6 files changed, 68 insertions, 68 deletions

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 9578c20b0..7b5d78543 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -741,7 +741,7 @@ impl Trait {
     }
 
     pub fn trait_ref(self, db: &impl HirDatabase) -> TraitRef {
-        TraitRef::for_trait(db, self)
+        TraitRef::for_trait(db, self.id)
     }
 
     pub fn is_auto(self, db: &impl DefDatabase) -> bool {
diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index 2a2dc26b4..3711068fa 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -26,7 +26,7 @@ use ra_db::{impl_intern_key, salsa};
 
 use crate::{
     db::HirDatabase, expr::ExprId, util::make_mut_slice, Adt, Crate, FloatTy, IntTy, Mutability,
-    Name, Trait, Uncertain,
+    Name, Uncertain,
 };
 use display::{HirDisplay, HirFormatter};
 
@@ -445,7 +445,7 @@ impl Deref for Substs {
 #[derive(Clone, PartialEq, Eq, Debug, Hash)]
 pub struct TraitRef {
     /// FIXME name?
-    pub trait_: Trait,
+    pub trait_: TraitId,
     pub substs: Substs,
 }
 
@@ -676,7 +676,7 @@ impl Ty {
     }
 
     /// If this is an `impl Trait` or `dyn Trait`, returns that trait.
-    pub fn inherent_trait(&self) -> Option<Trait> {
+    pub fn inherent_trait(&self) -> Option<TraitId> {
         match self {
             Ty::Dyn(predicates) | Ty::Opaque(predicates) => {
                 predicates.iter().find_map(|pred| match pred {
@@ -988,7 +988,10 @@ impl HirDisplay for Ty {
                             write!(
                                 f,
                                 "{}",
-                                trait_ref.trait_.name(f.db).unwrap_or_else(Name::missing)
+                                f.db.trait_data(trait_ref.trait_)
+                                    .name
+                                    .clone()
+                                    .unwrap_or_else(Name::missing)
                             )?;
                             if trait_ref.substs.len() > 1 {
                                 write!(f, "<")?;
@@ -1049,7 +1052,7 @@ impl TraitRef {
         } else {
             write!(f, ": ")?;
         }
-        write!(f, "{}", self.trait_.name(f.db).unwrap_or_else(Name::missing))?;
+        write!(f, "{}", f.db.trait_data(self.trait_).name.clone().unwrap_or_else(Name::missing))?;
         if self.substs.len() > 1 {
             write!(f, "<")?;
             f.write_joined(&self.substs[1..], ", ")?;
diff --git a/crates/ra_hir/src/ty/infer/path.rs b/crates/ra_hir/src/ty/infer/path.rs
index 6165eba4f..202fff4f3 100644
--- a/crates/ra_hir/src/ty/infer/path.rs
+++ b/crates/ra_hir/src/ty/infer/path.rs
@@ -143,24 +143,27 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         id: ExprOrPatId,
     ) -> Option<(ValueNs, Option<Substs>)> {
         let trait_ = trait_ref.trait_;
-        let item = trait_.items(self.db).iter().copied().find_map(|item| match item {
-            AssocItem::Function(func) => {
-                if segment.name == func.name(self.db) {
-                    Some(AssocItem::Function(func))
-                } else {
-                    None
-                }
-            }
+        let item =
+            self.db.trait_data(trait_).items.iter().map(|(_name, id)| (*id).into()).find_map(
+                |item| match item {
+                    AssocItem::Function(func) => {
+                        if segment.name == func.name(self.db) {
+                            Some(AssocItem::Function(func))
+                        } else {
+                            None
+                        }
+                    }
 
-            AssocItem::Const(konst) => {
-                if konst.name(self.db).map_or(false, |n| n == segment.name) {
-                    Some(AssocItem::Const(konst))
-                } else {
-                    None
-                }
-            }
-            AssocItem::TypeAlias(_) => None,
-        })?;
+                    AssocItem::Const(konst) => {
+                        if konst.name(self.db).map_or(false, |n| n == segment.name) {
+                            Some(AssocItem::Const(konst))
+                        } else {
+                            None
+                        }
+                    }
+                    AssocItem::TypeAlias(_) => None,
+                },
+            )?;
         let def = match item {
             AssocItem::Function(f) => ValueNs::FunctionId(f.id),
             AssocItem::Const(c) => ValueNs::ConstId(c.id),
@@ -212,7 +215,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                             .fill_with_params()
                             .build();
                         self.obligations.push(super::Obligation::Trait(TraitRef {
-                            trait_: t,
+                            trait_: t.id,
                             substs: trait_substs,
                         }));
                         Some(substs)
diff --git a/crates/ra_hir/src/ty/lower.rs b/crates/ra_hir/src/ty/lower.rs
index 805a73ff5..a7149614d 100644
--- a/crates/ra_hir/src/ty/lower.rs
+++ b/crates/ra_hir/src/ty/lower.rs
@@ -15,7 +15,7 @@ use hir_def::{
     resolver::{HasResolver, Resolver, TypeNs},
     type_ref::{TypeBound, TypeRef},
     AdtId, AstItemDef, EnumVariantId, FunctionId, GenericDefId, HasModule, LocalStructFieldId,
-    Lookup, StructId, VariantId,
+    Lookup, StructId, TraitId, VariantId,
 };
 use ra_arena::map::ArenaMap;
 use ra_db::CrateId;
@@ -172,7 +172,7 @@ impl Ty {
                     let segment = &remaining_segments[0];
                     let associated_ty = associated_type_by_name_including_super_traits(
                         db,
-                        trait_ref.trait_.id,
+                        trait_ref.trait_,
                         &segment.name,
                     );
                     match associated_ty {
@@ -263,7 +263,7 @@ impl Ty {
             GenericPredicate::Implemented(tr) if tr.self_ty() == &self_ty => Some(tr.trait_),
             _ => None,
         });
-        let traits = traits_from_env.flat_map(|t| all_super_traits(db, t.id)).map(Trait::from);
+        let traits = traits_from_env.flat_map(|t| all_super_traits(db, t)).map(Trait::from);
         for t in traits {
             if let Some(associated_ty) = db.trait_data(t.id).associated_type_by_name(&segment.name)
             {
@@ -423,7 +423,7 @@ impl TraitRef {
         if let Some(self_ty) = explicit_self_ty {
             make_mut_slice(&mut substs.0)[0] = self_ty;
         }
-        TraitRef { trait_: resolved, substs }
+        TraitRef { trait_: resolved.id, substs }
     }
 
     pub(crate) fn from_hir(
@@ -450,8 +450,8 @@ impl TraitRef {
         substs_from_path_segment(db, resolver, segment, Some(resolved.id.into()), !has_self_param)
     }
 
-    pub(crate) fn for_trait(db: &impl HirDatabase, trait_: Trait) -> TraitRef {
-        let substs = Substs::identity(&db.generic_params(trait_.id.into()));
+    pub(crate) fn for_trait(db: &impl HirDatabase, trait_: TraitId) -> TraitRef {
+        let substs = Substs::identity(&db.generic_params(trait_.into()));
         TraitRef { trait_, substs }
     }
 
@@ -510,7 +510,7 @@ fn assoc_type_bindings_from_type_bound<'a>(
         .flat_map(|args_and_bindings| args_and_bindings.bindings.iter())
         .map(move |(name, type_ref)| {
             let associated_ty =
-                associated_type_by_name_including_super_traits(db, trait_ref.trait_.id, &name);
+                associated_type_by_name_including_super_traits(db, trait_ref.trait_, &name);
             let associated_ty = match associated_ty {
                 None => return GenericPredicate::Error,
                 Some(t) => t,
diff --git a/crates/ra_hir/src/ty/method_resolution.rs b/crates/ra_hir/src/ty/method_resolution.rs
index 9988570e8..f1bc638ee 100644
--- a/crates/ra_hir/src/ty/method_resolution.rs
+++ b/crates/ra_hir/src/ty/method_resolution.rs
@@ -68,7 +68,7 @@ impl CrateImplBlocks {
                         if let Some(tr) =
                             TraitRef::from_hir(db, &resolver, &trait_ref, Some(target_ty))
                         {
-                            res.impls_by_trait.entry(tr.trait_.id).or_default().push(impl_id);
+                            res.impls_by_trait.entry(tr.trait_).or_default().push(impl_id);
                         }
                     }
                     None => {
@@ -249,13 +249,11 @@ fn iterate_trait_method_candidates<T>(
     let traits_from_env = env
         .trait_predicates_for_self_ty(&ty.value)
         .map(|tr| tr.trait_)
-        .flat_map(|t| all_super_traits(db, t.id))
-        .map(Trait::from);
-    let traits = inherent_trait
-        .chain(traits_from_env)
-        .chain(resolver.traits_in_scope(db).into_iter().map(Trait::from));
+        .flat_map(|t| all_super_traits(db, t));
+    let traits =
+        inherent_trait.chain(traits_from_env).chain(resolver.traits_in_scope(db).into_iter());
     'traits: for t in traits {
-        let data = db.trait_data(t.id);
+        let data = db.trait_data(t);
 
         // we'll be lazy about checking whether the type implements the
         // trait, but if we find out it doesn't, we'll skip the rest of the
@@ -330,7 +328,7 @@ pub(crate) fn implements_trait(
     db: &impl HirDatabase,
     resolver: &Resolver,
     krate: Crate,
-    trait_: Trait,
+    trait_: TraitId,
 ) -> bool {
     if ty.value.inherent_trait() == Some(trait_) {
         // FIXME this is a bit of a hack, since Chalk should say the same thing
@@ -373,11 +371,11 @@ impl Ty {
 fn generic_implements_goal(
     db: &impl HirDatabase,
     env: Arc<TraitEnvironment>,
-    trait_: Trait,
+    trait_: TraitId,
     self_ty: Canonical<Ty>,
 ) -> Canonical<InEnvironment<super::Obligation>> {
     let num_vars = self_ty.num_vars;
-    let substs = super::Substs::build_for_def(db, trait_.id)
+    let substs = super::Substs::build_for_def(db, trait_)
         .push(self_ty.value)
         .fill_with_bound_vars(num_vars as u32)
         .build();
diff --git a/crates/ra_hir/src/ty/traits/chalk.rs b/crates/ra_hir/src/ty/traits/chalk.rs
index 78f4b3e27..02d37dead 100644
--- a/crates/ra_hir/src/ty/traits/chalk.rs
+++ b/crates/ra_hir/src/ty/traits/chalk.rs
@@ -9,7 +9,9 @@ use chalk_ir::{
 };
 use chalk_rust_ir::{AssociatedTyDatum, AssociatedTyValue, ImplDatum, StructDatum, TraitDatum};
 
-use hir_def::{lang_item::LangItemTarget, ContainerId, GenericDefId, Lookup, TraitId, TypeAliasId};
+use hir_def::{
+    lang_item::LangItemTarget, AstItemDef, ContainerId, GenericDefId, Lookup, TraitId, TypeAliasId,
+};
 use hir_expand::name;
 
 use ra_db::salsa::{InternId, InternKey};
@@ -19,7 +21,7 @@ use crate::{
     db::HirDatabase,
     ty::display::HirDisplay,
     ty::{ApplicationTy, GenericPredicate, ProjectionTy, Substs, TraitRef, Ty, TypeCtor, TypeWalk},
-    Crate, ImplBlock, Trait, TypeAlias,
+    Crate, ImplBlock, TypeAlias,
 };
 
 /// This represents a trait whose name we could not resolve.
@@ -167,15 +169,15 @@ impl ToChalk for TraitRef {
     }
 }
 
-impl ToChalk for Trait {
+impl ToChalk for TraitId {
     type Chalk = chalk_ir::TraitId;
 
     fn to_chalk(self, _db: &impl HirDatabase) -> chalk_ir::TraitId {
-        chalk_ir::TraitId(id_to_chalk(self.id))
+        chalk_ir::TraitId(id_to_chalk(self))
     }
 
-    fn from_chalk(_db: &impl HirDatabase, trait_id: chalk_ir::TraitId) -> Trait {
-        Trait { id: id_from_chalk(trait_id.0) }
+    fn from_chalk(_db: &impl HirDatabase, trait_id: chalk_ir::TraitId) -> TraitId {
+        id_from_chalk(trait_id.0)
     }
 }
 
@@ -443,10 +445,10 @@ where
         if trait_id == UNKNOWN_TRAIT {
             return Vec::new();
         }
-        let trait_: Trait = from_chalk(self.db, trait_id);
+        let trait_: TraitId = from_chalk(self.db, trait_id);
         let mut result: Vec<_> = self
             .db
-            .impls_for_trait(self.krate, trait_)
+            .impls_for_trait(self.krate, trait_.into())
             .iter()
             .copied()
             .map(Impl::ImplBlock)
@@ -459,7 +461,7 @@ where
                 [super::FnTrait::FnOnce, super::FnTrait::FnMut, super::FnTrait::Fn].iter()
             {
                 if let Some(actual_trait) = get_fn_trait(self.db, self.krate, fn_trait) {
-                    if trait_.id == actual_trait {
+                    if trait_ == actual_trait {
                         let impl_ = super::ClosureFnTraitImplData { def, expr, fn_trait };
                         result.push(Impl::ClosureFnTraitImpl(impl_).to_chalk(self.db));
                     }
@@ -516,7 +518,7 @@ pub(crate) fn associated_ty_data_query(
         where_clauses: vec![],
     };
     let datum = AssociatedTyDatum {
-        trait_id: Trait::from(trait_).to_chalk(db),
+        trait_id: trait_.to_chalk(db),
         id,
         name: lalrpop_intern::intern(&db.type_alias_data(type_alias).name.to_string()),
         binders: make_binders(bound_data, generic_params.count_params_including_parent()),
@@ -548,29 +550,23 @@ pub(crate) fn trait_datum_query(
             associated_ty_ids: vec![],
         });
     }
-    let trait_: Trait = from_chalk(db, trait_id);
-    debug!("trait {:?} = {:?}", trait_id, trait_.name(db));
-    let generic_params = db.generic_params(trait_.id.into());
+    let trait_: TraitId = from_chalk(db, trait_id);
+    let trait_data = db.trait_data(trait_);
+    debug!("trait {:?} = {:?}", trait_id, trait_data.name);
+    let generic_params = db.generic_params(trait_.into());
     let bound_vars = Substs::bound_vars(&generic_params);
     let flags = chalk_rust_ir::TraitFlags {
-        auto: trait_.is_auto(db),
-        upstream: trait_.module(db).krate() != krate,
+        auto: trait_data.auto,
+        upstream: trait_.module(db).krate != krate.crate_id,
         non_enumerable: true,
         coinductive: false, // only relevant for Chalk testing
         // FIXME set these flags correctly
         marker: false,
         fundamental: false,
     };
-    let where_clauses = convert_where_clauses(db, trait_.id.into(), &bound_vars);
-    let associated_ty_ids = trait_
-        .items(db)
-        .into_iter()
-        .filter_map(|trait_item| match trait_item {
-            crate::AssocItem::TypeAlias(type_alias) => Some(type_alias.id),
-            _ => None,
-        })
-        .map(|type_alias| type_alias.to_chalk(db))
-        .collect();
+    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 trait_datum_bound = chalk_rust_ir::TraitDatumBound { where_clauses };
     let trait_datum = TraitDatum {
         id: trait_id,
@@ -661,7 +657,7 @@ fn impl_block_datum(
     };
 
     let impl_datum_bound = chalk_rust_ir::ImplDatumBound { trait_ref, where_clauses };
-    let trait_data = db.trait_data(trait_.id);
+    let trait_data = db.trait_data(trait_);
     let associated_ty_value_ids = impl_block
         .items(db)
         .into_iter()
@@ -785,7 +781,7 @@ fn type_alias_associated_ty_value(
         .expect("assoc ty value should not exist") // we don't return any assoc ty values if the impl'd trait can't be resolved
         .trait_;
     let assoc_ty = db
-        .trait_data(trait_.id)
+        .trait_data(trait_)
         .associated_type_by_name(&type_alias.name(db))
         .expect("assoc ty value should not exist"); // validated when building the impl data as well
     let generic_params = db.generic_params(impl_block.id.into());