Remove TraitItem and ImplItem in favor of AssocItem

7 files changed, 41 insertions, 88 deletions

diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 892208c1a..706d24c32 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -23,7 +23,7 @@ use crate::{
     },
     nameres::{CrateModuleId, ImportId, ModuleScope, Namespace},
     resolve::{Resolver, TypeNs},
-    traits::{TraitData, TraitItem},
+    traits::TraitData,
     ty::{
         primitive::{FloatBitness, FloatTy, IntBitness, IntTy, Signedness},
         InferenceResult, TraitRef,
@@ -269,7 +269,7 @@ impl Module {
 
         for impl_block in self.impl_blocks(db) {
             for item in impl_block.items(db) {
-                if let crate::ImplItem::Method(f) = item {
+                if let AssocItem::Function(f) = item {
                     f.diagnostics(db, sink);
                 }
             }
@@ -853,7 +853,7 @@ impl Trait {
         self.trait_data(db).name().clone()
     }
 
-    pub fn items(self, db: &impl DefDatabase) -> Vec<TraitItem> {
+    pub fn items(self, db: &impl DefDatabase) -> Vec<AssocItem> {
         self.trait_data(db).items().to_vec()
     }
 
@@ -906,7 +906,7 @@ impl Trait {
             .items()
             .iter()
             .filter_map(|item| match item {
-                TraitItem::TypeAlias(t) => Some(*t),
+                AssocItem::TypeAlias(t) => Some(*t),
                 _ => None,
             })
             .find(|t| &t.name(db) == name)
@@ -1030,23 +1030,8 @@ pub enum AssocItem {
     Const(Const),
     TypeAlias(TypeAlias),
 }
-
-impl From<TraitItem> for AssocItem {
-    fn from(t: TraitItem) -> Self {
-        match t {
-            TraitItem::Function(f) => AssocItem::Function(f),
-            TraitItem::Const(c) => AssocItem::Const(c),
-            TraitItem::TypeAlias(t) => AssocItem::TypeAlias(t),
-        }
-    }
-}
-
-impl From<crate::ImplItem> for AssocItem {
-    fn from(i: crate::ImplItem) -> Self {
-        match i {
-            crate::ImplItem::Method(f) => AssocItem::Function(f),
-            crate::ImplItem::Const(c) => AssocItem::Const(c),
-            crate::ImplItem::TypeAlias(t) => AssocItem::TypeAlias(t),
-        }
-    }
-}
+// FIXME: not every function, ... is actually an assoc item. maybe we should make
+// sure that you can only turn actual assoc items into AssocItems. This would
+// require not implementing From, and instead having some checked way of
+// casting them, and somehow making the constructors private, which would be annoying.
+impl_froms!(AssocItem: Function, Const, TypeAlias);
diff --git a/crates/ra_hir/src/impl_block.rs b/crates/ra_hir/src/impl_block.rs
index d26a024ed..c463d351c 100644
--- a/crates/ra_hir/src/impl_block.rs
+++ b/crates/ra_hir/src/impl_block.rs
@@ -15,7 +15,7 @@ use crate::{
     resolve::Resolver,
     ty::Ty,
     type_ref::TypeRef,
-    Const, Function, HasSource, HirFileId, Source, TraitRef, TypeAlias,
+    AssocItem, Const, Function, HasSource, HirFileId, Source, TraitRef, TypeAlias,
 };
 
 #[derive(Debug, Default, PartialEq, Eq)]
@@ -56,7 +56,7 @@ impl HasSource for ImplBlock {
 impl ImplBlock {
     pub(crate) fn containing(
         module_impl_blocks: Arc<ModuleImplBlocks>,
-        item: ImplItem,
+        item: AssocItem,
     ) -> Option<ImplBlock> {
         let impl_id = *module_impl_blocks.impls_by_def.get(&item)?;
         Some(ImplBlock { module: module_impl_blocks.module, impl_id })
@@ -91,7 +91,7 @@ impl ImplBlock {
         TraitRef::from_hir(db, &self.resolver(db), &self.target_trait(db)?, Some(target_ty))
     }
 
-    pub fn items(&self, db: &impl DefDatabase) -> Vec<ImplItem> {
+    pub fn items(&self, db: &impl DefDatabase) -> Vec<AssocItem> {
         db.impls_in_module(self.module).impls[self.impl_id].items().to_vec()
     }
 
@@ -113,7 +113,7 @@ impl ImplBlock {
 pub struct ImplData {
     target_trait: Option<TypeRef>,
     target_type: TypeRef,
-    items: Vec<ImplItem>,
+    items: Vec<AssocItem>,
     negative: bool,
 }
 
@@ -151,27 +151,11 @@ impl ImplData {
         &self.target_type
     }
 
-    pub fn items(&self) -> &[ImplItem] {
+    pub fn items(&self) -> &[AssocItem] {
         &self.items
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-//FIXME: rename to ImplDef?
-pub enum ImplItem {
-    Method(Function),
-    Const(Const),
-    TypeAlias(TypeAlias),
-    // Existential
-}
-impl_froms!(ImplItem: Const, TypeAlias);
-
-impl From<Function> for ImplItem {
-    fn from(func: Function) -> ImplItem {
-        ImplItem::Method(func)
-    }
-}
-
 #[derive(Debug, Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Hash)]
 pub struct ImplId(pub RawId);
 impl_arena_id!(ImplId);
@@ -185,7 +169,7 @@ impl_arena_id!(ImplId);
 pub struct ModuleImplBlocks {
     pub(crate) module: Module,
     pub(crate) impls: Arena<ImplId, ImplData>,
-    impls_by_def: FxHashMap<ImplItem, ImplId>,
+    impls_by_def: FxHashMap<AssocItem, ImplId>,
 }
 
 impl ModuleImplBlocks {
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index db82a463c..e7a576aa0 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -69,7 +69,7 @@ pub use self::{
     expr::ExprScopes,
     generics::{GenericParam, GenericParams, HasGenericParams},
     ids::{HirFileId, MacroCallId, MacroCallLoc, MacroDefId, MacroFile},
-    impl_block::{ImplBlock, ImplItem},
+    impl_block::ImplBlock,
     name::Name,
     nameres::{ImportId, Namespace, PerNs},
     path::{Path, PathKind},
diff --git a/crates/ra_hir/src/traits.rs b/crates/ra_hir/src/traits.rs
index 4c2f7980d..e39511518 100644
--- a/crates/ra_hir/src/traits.rs
+++ b/crates/ra_hir/src/traits.rs
@@ -9,13 +9,13 @@ use crate::{
     db::{AstDatabase, DefDatabase},
     ids::LocationCtx,
     name::AsName,
-    Const, Function, HasSource, Module, Name, Trait, TypeAlias,
+    AssocItem, Const, Function, HasSource, Module, Name, Trait, TypeAlias,
 };
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct TraitData {
     name: Option<Name>,
-    items: Vec<TraitItem>,
+    items: Vec<AssocItem>,
     auto: bool,
 }
 
@@ -48,7 +48,7 @@ impl TraitData {
         &self.name
     }
 
-    pub(crate) fn items(&self) -> &[TraitItem] {
+    pub(crate) fn items(&self) -> &[AssocItem] {
         &self.items
     }
 
@@ -57,22 +57,9 @@ impl TraitData {
     }
 }
 
-#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
-pub enum TraitItem {
-    Function(Function),
-    Const(Const),
-    TypeAlias(TypeAlias),
-    // Existential
-}
-// FIXME: not every function, ... is actually a trait item. maybe we should make
-// sure that you can only turn actual trait items into TraitItems. This would
-// require not implementing From, and instead having some checked way of
-// casting them.
-impl_froms!(TraitItem: Function, Const, TypeAlias);
-
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct TraitItemsIndex {
-    traits_by_def: FxHashMap<TraitItem, Trait>,
+    traits_by_def: FxHashMap<AssocItem, Trait>,
 }
 
 impl TraitItemsIndex {
@@ -88,7 +75,7 @@ impl TraitItemsIndex {
         index
     }
 
-    pub(crate) fn get_parent_trait(&self, item: TraitItem) -> Option<Trait> {
+    pub(crate) fn get_parent_trait(&self, item: AssocItem) -> Option<Trait> {
         self.traits_by_def.get(&item).cloned()
     }
 }
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index 181be0fcc..70da7f311 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -576,34 +576,32 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
 
         // Find impl
         // FIXME: consider trait candidates
-        let def = ty.clone().iterate_impl_items(self.db, krate, |item| match item {
-            crate::ImplItem::Method(func) => {
+        let item = ty.clone().iterate_impl_items(self.db, krate, |item| match item {
+            AssocItem::Function(func) => {
                 if segment.name == func.name(self.db) {
-                    Some(ValueNs::Function(func))
+                    Some(AssocItem::Function(func))
                 } else {
                     None
                 }
             }
 
-            crate::ImplItem::Const(konst) => {
+            AssocItem::Const(konst) => {
                 if konst.name(self.db).map_or(false, |n| n == segment.name) {
-                    Some(ValueNs::Const(konst))
+                    Some(AssocItem::Const(konst))
                 } else {
                     None
                 }
             }
-            crate::ImplItem::TypeAlias(_) => None,
+            AssocItem::TypeAlias(_) => None,
         })?;
+        let def = match item {
+            AssocItem::Function(f) => ValueNs::Function(f),
+            AssocItem::Const(c) => ValueNs::Const(c),
+            AssocItem::TypeAlias(_) => unreachable!(),
+        };
         let substs = self.find_self_types(&def, ty);
 
-        self.write_assoc_resolution(
-            id,
-            match def {
-                ValueNs::Function(f) => AssocItem::Function(f),
-                ValueNs::Const(c) => AssocItem::Const(c),
-                _ => unreachable!(),
-            },
-        );
+        self.write_assoc_resolution(id, item);
         Some((def, substs))
     }
 
diff --git a/crates/ra_hir/src/ty/method_resolution.rs b/crates/ra_hir/src/ty/method_resolution.rs
index be63806d4..8b46b11a9 100644
--- a/crates/ra_hir/src/ty/method_resolution.rs
+++ b/crates/ra_hir/src/ty/method_resolution.rs
@@ -11,13 +11,12 @@ use super::{autoderef, lower, Canonical, InEnvironment, TraitEnvironment, TraitR
 use crate::{
     db::HirDatabase,
     generics::HasGenericParams,
-    impl_block::{ImplBlock, ImplId, ImplItem},
+    impl_block::{ImplBlock, ImplId},
     nameres::CrateModuleId,
     resolve::Resolver,
-    traits::TraitItem,
     ty::primitive::{FloatBitness, UncertainFloatTy, UncertainIntTy},
     ty::{Ty, TypeCtor},
-    Crate, Function, Module, Name, Trait,
+    AssocItem, Crate, Function, Module, Name, Trait,
 };
 
 /// This is used as a key for indexing impls.
@@ -232,7 +231,7 @@ fn iterate_trait_method_candidates<T>(
         // iteration
         let mut known_implemented = inherently_implemented;
         for item in data.items() {
-            if let TraitItem::Function(m) = *item {
+            if let AssocItem::Function(m) = *item {
                 let data = m.data(db);
                 if name.map_or(true, |name| data.name() == name) && data.has_self_param() {
                     if !known_implemented {
@@ -264,7 +263,7 @@ fn iterate_inherent_methods<T>(
 
         for impl_block in impls.lookup_impl_blocks(&ty.value) {
             for item in impl_block.items(db) {
-                if let ImplItem::Method(f) = item {
+                if let AssocItem::Function(f) = item {
                     let data = f.data(db);
                     if name.map_or(true, |name| data.name() == name) && data.has_self_param() {
                         if let Some(result) = callback(&ty.value, f) {
@@ -304,7 +303,7 @@ impl Ty {
         self,
         db: &impl HirDatabase,
         krate: Crate,
-        mut callback: impl FnMut(ImplItem) -> Option<T>,
+        mut callback: impl FnMut(AssocItem) -> Option<T>,
     ) -> Option<T> {
         for krate in def_crates(db, krate, &self)? {
             let impls = db.impls_in_crate(krate);
diff --git a/crates/ra_hir/src/ty/traits/chalk.rs b/crates/ra_hir/src/ty/traits/chalk.rs
index c748e9d84..693d9b28f 100644
--- a/crates/ra_hir/src/ty/traits/chalk.rs
+++ b/crates/ra_hir/src/ty/traits/chalk.rs
@@ -21,7 +21,7 @@ use crate::{
         ApplicationTy, CallableDef, GenericPredicate, ProjectionTy, Substs, TraitRef, Ty, TypeCtor,
         TypeWalk,
     },
-    Crate, HasGenericParams, ImplBlock, ImplItem, Trait, TypeAlias,
+    AssocItem, Crate, HasGenericParams, ImplBlock, Trait, TypeAlias,
 };
 
 /// This represents a trait whose name we could not resolve.
@@ -496,7 +496,7 @@ pub(crate) fn trait_datum_query(
         .items(db)
         .into_iter()
         .filter_map(|trait_item| match trait_item {
-            crate::traits::TraitItem::TypeAlias(type_alias) => Some(type_alias),
+            crate::AssocItem::TypeAlias(type_alias) => Some(type_alias),
             _ => None,
         })
         .map(|type_alias| type_alias.to_chalk(db))
@@ -616,7 +616,7 @@ pub(crate) fn impl_datum_query(
         .items(db)
         .into_iter()
         .filter_map(|item| match item {
-            ImplItem::TypeAlias(t) => Some(t),
+            AssocItem::TypeAlias(t) => Some(t),
             _ => None,
         })
         .filter_map(|t| {