + Hash + Ord;
type PlaceholderTy: Copy + Debug + Hash + Ord + PlaceholderLike;
type ErrorGuaranteed: Copy + Debug + Hash + Ord;
type BoundExistentialPredicates: Copy + DebugWithInfcx<Self> + Hash + Ord;
type PolyFnSig: Copy + DebugWithInfcx<Self> + Hash + Ord;
type AllocId: Copy + Debug + Hash + Ord;
type Const: Copy
+ DebugWithInfcx<Self>
+ Hash
+ Ord
+ Into<Self::GenericArg>
+ IntoKind<Kind = ConstKind<Self>>
+ ConstTy<Self>
+ TypeSuperVisitable<Self>
+ Flags
+ Const<Self>;
type AliasConst: Copy + DebugWithInfcx<Self> + Hash + Ord;
type PlaceholderConst: Copy + Debug + Hash + Ord + PlaceholderLike;
type ParamConst: Copy + Debug + Hash + Ord;
type BoundConst: Copy + Debug + Hash + Ord;
type ValueConst: Copy + Debug + Hash + Ord;
type ExprConst: Copy + DebugWithInfcx<Self> + Hash + Ord;
type Region: Copy
+ DebugWithInfcx<Self>
+ Hash
+ Ord
+ Into<Self::GenericArg>
+ IntoKind<Kind = RegionKind<Self>>
+ Flags
+ Region<Self>;
type EarlyParamRegion: Copy + Debug + Hash + Ord;
type LateParamRegion: Copy + Debug + Hash + Ord;
type BoundRegion: Copy + Debug + Hash + Ord;
type InferRegion: Copy + DebugWithInfcx<Self> + Hash + Ord;
type PlaceholderRegion: Copy + Debug + Hash + Ord + PlaceholderLike;
type Predicate: Copy + Debug + Hash + Eq + TypeSuperVisitable<Self> + Flags;
type TraitPredicate: Copy + Debug + Hash + Eq;
type RegionOutlivesPredicate: Copy + Debug + Hash + Eq;
type TypeOutlivesPredicate: Copy + Debug + Hash + Eq;
type ProjectionPredicate: Copy + Debug + Hash + Eq;
type NormalizesTo: Copy + Debug + Hash + Eq;
type SubtypePredicate: Copy + Debug + Hash + Eq;
type CoercePredicate: Copy + Debug + Hash + Eq;
type ClosureKind: Copy + Debug + Hash + Eq;
// Required method
fn mk_canonical_var_infos(
self,
infos: &[CanonicalVarInfo<Self>]
) -> Self::CanonicalVars;
}
pub trait DebugWithInfcx<I: Interner>: Debug {
// Required method
fn fmt<Infcx: InferCtxtLike<Interner = I>>(
this: WithInfcx<'_, Infcx, &Self>,
f: &mut Formatter<'_>
) -> std::fmt::Result;
}
pub trait TypeVisitable<I: Interner>: Debug + Clone {
// Required method
fn visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> V::Result;
}
pub trait BoundVars<I: Interner> {
// Required methods
fn bound_vars(&self) -> I::BoundVars;
fn has_no_bound_vars(&self) -> bool;
}
pub trait TypeSuperVisitable<I: Interner>: TypeVisitable<I> {
// Required method
fn super_visit_with<V: TypeVisitor<I>>(&self, visitor: &mut V) -> V::Result;
}
pub struct CanonicalVarInfo<I: Interner> {
pub kind: CanonicalVarKind<I>,
}
pub struct CanonicalVarKind<I>(std::marker::PhantomData<I>);
pub struct TyKind<I>(std::marker::PhantomData<I>);
pub trait IntoKind {
type Kind;
// Required method
fn kind(self) -> Self::Kind;
}
pub trait Flags {
// Required methods
fn flags(&self) -> TypeFlags;
fn outer_exclusive_binder(&self) -> DebruijnIndex;
}
pub struct TypeFlags;
pub trait Ty<I: Interner<Ty = Self>> {
// Required method
fn new_anon_bound(
interner: I,
debruijn: DebruijnIndex,
var: BoundVar
) -> Self;
}
pub trait PlaceholderLike {
// Required methods
fn universe(self) -> UniverseIndex;
fn var(self) -> BoundVar;
fn with_updated_universe(self, ui: UniverseIndex) -> Self;
fn new(ui: UniverseIndex, var: BoundVar) -> Self;
}
pub struct UniverseIndex;
pub struct BoundVar;
pub struct ConstKind<I>(std::marker::PhantomData<I>);
pub trait Const<I: Interner<Const = Self>> {
// Required method
fn new_anon_bound(
interner: I,
debruijn: DebruijnIndex,
var: BoundVar,
ty: I::Ty
) -> Self;
}
pub trait ConstTy<I: Interner> {
// Required method
fn ty(self) -> I::Ty;
}
pub struct DebruijnIndex;
pub struct RegionKind<I>(std::marker::PhantomData<I>);
pub trait Region<I: Interner<Region = Self>> {
// Required method
fn new_anon_bound(
interner: I,
debruijn: DebruijnIndex,
var: BoundVar
) -> Self;
}
pub trait TypeVisitor<I: Interner>: Sized {
type Result: VisitorResult = ();
// Provided methods
fn visit_binder<T: TypeVisitable<I>>(
&mut self,
t: &I::Binder<T>
) -> Self::Result { unimplemented!() }
fn visit_ty(&mut self, t: I::Ty) -> Self::Result { unimplemented!() }
fn visit_region(&mut self, _r: I::Region) -> Self::Result { unimplemented!() }
fn visit_const(&mut self, c: I::Const) -> Self::Result { unimplemented!() }
fn visit_predicate(&mut self, p: I::Predicate) -> Self::Result { unimplemented!() }
}
pub trait VisitorResult {
type Residual;
// Required methods
fn output() -> Self;
fn from_residual(residual: Self::Residual) -> Self;
fn from_branch(b: ControlFlow<Self::Residual>) -> Self;
fn branch(self) -> ControlFlow<Self::Residual>;
}
impl VisitorResult for () {
type Residual = ();
fn output() -> Self {}
fn from_residual(_: Self::Residual) -> Self {}
fn from_branch(_: ControlFlow<Self::Residual>) -> Self {}
fn branch(self) -> ControlFlow<Self::Residual> { ControlFlow::Continue(()) }
}
pub struct WithInfcx<'a, Infcx: InferCtxtLike, T> {
pub data: T,
pub infcx: &'a Infcx,
}
pub trait InferCtxtLike {
type Interner: Interner;
// Required methods
fn interner(&self) -> Self::Interner;
fn universe_of_ty(&self, ty: TyVid) -> Option<UniverseIndex>;
fn root_ty_var(&self, vid: TyVid) -> TyVid;
fn probe_ty_var(
&self,
vid: TyVid
) -> Option<<Self::Interner as Interner>::Ty>;
fn universe_of_lt(
&self,
lt: <Self::Interner as Interner>::InferRegion
) -> Option<UniverseIndex>;
fn opportunistic_resolve_lt_var(
&self,
vid: <Self::Interner as Interner>::InferRegion
) -> Option<<Self::Interner as Interner>::Region>;
fn universe_of_ct(&self, ct: ConstVid) -> Option<UniverseIndex>;
fn root_ct_var(&self, vid: ConstVid) -> ConstVid;
fn probe_ct_var(
&self,
vid: ConstVid
) -> Option<<Self::Interner as Interner>::Const>;
}
pub struct TyVid;
pub struct ConstVid;
|
