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Merge #5993

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5993: Update chalk to 0.27 and add support for extern opaque types. r=crlf0710 a=crlf0710



Co-authored-by: Charles Lew <crlf0710@gmail.com>
This commit is contained in:
bors[bot] 2020-09-16 17:07:05 +00:00 committed by GitHub
commit 5df69d9034
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15 changed files with 166 additions and 44 deletions
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16
Cargo.lock generated
View File

@ -162,9 +162,9 @@ checksum = "4785bdd1c96b2a846b2bd7cc02e86b6b3dbf14e7e53446c4f54c92a361040822"
[[package]]
name = "chalk-derive"
version = "0.25.0"
version = "0.27.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "624e14d3f029186e6ffd97081ffa082f98ddd5df20655b6f0e8efb83dd8ac8b4"
checksum = "d5444ff2a211fe2a863e44d16a368c3d8a314d489de21b8eeb6879f14dd5d4a8"
dependencies = [
"proc-macro2",
"quote",
@ -174,9 +174,9 @@ dependencies = [
[[package]]
name = "chalk-ir"
version = "0.25.0"
version = "0.27.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "118c68eccdda5604af50bbef84c94550f3854f76989cb03c36ffd36cc2ffe958"
checksum = "e39c3db1dd4abfaa7658faaa62e5fe998a982a592b710bd971fad5b6adfcfdef"
dependencies = [
"chalk-derive",
"lazy_static",
@ -184,9 +184,9 @@ dependencies = [
[[package]]
name = "chalk-recursive"
version = "0.25.0"
version = "0.27.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "5130de3065e3cdfd2ab6d7d70b02b917bafbc096f270c9a643c23da249053606"
checksum = "3bfae328eff80ca54dcd0d731725bbb56136ac21c59261b68f1e5498e056b306"
dependencies = [
"chalk-derive",
"chalk-ir",
@ -197,9 +197,9 @@ dependencies = [
[[package]]
name = "chalk-solve"
version = "0.25.0"
version = "0.27.0"
source = "registry+https://github.com/rust-lang/crates.io-index"
checksum = "45b235a1f568b28707f117b2d30eabbee9cbcfccaa0d6e9697300400c8ca0996"
checksum = "a673abe3077adc25f8ee0894198aed494a5bb0ce50ee993900d0ee1a44e1948a"
dependencies = [
"chalk-derive",
"chalk-ir",

2
crates/hir_def/src/data.rs
View File

@ -54,6 +54,7 @@ pub struct TypeAliasData {
pub name: Name,
pub type_ref: Option<TypeRef>,
pub visibility: RawVisibility,
pub is_extern: bool,
/// Bounds restricting the type alias itself (eg. `type Ty: Bound;` in a trait or impl).
pub bounds: Vec<TypeBound>,
}
@ -71,6 +72,7 @@ pub(crate) fn type_alias_data_query(
name: typ.name.clone(),
type_ref: typ.type_ref.clone(),
visibility: item_tree[typ.visibility].clone(),
is_extern: typ.is_extern,
bounds: typ.bounds.to_vec(),
})
}

1
crates/hir_def/src/item_tree.rs
View File

@ -592,6 +592,7 @@ pub struct TypeAlias {
pub bounds: Box<[TypeBound]>,
pub generic_params: GenericParamsId,
pub type_ref: Option<TypeRef>,
pub is_extern: bool,
pub ast_id: FileAstId<ast::TypeAlias>,
}

6
crates/hir_def/src/item_tree/lower.rs
View File

@ -364,6 +364,7 @@ fn lower_type_alias(
generic_params,
type_ref,
ast_id,
is_extern: false,
};
Some(id(self.data().type_aliases.alloc(res)))
}
@ -558,8 +559,9 @@ fn lower_extern_block(&mut self, block: &ast::ExternBlock) -> Vec<ModItem> {
statik.into()
}
ast::ExternItem::TypeAlias(ty) => {
let id = self.lower_type_alias(&ty)?;
id.into()
let foreign_ty = self.lower_type_alias(&ty)?;
self.data().type_aliases[foreign_ty.index].is_extern = true;
foreign_ty.into()
}
ast::ExternItem::MacroCall(_) => return None,
};

2
crates/hir_def/src/item_tree/tests.rs
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@ -236,7 +236,7 @@ union Un {
#[Attrs { entries: Some([Attr { path: ModPath { kind: Plain, segments: [Name(Text("on_trait"))] }, input: None }]) }]
Trait { name: Name(Text("Tr")), visibility: RawVisibilityId("pub(self)"), generic_params: GenericParamsId(0), auto: false, items: [TypeAlias(Idx::<TypeAlias>(0)), Const(Idx::<Const>(0)), Function(Idx::<Function>(0)), Function(Idx::<Function>(1))], ast_id: FileAstId::<syntax::ast::generated::nodes::Trait>(2) }
> #[Attrs { entries: Some([Attr { path: ModPath { kind: Plain, segments: [Name(Text("assoc_ty"))] }, input: None }]) }]
> TypeAlias { name: Name(Text("AssocTy")), visibility: RawVisibilityId("pub(self)"), bounds: [Path(Path { type_anchor: None, mod_path: ModPath { kind: Plain, segments: [Name(Text("Tr"))] }, generic_args: [Some(GenericArgs { args: [Type(Tuple([]))], has_self_type: false, bindings: [] })] })], generic_params: GenericParamsId(4294967295), type_ref: None, ast_id: FileAstId::<syntax::ast::generated::nodes::TypeAlias>(8) }
> TypeAlias { name: Name(Text("AssocTy")), visibility: RawVisibilityId("pub(self)"), bounds: [Path(Path { type_anchor: None, mod_path: ModPath { kind: Plain, segments: [Name(Text("Tr"))] }, generic_args: [Some(GenericArgs { args: [Type(Tuple([]))], has_self_type: false, bindings: [] })] })], generic_params: GenericParamsId(4294967295), type_ref: None, is_extern: false, ast_id: FileAstId::<syntax::ast::generated::nodes::TypeAlias>(8) }
> #[Attrs { entries: Some([Attr { path: ModPath { kind: Plain, segments: [Name(Text("assoc_const"))] }, input: None }]) }]
> Const { name: Some(Name(Text("CONST"))), visibility: RawVisibilityId("pub(self)"), type_ref: Path(Path { type_anchor: None, mod_path: ModPath { kind: Plain, segments: [Name(Text("u8"))] }, generic_args: [None] }), ast_id: FileAstId::<syntax::ast::generated::nodes::Const>(9) }
> #[Attrs { entries: Some([Attr { path: ModPath { kind: Plain, segments: [Name(Text("assoc_method"))] }, input: None }]) }]

6
crates/hir_ty/Cargo.toml
View File

@ -17,9 +17,9 @@ ena = "0.14.0"
log = "0.4.8"
rustc-hash = "1.1.0"
scoped-tls = "1"
chalk-solve = { version = "0.25.0" }
chalk-ir = { version = "0.25.0" }
chalk-recursive = { version = "0.25.0" }
chalk-solve = { version = "0.27.0" }
chalk-ir = { version = "0.27.0" }
chalk-recursive = { version = "0.27.0" }
stdx = { path = "../stdx", version = "0.0.0" }
hir_def = { path = "../hir_def", version = "0.0.0" }

9
crates/hir_ty/src/display.rs
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@ -380,6 +380,15 @@ fn hir_fmt(&self, f: &mut HirFormatter) -> Result<(), HirDisplayError> {
write!(f, ">")?;
}
}
TypeCtor::ForeignType(type_alias) => {
let type_alias = f.db.type_alias_data(type_alias);
write!(f, "{}", type_alias.name)?;
if self.parameters.len() > 0 {
write!(f, "<")?;
f.write_joined(&*self.parameters.0, ", ")?;
write!(f, ">")?;
}
}
TypeCtor::OpaqueType(opaque_ty_id) => {
match opaque_ty_id {
OpaqueTyId::ReturnTypeImplTrait(func, idx) => {

11
crates/hir_ty/src/lib.rs
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@ -134,6 +134,9 @@ pub enum TypeCtor {
/// representing the Future::Output type.
OpaqueType(OpaqueTyId),
/// Represents a foreign type declared in external blocks.
ForeignType(TypeAliasId),
/// The type of a specific closure.
///
/// The closure signature is stored in a `FnPtr` type in the first type
@ -168,6 +171,10 @@ pub fn num_ty_params(self, db: &dyn HirDatabase) -> usize {
let generic_params = generics(db.upcast(), type_alias.into());
generic_params.len()
}
TypeCtor::ForeignType(type_alias) => {
let generic_params = generics(db.upcast(), type_alias.into());
generic_params.len()
}
TypeCtor::OpaqueType(opaque_ty_id) => {
match opaque_ty_id {
OpaqueTyId::ReturnTypeImplTrait(func, _) => {
@ -204,6 +211,9 @@ pub fn krate(self, db: &dyn HirDatabase) -> Option<CrateId> {
TypeCtor::AssociatedType(type_alias) => {
Some(type_alias.lookup(db.upcast()).module(db.upcast()).krate)
}
TypeCtor::ForeignType(type_alias) => {
Some(type_alias.lookup(db.upcast()).module(db.upcast()).krate)
}
TypeCtor::OpaqueType(opaque_ty_id) => match opaque_ty_id {
OpaqueTyId::ReturnTypeImplTrait(func, _) => {
Some(func.lookup(db.upcast()).module(db.upcast()).krate)
@ -231,6 +241,7 @@ pub fn as_generic_def(self) -> Option<GenericDefId> {
TypeCtor::Adt(adt) => Some(adt.into()),
TypeCtor::FnDef(callable) => Some(callable.into()),
TypeCtor::AssociatedType(type_alias) => Some(type_alias.into()),
TypeCtor::ForeignType(type_alias) => Some(type_alias.into()),
TypeCtor::OpaqueType(_impl_trait_id) => None,
}
}

6
crates/hir_ty/src/lower.rs
View File

@ -1101,10 +1101,14 @@ fn type_for_type_alias(db: &dyn HirDatabase, t: TypeAliasId) -> Binders<Ty> {
let resolver = t.resolver(db.upcast());
let ctx =
TyLoweringContext::new(db, &resolver).with_type_param_mode(TypeParamLoweringMode::Variable);
let type_ref = &db.type_alias_data(t).type_ref;
let substs = Substs::bound_vars(&generics, DebruijnIndex::INNERMOST);
if db.type_alias_data(t).is_extern {
Binders::new(substs.len(), Ty::apply(TypeCtor::ForeignType(t), substs))
} else {
let type_ref = &db.type_alias_data(t).type_ref;
let inner = Ty::from_hir(&ctx, type_ref.as_ref().unwrap_or(&TypeRef::Error));
Binders::new(substs.len(), inner)
}
}
#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]

8
crates/hir_ty/src/method_resolution.rs
View File

@ -250,6 +250,14 @@ macro_rules! lang_item_crate {
TypeCtor::Adt(def_id) => {
return Some(std::iter::once(def_id.module(db.upcast()).krate).collect())
}
TypeCtor::ForeignType(type_alias_id) => {
return Some(
std::iter::once(
type_alias_id.lookup(db.upcast()).module(db.upcast()).krate,
)
.collect(),
)
}
TypeCtor::Bool => lang_item_crate!("bool"),
TypeCtor::Char => lang_item_crate!("char"),
TypeCtor::Float(f) => match f.bitness {

36
crates/hir_ty/src/tests/method_resolution.rs
View File

@ -1051,3 +1051,39 @@ fn test(d: &dyn Trait) {
"#]],
);
}
#[test]
fn method_resolution_foreign_opaque_type() {
check_infer(
r#"
extern "C" {
type S;
fn f() -> &'static S;
}
impl S {
fn foo(&self) -> bool {
true
}
}
fn test() {
let s = unsafe { f() };
s.foo();
}
"#,
expect![[r#"
75..79 'self': &S
89..109 '{ ... }': bool
99..103 'true': bool
123..167 '{ ...o(); }': ()
133..134 's': &S
137..151 'unsafe { f() }': &S
144..151 '{ f() }': &S
146..147 'f': fn f() -> &S
146..149 'f()': &S
157..158 's': &S
157..164 's.foo()': bool
"#]],
);
}

16
crates/hir_ty/src/traits/chalk.rs
View File

@ -23,7 +23,8 @@
ProjectionTy, Substs, TraitRef, Ty, TypeCtor,
};
use mapping::{
convert_where_clauses, generic_predicate_to_inline_bound, make_binders, TypeAliasAsValue,
convert_where_clauses, generic_predicate_to_inline_bound, make_binders, TypeAliasAsAssocType,
TypeAliasAsValue,
};
pub use self::interner::*;
@ -340,7 +341,7 @@ pub(crate) fn associated_ty_data_query(
id: AssocTypeId,
) -> Arc<AssociatedTyDatum> {
debug!("associated_ty_data {:?}", id);
let type_alias: TypeAliasId = from_chalk(db, id);
let type_alias: TypeAliasId = from_chalk::<TypeAliasAsAssocType, _>(db, id).0;
let trait_ = match type_alias.lookup(db.upcast()).container {
AssocContainerId::TraitId(t) => t,
_ => panic!("associated type not in trait"),
@ -394,8 +395,10 @@ pub(crate) fn trait_datum_query(
fundamental: false,
};
let where_clauses = convert_where_clauses(db, trait_.into(), &bound_vars);
let associated_ty_ids =
trait_data.associated_types().map(|type_alias| type_alias.to_chalk(db)).collect();
let associated_ty_ids = trait_data
.associated_types()
.map(|type_alias| TypeAliasAsAssocType(type_alias).to_chalk(db))
.collect();
let trait_datum_bound = rust_ir::TraitDatumBound { where_clauses };
let well_known =
lang_attr(db.upcast(), trait_).and_then(|name| well_known_trait_from_lang_attr(&name));
@ -433,6 +436,7 @@ fn lang_attr_from_well_known_trait(attr: WellKnownTrait) -> &'static str {
WellKnownTrait::FnMut => "fn_mut",
WellKnownTrait::Fn => "fn",
WellKnownTrait::Unsize => "unsize",
WellKnownTrait::Unpin => "unpin",
}
}
@ -576,7 +580,7 @@ fn type_alias_associated_ty_value(
let value_bound = rust_ir::AssociatedTyValueBound { ty: ty.value.to_chalk(db) };
let value = rust_ir::AssociatedTyValue {
impl_id: impl_id.to_chalk(db),
associated_ty_id: assoc_ty.to_chalk(db),
associated_ty_id: TypeAliasAsAssocType(assoc_ty).to_chalk(db),
value: make_binders(value_bound, ty.num_binders),
};
Arc::new(value)
@ -611,9 +615,11 @@ pub(crate) fn fn_def_datum_query(
};
let datum = FnDefDatum {
id: fn_def_id,
sig: chalk_ir::FnSig {
abi: (),
safety: chalk_ir::Safety::Safe,
variadic: sig.value.is_varargs,
},
binders: make_binders(bound, sig.num_binders),
};
Arc::new(datum)

1
crates/hir_ty/src/traits/chalk/interner.rs
View File

@ -12,6 +12,7 @@
pub type AssocTypeId = chalk_ir::AssocTypeId<Interner>;
pub type AssociatedTyDatum = chalk_solve::rust_ir::AssociatedTyDatum<Interner>;
pub type ForeignDefId = chalk_ir::ForeignDefId<Interner>;
pub type TraitId = chalk_ir::TraitId<Interner>;
pub type TraitDatum = chalk_solve::rust_ir::TraitDatum<Interner>;
pub type AdtId = chalk_ir::AdtId<Interner>;

63
crates/hir_ty/src/traits/chalk/mapping.rs
View File

@ -34,9 +34,11 @@ fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Ty<Interner> {
let substitution = apply_ty.parameters.to_chalk(db).shifted_in(&Interner);
chalk_ir::TyData::Function(chalk_ir::FnPointer {
num_binders: 0,
sig: chalk_ir::FnSig {
abi: (),
safety: chalk_ir::Safety::Safe,
variadic: is_varargs,
},
substitution,
})
.intern(&Interner)
@ -48,7 +50,7 @@ fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::Ty<Interner> {
}
},
Ty::Projection(proj_ty) => {
let associated_ty_id = proj_ty.associated_ty.to_chalk(db);
let associated_ty_id = TypeAliasAsAssocType(proj_ty.associated_ty).to_chalk(db);
let substitution = proj_ty.parameters.to_chalk(db);
chalk_ir::AliasTy::Projection(chalk_ir::ProjectionTy {
associated_ty_id,
@ -114,7 +116,8 @@ fn from_chalk(db: &dyn HirDatabase, chalk: chalk_ir::Ty<Interner>) -> Self {
Ty::Placeholder(db.lookup_intern_type_param_id(interned_id))
}
chalk_ir::TyData::Alias(chalk_ir::AliasTy::Projection(proj)) => {
let associated_ty = from_chalk(db, proj.associated_ty_id);
let associated_ty =
from_chalk::<TypeAliasAsAssocType, _>(db, proj.associated_ty_id).0;
let parameters = from_chalk(db, proj.substitution);
Ty::Projection(ProjectionTy { associated_ty, parameters })
}
@ -125,7 +128,7 @@ fn from_chalk(db: &dyn HirDatabase, chalk: chalk_ir::Ty<Interner>) -> Self {
}
chalk_ir::TyData::Function(chalk_ir::FnPointer {
num_binders,
variadic,
sig: chalk_ir::FnSig { variadic, .. },
substitution,
..
}) => {
@ -290,8 +293,9 @@ impl ToChalk for TypeCtor {
fn to_chalk(self, db: &dyn HirDatabase) -> TypeName<Interner> {
match self {
TypeCtor::AssociatedType(type_alias) => {
let type_id = type_alias.to_chalk(db);
TypeName::AssociatedType(type_id)
let assoc_type = TypeAliasAsAssocType(type_alias);
let assoc_type_id = assoc_type.to_chalk(db);
TypeName::AssociatedType(assoc_type_id)
}
TypeCtor::OpaqueType(impl_trait_id) => {
@ -299,6 +303,12 @@ fn to_chalk(self, db: &dyn HirDatabase) -> TypeName<Interner> {
TypeName::OpaqueType(id)
}
TypeCtor::ForeignType(type_alias) => {
let foreign_type = TypeAliasAsForeignType(type_alias);
let foreign_type_id = foreign_type.to_chalk(db);
TypeName::Foreign(foreign_type_id)
}
TypeCtor::Bool => TypeName::Scalar(Scalar::Bool),
TypeCtor::Char => TypeName::Scalar(Scalar::Char),
TypeCtor::Int(int_ty) => TypeName::Scalar(int_ty_to_chalk(int_ty)),
@ -339,7 +349,9 @@ fn to_chalk(self, db: &dyn HirDatabase) -> TypeName<Interner> {
fn from_chalk(db: &dyn HirDatabase, type_name: TypeName<Interner>) -> TypeCtor {
match type_name {
TypeName::Adt(struct_id) => TypeCtor::Adt(struct_id.0),
TypeName::AssociatedType(type_id) => TypeCtor::AssociatedType(from_chalk(db, type_id)),
TypeName::AssociatedType(type_id) => {
TypeCtor::AssociatedType(from_chalk::<TypeAliasAsAssocType, _>(db, type_id).0)
}
TypeName::OpaqueType(opaque_type_id) => {
TypeCtor::OpaqueType(from_chalk(db, opaque_type_id))
}
@ -379,6 +391,10 @@ fn from_chalk(db: &dyn HirDatabase, type_name: TypeName<Interner>) -> TypeCtor {
TypeCtor::Closure { def, expr }
}
TypeName::Foreign(foreign_def_id) => {
TypeCtor::ForeignType(from_chalk::<TypeAliasAsForeignType, _>(db, foreign_def_id).0)
}
TypeName::Error => {
// this should not be reached, since we don't represent TypeName::Error with TypeCtor
unreachable!()
@ -488,15 +504,31 @@ fn from_chalk(db: &dyn HirDatabase, fn_def_id: FnDefId) -> CallableDefId {
}
}
impl ToChalk for TypeAliasId {
pub struct TypeAliasAsAssocType(pub TypeAliasId);
impl ToChalk for TypeAliasAsAssocType {
type Chalk = AssocTypeId;
fn to_chalk(self, _db: &dyn HirDatabase) -> AssocTypeId {
chalk_ir::AssocTypeId(self.as_intern_id())
chalk_ir::AssocTypeId(self.0.as_intern_id())
}
fn from_chalk(_db: &dyn HirDatabase, type_alias_id: AssocTypeId) -> TypeAliasId {
InternKey::from_intern_id(type_alias_id.0)
fn from_chalk(_db: &dyn HirDatabase, assoc_type_id: AssocTypeId) -> TypeAliasAsAssocType {
TypeAliasAsAssocType(InternKey::from_intern_id(assoc_type_id.0))
}
}
pub struct TypeAliasAsForeignType(pub TypeAliasId);
impl ToChalk for TypeAliasAsForeignType {
type Chalk = ForeignDefId;
fn to_chalk(self, _db: &dyn HirDatabase) -> ForeignDefId {
chalk_ir::ForeignDefId(self.0.as_intern_id())
}
fn from_chalk(_db: &dyn HirDatabase, foreign_def_id: ForeignDefId) -> TypeAliasAsForeignType {
TypeAliasAsForeignType(InternKey::from_intern_id(foreign_def_id.0))
}
}
@ -580,7 +612,7 @@ impl ToChalk for ProjectionTy {
fn to_chalk(self, db: &dyn HirDatabase) -> chalk_ir::ProjectionTy<Interner> {
chalk_ir::ProjectionTy {
associated_ty_id: self.associated_ty.to_chalk(db),
associated_ty_id: TypeAliasAsAssocType(self.associated_ty).to_chalk(db),
substitution: self.parameters.to_chalk(db),
}
}
@ -590,7 +622,11 @@ fn from_chalk(
projection_ty: chalk_ir::ProjectionTy<Interner>,
) -> ProjectionTy {
ProjectionTy {
associated_ty: from_chalk(db, projection_ty.associated_ty_id),
associated_ty: from_chalk::<TypeAliasAsAssocType, _>(
db,
projection_ty.associated_ty_id,
)
.0,
parameters: from_chalk(db, projection_ty.substitution),
}
}
@ -789,7 +825,8 @@ pub(super) fn generic_predicate_to_inline_bound(
let alias_eq_bound = rust_ir::AliasEqBound {
value: proj.ty.clone().to_chalk(db),
trait_bound: rust_ir::TraitBound { trait_id: trait_.to_chalk(db), args_no_self },
associated_ty_id: proj.projection_ty.associated_ty.to_chalk(db),
associated_ty_id: TypeAliasAsAssocType(proj.projection_ty.associated_ty)
.to_chalk(db),
parameters: Vec::new(), // FIXME we don't support generic associated types yet
};
Some(rust_ir::InlineBound::AliasEqBound(alias_eq_bound))

11
crates/hir_ty/src/traits/chalk/tls.rs
View File

@ -4,7 +4,7 @@
use chalk_ir::{AliasTy, GenericArg, Goal, Goals, Lifetime, ProgramClauseImplication, TypeName};
use itertools::Itertools;
use super::{from_chalk, Interner};
use super::{from_chalk, Interner, TypeAliasAsAssocType};
use crate::{db::HirDatabase, CallableDefId, TypeCtor};
use hir_def::{AdtId, AssocContainerId, DefWithBodyId, Lookup, TypeAliasId};
@ -77,6 +77,10 @@ pub fn debug_struct_id(
write!(f, "{{impl trait of async block {} of {:?}}}", idx.into_raw(), def)?;
}
},
TypeCtor::ForeignType(type_alias) => {
let name = self.0.type_alias_data(type_alias).name.clone();
write!(f, "{}", name)?;
}
TypeCtor::Closure { def, expr } => {
write!(f, "{{closure {:?} in ", expr.into_raw())?;
match def {
@ -119,7 +123,7 @@ pub fn debug_assoc_type_id(
id: super::AssocTypeId,
fmt: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let type_alias: TypeAliasId = from_chalk(self.0, id);
let type_alias: TypeAliasId = from_chalk::<TypeAliasAsAssocType, _>(self.0, id).0;
let type_alias_data = self.0.type_alias_data(type_alias);
let trait_ = match type_alias.lookup(self.0.upcast()).container {
AssocContainerId::TraitId(t) => t,
@ -153,7 +157,8 @@ pub fn debug_projection_ty(
projection_ty: &chalk_ir::ProjectionTy<Interner>,
fmt: &mut fmt::Formatter<'_>,
) -> Result<(), fmt::Error> {
let type_alias: TypeAliasId = from_chalk(self.0, projection_ty.associated_ty_id);
let type_alias: TypeAliasId =
from_chalk::<TypeAliasAsAssocType, _>(self.0, projection_ty.associated_ty_id).0;
let type_alias_data = self.0.type_alias_data(type_alias);
let trait_ = match type_alias.lookup(self.0.upcast()).container {
AssocContainerId::TraitId(t) => t,