7 files changed, 96 insertions, 74 deletions

diff --git a/crates/ra_hir/src/ty/autoderef.rs b/crates/ra_hir/src/ty/autoderef.rs
index 872a4517d..5d8518041 100644
--- a/crates/ra_hir/src/ty/autoderef.rs
+++ b/crates/ra_hir/src/ty/autoderef.rs
@@ -5,11 +5,12 @@
 
 use std::iter::successors;
 
+use hir_def::resolver::Resolver;
 use hir_expand::name;
 use log::{info, warn};
 
 use super::{traits::Solution, Canonical, Substs, Ty, TypeWalk};
-use crate::{db::HirDatabase, generics::HasGenericParams, Resolver};
+use crate::{db::HirDatabase, generics::HasGenericParams};
 
 const AUTODEREF_RECURSION_LIMIT: usize = 10;
 
@@ -39,7 +40,7 @@ fn deref_by_trait(
     ty: &Canonical<Ty>,
 ) -> Option<Canonical<Ty>> {
     let krate = resolver.krate()?;
-    let deref_trait = match db.lang_item(krate, "deref".into())? {
+    let deref_trait = match db.lang_item(krate.into(), "deref".into())? {
         crate::lang_item::LangItemTarget::Trait(t) => t,
         _ => return None,
     };
@@ -71,7 +72,7 @@ fn deref_by_trait(
 
     let canonical = super::Canonical { num_vars: 1 + ty.num_vars, value: in_env };
 
-    let solution = db.trait_solve(krate, canonical)?;
+    let solution = db.trait_solve(krate.into(), canonical)?;
 
     match &solution {
         Solution::Unique(vars) => {
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index 7f9e81d64..69b13baef 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -23,7 +23,9 @@ use rustc_hash::FxHashMap;
 
 use hir_def::{
     path::known,
+    resolver::{HasResolver, Resolver, TypeNs},
     type_ref::{Mutability, TypeRef},
+    AdtId, DefWithBodyId,
 };
 use hir_expand::{diagnostics::DiagnosticSink, name};
 use ra_arena::map::ArenaMap;
@@ -40,10 +42,9 @@ use crate::{
     code_model::TypeAlias,
     db::HirDatabase,
     expr::{BindingAnnotation, Body, ExprId, PatId},
-    resolve::{HasResolver, Resolver, TypeNs},
     ty::infer::diagnostics::InferenceDiagnostic,
     Adt, AssocItem, ConstData, DefWithBody, FloatTy, FnData, Function, HasBody, IntTy, Path,
-    StructField, VariantDef,
+    StructField, Trait, VariantDef,
 };
 
 macro_rules! ty_app {
@@ -64,7 +65,7 @@ mod coerce;
 /// The entry point of type inference.
 pub fn infer_query(db: &impl HirDatabase, def: DefWithBody) -> Arc<InferenceResult> {
     let _p = profile("infer_query");
-    let resolver = def.resolver(db);
+    let resolver = DefWithBodyId::from(def).resolver(db);
     let mut ctx = InferenceContext::new(db, def, resolver);
 
     match def {
@@ -377,8 +378,9 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         for obligation in obligations {
             let in_env = InEnvironment::new(self.trait_env.clone(), obligation.clone());
             let canonicalized = self.canonicalizer().canonicalize_obligation(in_env);
-            let solution =
-                self.db.trait_solve(self.resolver.krate().unwrap(), canonicalized.value.clone());
+            let solution = self
+                .db
+                .trait_solve(self.resolver.krate().unwrap().into(), canonicalized.value.clone());
 
             match solution {
                 Some(Solution::Unique(substs)) => {
@@ -518,17 +520,17 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             // FIXME: this should resolve assoc items as well, see this example:
             // https://play.rust-lang.org/?gist=087992e9e22495446c01c0d4e2d69521
             match resolver.resolve_path_in_type_ns_fully(self.db, &path) {
-                Some(TypeNs::Adt(Adt::Struct(it))) => it.into(),
-                Some(TypeNs::Adt(Adt::Union(it))) => it.into(),
+                Some(TypeNs::AdtId(AdtId::StructId(it))) => it.into(),
+                Some(TypeNs::AdtId(AdtId::UnionId(it))) => it.into(),
                 Some(TypeNs::AdtSelfType(adt)) => adt.into(),
-                Some(TypeNs::EnumVariant(it)) => it.into(),
-                Some(TypeNs::TypeAlias(it)) => it.into(),
+                Some(TypeNs::EnumVariantId(it)) => it.into(),
+                Some(TypeNs::TypeAliasId(it)) => it.into(),
 
                 Some(TypeNs::SelfType(_)) |
                 Some(TypeNs::GenericParam(_)) |
                 Some(TypeNs::BuiltinType(_)) |
-                Some(TypeNs::Trait(_)) |
-                Some(TypeNs::Adt(Adt::Enum(_))) |
+                Some(TypeNs::TraitId(_)) |
+                Some(TypeNs::AdtId(AdtId::EnumId(_))) |
                 None => {
                     return (Ty::Unknown, None)
                 }
@@ -576,26 +578,26 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
 
     fn resolve_into_iter_item(&self) -> Option<TypeAlias> {
         let path = known::std_iter_into_iterator();
-        let trait_ = self.resolver.resolve_known_trait(self.db, &path)?;
+        let trait_: Trait = self.resolver.resolve_known_trait(self.db, &path)?.into();
         trait_.associated_type_by_name(self.db, &name::ITEM_TYPE)
     }
 
     fn resolve_ops_try_ok(&self) -> Option<TypeAlias> {
         let path = known::std_ops_try();
-        let trait_ = self.resolver.resolve_known_trait(self.db, &path)?;
+        let trait_: Trait = self.resolver.resolve_known_trait(self.db, &path)?.into();
         trait_.associated_type_by_name(self.db, &name::OK_TYPE)
     }
 
     fn resolve_future_future_output(&self) -> Option<TypeAlias> {
         let path = known::std_future_future();
-        let trait_ = self.resolver.resolve_known_trait(self.db, &path)?;
+        let trait_: Trait = self.resolver.resolve_known_trait(self.db, &path)?.into();
         trait_.associated_type_by_name(self.db, &name::OUTPUT_TYPE)
     }
 
     fn resolve_boxed_box(&self) -> Option<Adt> {
         let path = known::std_boxed_box();
         let struct_ = self.resolver.resolve_known_struct(self.db, &path)?;
-        Some(Adt::Struct(struct_))
+        Some(Adt::Struct(struct_.into()))
     }
 }
 
diff --git a/crates/ra_hir/src/ty/infer/coerce.rs b/crates/ra_hir/src/ty/infer/coerce.rs
index 6ea135126..0772b9df5 100644
--- a/crates/ra_hir/src/ty/infer/coerce.rs
+++ b/crates/ra_hir/src/ty/infer/coerce.rs
@@ -4,19 +4,19 @@
 //!
 //! See: https://doc.rust-lang.org/nomicon/coercions.html
 
+use hir_def::resolver::Resolver;
 use rustc_hash::FxHashMap;
-
 use test_utils::tested_by;
 
-use super::{InferTy, InferenceContext, TypeVarValue};
 use crate::{
     db::HirDatabase,
     lang_item::LangItemTarget,
-    resolve::Resolver,
     ty::{autoderef, Substs, Ty, TypeCtor, TypeWalk},
     Adt, Mutability,
 };
 
+use super::{InferTy, InferenceContext, TypeVarValue};
+
 impl<'a, D: HirDatabase> InferenceContext<'a, D> {
     /// Unify two types, but may coerce the first one to the second one
     /// using "implicit coercion rules" if needed.
@@ -49,8 +49,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         resolver: &Resolver,
     ) -> FxHashMap<(TypeCtor, TypeCtor), usize> {
         let krate = resolver.krate().unwrap();
-        let impls = match db.lang_item(krate, "coerce_unsized".into()) {
-            Some(LangItemTarget::Trait(trait_)) => db.impls_for_trait(krate, trait_),
+        let impls = match db.lang_item(krate.into(), "coerce_unsized".into()) {
+            Some(LangItemTarget::Trait(trait_)) => db.impls_for_trait(krate.into(), trait_),
             _ => return FxHashMap::default(),
         };
 
diff --git a/crates/ra_hir/src/ty/infer/expr.rs b/crates/ra_hir/src/ty/infer/expr.rs
index 5e68a1678..ac570075f 100644
--- a/crates/ra_hir/src/ty/infer/expr.rs
+++ b/crates/ra_hir/src/ty/infer/expr.rs
@@ -6,13 +6,13 @@ use std::sync::Arc;
 use hir_def::{
     builtin_type::Signedness,
     path::{GenericArg, GenericArgs},
+    resolver::resolver_for_expr,
 };
 use hir_expand::name;
 
-use super::{BindingMode, Expectation, InferenceContext, InferenceDiagnostic, TypeMismatch};
 use crate::{
     db::HirDatabase,
-    expr::{self, Array, BinaryOp, Expr, ExprId, Literal, Statement, UnaryOp},
+    expr::{Array, BinaryOp, Expr, ExprId, Literal, Statement, UnaryOp},
     generics::{GenericParams, HasGenericParams},
     ty::{
         autoderef, method_resolution, op, CallableDef, InferTy, IntTy, Mutability, Namespace,
@@ -22,6 +22,8 @@ use crate::{
     Adt, Name,
 };
 
+use super::{BindingMode, Expectation, InferenceContext, InferenceDiagnostic, TypeMismatch};
+
 impl<'a, D: HirDatabase> InferenceContext<'a, D> {
     pub(super) fn infer_expr(&mut self, tgt_expr: ExprId, expected: &Expectation) -> Ty {
         let ty = self.infer_expr_inner(tgt_expr, expected);
@@ -186,7 +188,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             }
             Expr::Path(p) => {
                 // FIXME this could be more efficient...
-                let resolver = expr::resolver_for_expr(self.db, self.owner, tgt_expr);
+                let resolver = resolver_for_expr(self.db, self.owner.into(), tgt_expr);
                 self.infer_path(&resolver, p, tgt_expr.into()).unwrap_or(Ty::Unknown)
             }
             Expr::Continue => Ty::simple(TypeCtor::Never),
diff --git a/crates/ra_hir/src/ty/infer/path.rs b/crates/ra_hir/src/ty/infer/path.rs
index 31ca675aa..70136e514 100644
--- a/crates/ra_hir/src/ty/infer/path.rs
+++ b/crates/ra_hir/src/ty/infer/path.rs
@@ -1,16 +1,19 @@
 //! Path expression resolution.
 
-use hir_def::path::PathSegment;
+use hir_def::{
+    path::PathSegment,
+    resolver::{ResolveValueResult, Resolver, TypeNs, ValueNs},
+};
 
-use super::{ExprOrPatId, InferenceContext, TraitRef};
 use crate::{
     db::HirDatabase,
     generics::HasGenericParams,
-    resolve::{ResolveValueResult, Resolver, TypeNs, ValueNs},
     ty::{method_resolution, Namespace, Substs, Ty, TypableDef, TypeWalk},
-    AssocItem, Container, Name, Path,
+    AssocItem, Container, Function, Name, Path,
 };
 
+use super::{ExprOrPatId, InferenceContext, TraitRef};
+
 impl<'a, D: HirDatabase> InferenceContext<'a, D> {
     pub(super) fn infer_path(
         &mut self,
@@ -60,11 +63,11 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                 let ty = self.resolve_ty_as_possible(&mut vec![], ty);
                 return Some(ty);
             }
-            ValueNs::Function(it) => it.into(),
-            ValueNs::Const(it) => it.into(),
-            ValueNs::Static(it) => it.into(),
-            ValueNs::Struct(it) => it.into(),
-            ValueNs::EnumVariant(it) => it.into(),
+            ValueNs::FunctionId(it) => it.into(),
+            ValueNs::ConstId(it) => it.into(),
+            ValueNs::StaticId(it) => it.into(),
+            ValueNs::StructId(it) => it.into(),
+            ValueNs::EnumVariantId(it) => it.into(),
         };
 
         let mut ty = self.db.type_for_def(typable, Namespace::Values);
@@ -94,13 +97,13 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         let is_before_last = remaining_segments.len() == 1;
 
         match (def, is_before_last) {
-            (TypeNs::Trait(trait_), true) => {
+            (TypeNs::TraitId(trait_), true) => {
                 let segment =
                     remaining_segments.last().expect("there should be at least one segment here");
                 let trait_ref = TraitRef::from_resolved_path(
                     self.db,
                     &self.resolver,
-                    trait_,
+                    trait_.into(),
                     resolved_segment,
                     None,
                 );
@@ -160,8 +163,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             AssocItem::TypeAlias(_) => None,
         })?;
         let def = match item {
-            AssocItem::Function(f) => ValueNs::Function(f),
-            AssocItem::Const(c) => ValueNs::Const(c),
+            AssocItem::Function(f) => ValueNs::FunctionId(f.id),
+            AssocItem::Const(c) => ValueNs::ConstId(c.id),
             AssocItem::TypeAlias(_) => unreachable!(),
         };
         let substs = Substs::build_for_def(self.db, item)
@@ -193,8 +196,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             method_resolution::LookupMode::Path,
             move |_ty, item| {
                 let def = match item {
-                    AssocItem::Function(f) => ValueNs::Function(f),
-                    AssocItem::Const(c) => ValueNs::Const(c),
+                    AssocItem::Function(f) => ValueNs::FunctionId(f.id),
+                    AssocItem::Const(c) => ValueNs::ConstId(c.id),
                     AssocItem::TypeAlias(_) => unreachable!(),
                 };
                 let substs = match item.container(self.db) {
@@ -224,7 +227,8 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
     }
 
     fn find_self_types(&self, def: &ValueNs, actual_def_ty: Ty) -> Option<Substs> {
-        if let ValueNs::Function(func) = def {
+        if let ValueNs::FunctionId(func) = def {
+            let func = Function::from(*func);
             // We only do the infer if parent has generic params
             let gen = func.generic_params(self.db);
             if gen.count_parent_params() == 0 {
diff --git a/crates/ra_hir/src/ty/lower.rs b/crates/ra_hir/src/ty/lower.rs
index 397ee7d5f..c6ad0811b 100644
--- a/crates/ra_hir/src/ty/lower.rs
+++ b/crates/ra_hir/src/ty/lower.rs
@@ -11,7 +11,9 @@ use std::sync::Arc;
 use hir_def::{
     builtin_type::{BuiltinFloat, BuiltinInt, BuiltinType},
     path::{GenericArg, PathSegment},
+    resolver::{HasResolver, Resolver, TypeNs},
     type_ref::{TypeBound, TypeRef},
+    GenericDefId,
 };
 
 use super::{
@@ -22,14 +24,13 @@ use crate::{
     db::HirDatabase,
     generics::HasGenericParams,
     generics::{GenericDef, WherePredicate},
-    resolve::{HasResolver, Resolver, TypeNs},
     ty::{
         primitive::{FloatTy, IntTy, Uncertain},
         Adt,
     },
     util::make_mut_slice,
-    Const, Enum, EnumVariant, Function, ModuleDef, Path, Static, Struct, StructField, Trait,
-    TypeAlias, Union, VariantDef,
+    Const, Enum, EnumVariant, Function, ImplBlock, ModuleDef, Path, Static, Struct, StructField,
+    Trait, TypeAlias, Union, VariantDef,
 };
 
 // FIXME: this is only really used in `type_for_def`, which contains a bunch of
@@ -156,9 +157,14 @@ impl Ty {
         remaining_segments: &[PathSegment],
     ) -> Ty {
         let ty = match resolution {
-            TypeNs::Trait(trait_) => {
-                let trait_ref =
-                    TraitRef::from_resolved_path(db, resolver, trait_, resolved_segment, None);
+            TypeNs::TraitId(trait_) => {
+                let trait_ref = TraitRef::from_resolved_path(
+                    db,
+                    resolver,
+                    trait_.into(),
+                    resolved_segment,
+                    None,
+                );
                 return if remaining_segments.len() == 1 {
                     let segment = &remaining_segments[0];
                     match trait_ref
@@ -189,18 +195,18 @@ impl Ty {
                 let name = resolved_segment.name.clone();
                 Ty::Param { idx, name }
             }
-            TypeNs::SelfType(impl_block) => impl_block.target_ty(db),
-            TypeNs::AdtSelfType(adt) => adt.ty(db),
+            TypeNs::SelfType(impl_block) => ImplBlock::from(impl_block).target_ty(db),
+            TypeNs::AdtSelfType(adt) => Adt::from(adt).ty(db),
 
-            TypeNs::Adt(it) => Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into()),
+            TypeNs::AdtId(it) => Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into()),
             TypeNs::BuiltinType(it) => {
                 Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into())
             }
-            TypeNs::TypeAlias(it) => {
+            TypeNs::TypeAliasId(it) => {
                 Ty::from_hir_path_inner(db, resolver, resolved_segment, it.into())
             }
             // FIXME: report error
-            TypeNs::EnumVariant(_) => return Ty::Unknown,
+            TypeNs::EnumVariantId(_) => return Ty::Unknown,
         };
 
         Ty::from_type_relative_path(db, resolver, ty, remaining_segments)
@@ -247,7 +253,7 @@ impl Ty {
             Some(def) => def,
             None => return Ty::Unknown, // this can't actually happen
         };
-        let predicates = db.generic_predicates_for_param(def, param_idx);
+        let predicates = db.generic_predicates_for_param(def.into(), param_idx);
         let traits_from_env = predicates.iter().filter_map(|pred| match pred {
             GenericPredicate::Implemented(tr) if tr.self_ty() == &self_ty => Some(tr.trait_),
             _ => None,
@@ -391,11 +397,11 @@ impl TraitRef {
         explicit_self_ty: Option<Ty>,
     ) -> Option<Self> {
         let resolved = match resolver.resolve_path_in_type_ns_fully(db, &path)? {
-            TypeNs::Trait(tr) => tr,
+            TypeNs::TraitId(tr) => tr,
             _ => return None,
         };
         let segment = path.segments.last().expect("path should have at least one segment");
-        Some(TraitRef::from_resolved_path(db, resolver, resolved, segment, explicit_self_ty))
+        Some(TraitRef::from_resolved_path(db, resolver, resolved.into(), segment, explicit_self_ty))
     }
 
     pub(super) fn from_resolved_path(
@@ -548,8 +554,8 @@ pub(crate) fn callable_item_sig(db: &impl HirDatabase, def: CallableDef) -> FnSi
 pub(crate) fn type_for_field(db: &impl HirDatabase, field: StructField) -> Ty {
     let parent_def = field.parent_def(db);
     let resolver = match parent_def {
-        VariantDef::Struct(it) => it.resolver(db),
-        VariantDef::EnumVariant(it) => it.parent_enum(db).resolver(db),
+        VariantDef::Struct(it) => it.id.resolver(db),
+        VariantDef::EnumVariant(it) => it.parent.id.resolver(db),
     };
     let var_data = parent_def.variant_data(db);
     let type_ref = &var_data.fields().unwrap()[field.id].type_ref;
@@ -569,7 +575,7 @@ pub(crate) fn generic_predicates_for_param_query(
     def: GenericDef,
     param_idx: u32,
 ) -> Arc<[GenericPredicate]> {
-    let resolver = def.resolver(db);
+    let resolver = GenericDefId::from(def).resolver(db);
     resolver
         .where_predicates_in_scope()
         // we have to filter out all other predicates *first*, before attempting to lower them
@@ -595,7 +601,7 @@ pub(crate) fn generic_predicates_query(
     db: &impl HirDatabase,
     def: GenericDef,
 ) -> Arc<[GenericPredicate]> {
-    let resolver = def.resolver(db);
+    let resolver = GenericDefId::from(def).resolver(db);
     resolver
         .where_predicates_in_scope()
         .flat_map(|pred| GenericPredicate::from_where_predicate(db, &resolver, pred))
@@ -604,7 +610,7 @@ pub(crate) fn generic_predicates_query(
 
 /// Resolve the default type params from generics
 pub(crate) fn generic_defaults_query(db: &impl HirDatabase, def: GenericDef) -> Substs {
-    let resolver = def.resolver(db);
+    let resolver = GenericDefId::from(def).resolver(db);
     let generic_params = def.generic_params(db);
 
     let defaults = generic_params
@@ -618,7 +624,7 @@ pub(crate) fn generic_defaults_query(db: &impl HirDatabase, def: GenericDef) ->
 
 fn fn_sig_for_fn(db: &impl HirDatabase, def: Function) -> FnSig {
     let data = def.data(db);
-    let resolver = def.resolver(db);
+    let resolver = def.id.resolver(db);
     let params = data.params().iter().map(|tr| Ty::from_hir(db, &resolver, tr)).collect::<Vec<_>>();
     let ret = Ty::from_hir(db, &resolver, data.ret_type());
     FnSig::from_params_and_return(params, ret)
@@ -635,7 +641,7 @@ fn type_for_fn(db: &impl HirDatabase, def: Function) -> Ty {
 /// Build the declared type of a const.
 fn type_for_const(db: &impl HirDatabase, def: Const) -> Ty {
     let data = def.data(db);
-    let resolver = def.resolver(db);
+    let resolver = def.id.resolver(db);
 
     Ty::from_hir(db, &resolver, data.type_ref())
 }
@@ -643,7 +649,7 @@ fn type_for_const(db: &impl HirDatabase, def: Const) -> Ty {
 /// Build the declared type of a static.
 fn type_for_static(db: &impl HirDatabase, def: Static) -> Ty {
     let data = def.data(db);
-    let resolver = def.resolver(db);
+    let resolver = def.id.resolver(db);
 
     Ty::from_hir(db, &resolver, data.type_ref())
 }
@@ -695,7 +701,7 @@ fn fn_sig_for_struct_constructor(db: &impl HirDatabase, def: Struct) -> FnSig {
         Some(fields) => fields,
         None => panic!("fn_sig_for_struct_constructor called on unit struct"),
     };
-    let resolver = def.resolver(db);
+    let resolver = def.id.resolver(db);
     let params = fields
         .iter()
         .map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
@@ -721,7 +727,7 @@ fn fn_sig_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariant)
         Some(fields) => fields,
         None => panic!("fn_sig_for_enum_variant_constructor called for unit variant"),
     };
-    let resolver = def.parent_enum(db).resolver(db);
+    let resolver = def.parent.id.resolver(db);
     let params = fields
         .iter()
         .map(|(_, field)| Ty::from_hir(db, &resolver, &field.type_ref))
@@ -750,7 +756,7 @@ fn type_for_adt(db: &impl HirDatabase, adt: impl Into<Adt> + HasGenericParams) -
 
 fn type_for_type_alias(db: &impl HirDatabase, t: TypeAlias) -> Ty {
     let generics = t.generic_params(db);
-    let resolver = t.resolver(db);
+    let resolver = t.id.resolver(db);
     let type_ref = t.type_ref(db);
     let substs = Substs::identity(&generics);
     let inner = Ty::from_hir(db, &resolver, &type_ref.unwrap_or(TypeRef::Error));
diff --git a/crates/ra_hir/src/ty/method_resolution.rs b/crates/ra_hir/src/ty/method_resolution.rs
index f377fca48..64adb814d 100644
--- a/crates/ra_hir/src/ty/method_resolution.rs
+++ b/crates/ra_hir/src/ty/method_resolution.rs
@@ -5,11 +5,11 @@
 use std::sync::Arc;
 
 use arrayvec::ArrayVec;
+use hir_def::resolver::Resolver;
 use rustc_hash::FxHashMap;
 
 use crate::{
     db::HirDatabase,
-    resolve::Resolver,
     ty::primitive::{FloatBitness, Uncertain},
     ty::{Ty, TypeCtor},
     AssocItem, Crate, Function, ImplBlock, Module, Mutability, Name, Trait,
@@ -172,9 +172,14 @@ pub(crate) fn iterate_method_candidates<T>(
             // rustc does an autoderef and then autoref again).
 
             for derefed_ty in autoderef::autoderef(db, resolver, ty.clone()) {
-                if let Some(result) =
-                    iterate_inherent_methods(&derefed_ty, db, name, mode, krate, &mut callback)
-                {
+                if let Some(result) = iterate_inherent_methods(
+                    &derefed_ty,
+                    db,
+                    name,
+                    mode,
+                    krate.into(),
+                    &mut callback,
+                ) {
                     return Some(result);
                 }
                 if let Some(result) = iterate_trait_method_candidates(
@@ -192,7 +197,7 @@ pub(crate) fn iterate_method_candidates<T>(
         LookupMode::Path => {
             // No autoderef for path lookups
             if let Some(result) =
-                iterate_inherent_methods(&ty, db, name, mode, krate, &mut callback)
+                iterate_inherent_methods(&ty, db, name, mode, krate.into(), &mut callback)
             {
                 return Some(result);
             }
@@ -224,7 +229,9 @@ fn iterate_trait_method_candidates<T>(
         .trait_predicates_for_self_ty(&ty.value)
         .map(|tr| tr.trait_)
         .flat_map(|t| t.all_super_traits(db));
-    let traits = inherent_trait.chain(traits_from_env).chain(resolver.traits_in_scope(db));
+    let traits = inherent_trait
+        .chain(traits_from_env)
+        .chain(resolver.traits_in_scope(db).into_iter().map(Trait::from));
     'traits: for t in traits {
         let data = t.trait_data(db);
 
@@ -238,7 +245,7 @@ fn iterate_trait_method_candidates<T>(
             }
             if !known_implemented {
                 let goal = generic_implements_goal(db, env.clone(), t, ty.clone());
-                if db.trait_solve(krate, goal).is_none() {
+                if db.trait_solve(krate.into(), goal).is_none() {
                     continue 'traits;
                 }
             }