use smallvec::SmallVec;

use crate::{

};

#[derive(Debug, Clone, PartialEq, Eq)]

pub enum ParamKind {

Type,

Const(Ty),

}

ParamKind::Const(ty) => {

BoundVar::new(debruijn, idx).to_const(Interner, ty.clone()).cast(Interner)

}

});

this.vec.extend(filler.take(this.remaining()).casted(Interner));

assert_eq!(this.remaining(), 0);

let filler = this.param_kinds[this.vec.len()..].iter().map(|x| match x {

ParamKind::Type => TyKind::Error.intern(Interner).cast(Interner),

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

});

this.vec.extend(filler.casted(Interner));

assert_eq!(this.remaining(), 0);

self.fill(|x| match x {

ParamKind::Type => table.new_type_var().cast(Interner),

ParamKind::Const(ty) => table.new_const_var(ty.clone()).cast(Interner),

})

}

fn assert_match_kind(&self, a: &chalk_ir::GenericArg<Interner>, e: &ParamKind) {

match (a.data(Interner), e) {

(GenericArgData::Ty(_), ParamKind::Type)

_ => panic!("Mismatched kinds: {a:?}, {:?}, {:?}", self.vec, self.param_kinds),

}

}

) -> TyBuilder<()> {

let generics = generics(db.upcast(), def.into());

assert!(generics.parent_generics().is_some() == parent_subst.is_some());

let params = generics

.iter_self()

.map(|(id, data)| match data {

ParamKind::Const(db.const_param_ty(ConstParamId::from_unchecked(id)))

}

})

.collect();

TyBuilder::new((), params, parent_subst)

}

f.end_location_link();

if parameters.len(Interner) > 0 {

let generics = generics(db.upcast(), def.into());

// We print all params except implicit impl Trait params. Still a bit weird; should we leave out parent and self?

if total_len > 0 {

// `parameters` are in the order of fn's params (including impl traits),

// parent's params (those from enclosing impl or trait, if any).

let parameters = parameters.as_slice(Interner);

let fn_params = parameters.get(..fn_params_len);

let parent_params = parameters.get(parameters.len() - parent_params..);

let params = parent_params.into_iter().chain(fn_params).flatten();

ArithOp, Array, BinaryOp, ClosureKind, Expr, ExprId, LabelId, Literal, Statement, UnaryOp,

},

lang_item::{LangItem, LangItemTarget},

BlockId, ConstParamId, FieldId, ItemContainerId, Lookup, TupleFieldId, TupleId,

};

use hir_expand::name::{name, Name};

def_generics: Generics,

generic_args: Option<&GenericArgs>,

) -> Substitution {

assert_eq!(self_params, 0); // method shouldn't have another Self param

let mut substs = Vec::with_capacity(total_len);

// handle provided arguments

for (arg, kind_id) in generic_args

.args

.iter()

{

if let Some(g) = generic_arg_to_chalk(

self.db,

DebruijnIndex::INNERMOST,

)

},

) {

substs.push(g);

}

use crate::{

builder::ParamKind,

method_resolution::{self, VisibleFromModule},

to_chalk_trait_id,

utils::generics,

it.next().unwrap_or_else(|| match x {

ParamKind::Type => self.result.standard_types.unknown.clone().cast(Interner),

ParamKind::Const(ty) => consteval::unknown_const_as_generic(ty.clone()),

})

})

.build();

.fill(|it| {

let arg = match it {

ParamKind::Type => self.new_type_var(),

ParamKind::Const(_) => unreachable!("Tuple with const parameter"),

};

arg_tys.push(arg.clone());

};

pub use mapping::{

from_assoc_type_id, from_chalk_trait_id, from_foreign_def_id, from_placeholder_idx,

};

pub use method_resolution::check_orphan_rules;

pub use traits::TraitEnvironment;

ConstRef, LifetimeRef, TraitBoundModifier, TraitRef as HirTraitRef, TypeBound, TypeRef,

},

AdtId, AssocItemId, ConstId, ConstParamId, DefWithBodyId, EnumId, EnumVariantId, FunctionId,

};

use hir_expand::{name::Name, ExpandResult};

use intern::Interned;

list_params,

const_params,

_impl_trait_params,

) = if let Some(def) = self.resolver.generic_def() {

let generics = generics(self.db.upcast(), def);

generics.provenance_split()

} else {

};

TyKind::BoundVar(BoundVar::new(

self.in_binders,

))

.intern(Interner)

}

return Substitution::empty(Interner);

};

let def_generics = generics(self.db.upcast(), def);

let total_len = parent_params + item_len;

let ty_error = TyKind::Error.intern(Interner).cast(Interner);

let fill_self_params = || {

for x in explicit_self_ty

.take(self_params)

{

if let Some(id) = def_generic_iter.next() {

substs.push(x);

}

}

fill_self_params();

}

let expected_num = if generic_args.has_self_type {

} else {

type_params + const_params

};

let skip = if generic_args.has_self_type && self_params == 0 { 1 } else { 0 };

// if args are provided, it should be all of them, but we can't rely on that

if let Some(id) = def_generic_iter.next() {

if let Some(x) = generic_arg_to_chalk(

self.db,

&mut (),

|_, type_ref| self.lower_ty(type_ref),

|_, const_ref, ty| self.lower_const(const_ref, ty),

) {

had_explicit_args = true;

substs.push(x);

// These params include those of parent.

let remaining_params: SmallVec<[_; 2]> = def_generic_iter

})

.collect();

assert_eq!(remaining_params.len() + substs.len(), total_len);

let generic_params = generics(db.upcast(), def);

let parent_start_idx = generic_params.len_self();

match p {

TypeOrConstParamData::TypeParamData(p) => {

let mut ty =

make_binders(db, &generic_params, val)

}

}

defaults

}

/// Returns `Some` of the lowered generic arg. `None` if the provided arg is a lifetime.

pub(crate) fn generic_arg_to_chalk<'a, T>(

db: &dyn HirDatabase,

arg: &'a GenericArg,

this: &mut T,

for_type: impl FnOnce(&mut T, &TypeRef) -> Ty + 'a,

for_const: impl FnOnce(&mut T, &ConstRef, Ty) -> Const + 'a,

) -> Option<crate::GenericArg> {

let kind = match kind_id {

let ty = db.const_param_ty(id);

ParamKind::Const(ty)

}

};

Some(match (arg, kind) {

(GenericArg::Type(type_ref), ParamKind::Type) => for_type(this, type_ref).cast(Interner),

(GenericArg::Const(c), ParamKind::Const(c_ty)) => for_const(this, c, c_ty).cast(Interner),

(GenericArg::Const(_), ParamKind::Type) => TyKind::Error.intern(Interner).cast(Interner),

(GenericArg::Type(t), ParamKind::Const(c_ty)) => {

// We want to recover simple idents, which parser detects them

// as types. Maybe here is not the best place to do it, but

}

unknown_const_as_generic(c_ty)

}

})

}

db.lookup_intern_lifetime_param_id(interned_id)

}

let interned_id = db.intern_lifetime_param_id(id);

PlaceholderIndex {

ui: chalk_ir::UniverseIndex::ROOT,

}

/// (parent total, self param, type param list, const param list, impl trait)

let mut self_params = 0;

let mut type_params = 0;

let mut impl_trait_params = 0;

let mut const_params = 0;

self.params.iter().for_each(|(_, data)| match data {

TypeOrConstParamData::TypeParamData(p) => match p.provenance {

TypeParamProvenance::TypeParamList => type_params += 1,

TypeOrConstParamData::ConstParamData(_) => const_params += 1,

});

let parent_len = self.parent_generics().map_or(0, Generics::len);

}

pub(crate) fn param_idx(&self, param: TypeOrConstParamId) -> Option<usize> {

consteval::{try_const_usize, unknown_const_as_generic, ConstExt},

db::InternedClosure,

diagnostics::BodyValidationDiagnostic,

layout::{Layout as TyLayout, RustcEnumVariantIdx, RustcFieldIdx, TagEncoding},

method_resolution::{self, TyFingerprint},

mir::{interpret_mir, MutBorrowKind},

generics.next().unwrap_or_else(|| TyKind::Error.intern(Interner)).cast(Interner)

}

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

})

.build();

let ty = db.field_types(var_id)[self.id].clone().substitute(Interner, &substs);

match x {

ParamKind::Type => r.cast(Interner),

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

}

})

.build();

generics.next().unwrap_or_else(|| TyKind::Error.intern(Interner)).cast(Interner)

}

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

};

let parent_substs =

.unwrap_or_else(|| TyKind::Error.intern(Interner))

.cast(Interner),

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

})

.build()

});

generics.next().unwrap_or_else(|| TyKind::Error.intern(Interner)).cast(Interner)

}

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

};

let parent_substs = TyBuilder::subst_for_def(db, parent_id, None).fill(&mut filler).build();

// FIXME: this code is not covered in tests.

unknown_const_as_generic(ty.clone())

}

}

})

.build();

match it {

ParamKind::Type => args.next().unwrap().ty.clone().cast(Interner),

ParamKind::Const(ty) => unknown_const_as_generic(ty.clone()),

}

})

.build();