Use `Name`s instead of Strings in the completion rendering api

10 files changed, 165 insertions, 142 deletions

diff --git a/crates/ide_completion/src/completions.rs b/crates/ide_completion/src/completions.rs
index 78154bf3e..151bf3783 100644
--- a/crates/ide_completion/src/completions.rs
+++ b/crates/ide_completion/src/completions.rs
@@ -18,7 +18,7 @@ pub(crate) mod unqualified_path;
 
 use std::iter;
 
-use hir::{known, ModPath, ScopeDef, Type};
+use hir::known;
 use ide_db::SymbolKind;
 
 use crate::{
@@ -69,12 +69,17 @@ impl Completions {
         items.into_iter().for_each(|item| self.add(item.into()))
     }
 
-    pub(crate) fn add_field(&mut self, ctx: &CompletionContext, field: hir::Field, ty: &Type) {
+    pub(crate) fn add_field(&mut self, ctx: &CompletionContext, field: hir::Field, ty: &hir::Type) {
         let item = render_field(RenderContext::new(ctx), field, ty);
         self.add(item);
     }
 
-    pub(crate) fn add_tuple_field(&mut self, ctx: &CompletionContext, field: usize, ty: &Type) {
+    pub(crate) fn add_tuple_field(
+        &mut self,
+        ctx: &CompletionContext,
+        field: usize,
+        ty: &hir::Type,
+    ) {
         let item = render_tuple_field(RenderContext::new(ctx), field, ty);
         self.add(item);
     }
@@ -89,8 +94,8 @@ impl Completions {
     pub(crate) fn add_resolution(
         &mut self,
         ctx: &CompletionContext,
-        local_name: String,
-        resolution: &ScopeDef,
+        local_name: hir::Name,
+        resolution: &hir::ScopeDef,
     ) {
         if let Some(item) = render_resolution(RenderContext::new(ctx), local_name, resolution) {
             self.add(item);
@@ -100,7 +105,7 @@ impl Completions {
     pub(crate) fn add_macro(
         &mut self,
         ctx: &CompletionContext,
-        name: Option<String>,
+        name: Option<hir::Name>,
         macro_: hir::MacroDef,
     ) {
         let name = match name {
@@ -116,7 +121,7 @@ impl Completions {
         &mut self,
         ctx: &CompletionContext,
         func: hir::Function,
-        local_name: Option<String>,
+        local_name: Option<hir::Name>,
     ) {
         if let Some(item) = render_fn(RenderContext::new(ctx), None, local_name, func) {
             self.add(item)
@@ -127,7 +132,7 @@ impl Completions {
         &mut self,
         ctx: &CompletionContext,
         func: hir::Function,
-        local_name: Option<String>,
+        local_name: Option<hir::Name>,
     ) {
         if let Some(item) = render_method(RenderContext::new(ctx), None, local_name, func) {
             self.add(item)
@@ -149,7 +154,7 @@ impl Completions {
         &mut self,
         ctx: &CompletionContext,
         variant: hir::Variant,
-        path: ModPath,
+        path: hir::ModPath,
     ) {
         if let Some(item) = render_variant_pat(RenderContext::new(ctx), variant, None, Some(path)) {
             self.add(item);
@@ -183,7 +188,7 @@ impl Completions {
         &mut self,
         ctx: &CompletionContext,
         variant: hir::Variant,
-        path: ModPath,
+        path: hir::ModPath,
     ) {
         let item = render_variant(RenderContext::new(ctx), None, None, variant, Some(path));
         self.add(item);
@@ -193,7 +198,7 @@ impl Completions {
         &mut self,
         ctx: &CompletionContext,
         variant: hir::Variant,
-        local_name: Option<String>,
+        local_name: Option<hir::Name>,
     ) {
         let item = render_variant(RenderContext::new(ctx), None, local_name, variant, None);
         self.add(item);
diff --git a/crates/ide_completion/src/completions/lifetime.rs b/crates/ide_completion/src/completions/lifetime.rs
index 5f6285b84..8ccccb646 100644
--- a/crates/ide_completion/src/completions/lifetime.rs
+++ b/crates/ide_completion/src/completions/lifetime.rs
@@ -16,15 +16,14 @@ pub(crate) fn complete_lifetime(acc: &mut Completions, ctx: &CompletionContext)
         (Some(lt), Some(lp)) if lp == lt.clone() => return,
         (Some(_), Some(lp)) => {
             lp_string = lp.to_string();
-            Some(&lp_string)
+            Some(&*lp_string)
         }
         _ => None,
     };
 
     ctx.scope.process_all_names(&mut |name, res| {
         if let ScopeDef::GenericParam(hir::GenericParam::LifetimeParam(_)) = res {
-            let name = name.to_string();
-            if param_lifetime != Some(&name) {
+            if param_lifetime != Some(&*name.to_string()) {
                 acc.add_resolution(ctx, name, &res);
             }
         }
@@ -41,7 +40,7 @@ pub(crate) fn complete_label(acc: &mut Completions, ctx: &CompletionContext) {
     }
     ctx.scope.process_all_names(&mut |name, res| {
         if let ScopeDef::Label(_) = res {
-            acc.add_resolution(ctx, name.to_string(), &res);
+            acc.add_resolution(ctx, name, &res);
         }
     });
 }
diff --git a/crates/ide_completion/src/completions/macro_in_item_position.rs b/crates/ide_completion/src/completions/macro_in_item_position.rs
index ec57aee30..202e71215 100644
--- a/crates/ide_completion/src/completions/macro_in_item_position.rs
+++ b/crates/ide_completion/src/completions/macro_in_item_position.rs
@@ -11,11 +11,11 @@ pub(crate) fn complete_macro_in_item_position(acc: &mut Completions, ctx: &Compl
 
     ctx.scope.process_all_names(&mut |name, res| {
         if let hir::ScopeDef::MacroDef(mac) = res {
-            acc.add_macro(ctx, Some(name.to_string()), mac);
+            acc.add_macro(ctx, Some(name.clone()), mac);
         }
         // FIXME: This should be done in qualified_path/unqualified_path instead?
         if let hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = res {
-            acc.add_resolution(ctx, name.to_string(), &res);
+            acc.add_resolution(ctx, name, &res);
         }
     })
 }
diff --git a/crates/ide_completion/src/completions/pattern.rs b/crates/ide_completion/src/completions/pattern.rs
index b84e9a967..8a728c67e 100644
--- a/crates/ide_completion/src/completions/pattern.rs
+++ b/crates/ide_completion/src/completions/pattern.rs
@@ -51,7 +51,7 @@ pub(crate) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
             _ => false,
         };
         if add_resolution {
-            acc.add_resolution(ctx, name.to_string(), &res);
+            acc.add_resolution(ctx, name, &res);
         }
     });
 }
diff --git a/crates/ide_completion/src/completions/qualified_path.rs b/crates/ide_completion/src/completions/qualified_path.rs
index 7a0e1ead3..de58ce1cd 100644
--- a/crates/ide_completion/src/completions/qualified_path.rs
+++ b/crates/ide_completion/src/completions/qualified_path.rs
@@ -1,6 +1,6 @@
 //! Completion of paths, i.e. `some::prefix::$0`.
 
-use hir::{Adt, HasVisibility, PathResolution, ScopeDef};
+use hir::HasVisibility;
 use rustc_hash::FxHashSet;
 use syntax::AstNode;
 
@@ -21,14 +21,14 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
     };
     let context_module = ctx.scope.module();
     if ctx.expects_assoc_item() {
-        if let PathResolution::Def(hir::ModuleDef::Module(module)) = resolution {
+        if let hir::PathResolution::Def(hir::ModuleDef::Module(module)) = resolution {
             let module_scope = module.scope(ctx.db, context_module);
             for (name, def) in module_scope {
-                if let ScopeDef::MacroDef(macro_def) = def {
-                    acc.add_macro(ctx, Some(name.to_string()), macro_def);
+                if let hir::ScopeDef::MacroDef(macro_def) = def {
+                    acc.add_macro(ctx, Some(name.clone()), macro_def);
                 }
-                if let ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = def {
-                    acc.add_resolution(ctx, name.to_string(), &def);
+                if let hir::ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = def {
+                    acc.add_resolution(ctx, name, &def);
                 }
             }
         }
@@ -42,11 +42,11 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
     });
 
     match resolution {
-        PathResolution::Def(hir::ModuleDef::Module(module)) => {
+        hir::PathResolution::Def(hir::ModuleDef::Module(module)) => {
             let module_scope = module.scope(ctx.db, context_module);
             for (name, def) in module_scope {
                 if ctx.use_item_syntax.is_some() {
-                    if let ScopeDef::Unknown = def {
+                    if let hir::ScopeDef::Unknown = def {
                         if let Some(name_ref) = ctx.name_ref_syntax.as_ref() {
                             if name_ref.syntax().text() == name.to_string().as_str() {
                                 // for `use self::foo$0`, don't suggest `foo` as a completion
@@ -57,20 +57,20 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                     }
                 }
 
-                acc.add_resolution(ctx, name.to_string(), &def);
+                acc.add_resolution(ctx, name, &def);
             }
         }
-        PathResolution::Def(def @ hir::ModuleDef::Adt(_))
-        | PathResolution::Def(def @ hir::ModuleDef::TypeAlias(_))
-        | PathResolution::Def(def @ hir::ModuleDef::BuiltinType(_)) => {
-            if let hir::ModuleDef::Adt(Adt::Enum(e)) = def {
+        hir::PathResolution::Def(def @ hir::ModuleDef::Adt(_))
+        | hir::PathResolution::Def(def @ hir::ModuleDef::TypeAlias(_))
+        | hir::PathResolution::Def(def @ hir::ModuleDef::BuiltinType(_)) => {
+            if let hir::ModuleDef::Adt(hir::Adt::Enum(e)) = def {
                 add_enum_variants(ctx, acc, e);
             }
             let ty = match def {
                 hir::ModuleDef::Adt(adt) => adt.ty(ctx.db),
                 hir::ModuleDef::TypeAlias(a) => {
                     let ty = a.ty(ctx.db);
-                    if let Some(Adt::Enum(e)) = ty.as_adt() {
+                    if let Some(hir::Adt::Enum(e)) = ty.as_adt() {
                         cov_mark::hit!(completes_variant_through_alias);
                         add_enum_variants(ctx, acc, e);
                     }
@@ -117,7 +117,7 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                 });
             }
         }
-        PathResolution::Def(hir::ModuleDef::Trait(t)) => {
+        hir::PathResolution::Def(hir::ModuleDef::Trait(t)) => {
             // Handles `Trait::assoc` as well as `<Ty as Trait>::assoc`.
             for item in t.items(ctx.db) {
                 if context_module.map_or(false, |m| !item.is_visible_from(ctx.db, m)) {
@@ -130,15 +130,15 @@ pub(crate) fn complete_qualified_path(acc: &mut Completions, ctx: &CompletionCon
                 }
             }
         }
-        PathResolution::TypeParam(_) | PathResolution::SelfType(_) => {
+        hir::PathResolution::TypeParam(_) | hir::PathResolution::SelfType(_) => {
             if let Some(krate) = ctx.krate {
                 let ty = match resolution {
-                    PathResolution::TypeParam(param) => param.ty(ctx.db),
-                    PathResolution::SelfType(impl_def) => impl_def.self_ty(ctx.db),
+                    hir::PathResolution::TypeParam(param) => param.ty(ctx.db),
+                    hir::PathResolution::SelfType(impl_def) => impl_def.self_ty(ctx.db),
                     _ => return,
                 };
 
-                if let Some(Adt::Enum(e)) = ty.as_adt() {
+                if let Some(hir::Adt::Enum(e)) = ty.as_adt() {
                     add_enum_variants(ctx, acc, e);
                 }
 
diff --git a/crates/ide_completion/src/completions/unqualified_path.rs b/crates/ide_completion/src/completions/unqualified_path.rs
index ede07f605..9db8516d0 100644
--- a/crates/ide_completion/src/completions/unqualified_path.rs
+++ b/crates/ide_completion/src/completions/unqualified_path.rs
@@ -14,10 +14,10 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
     if ctx.expects_assoc_item() {
         ctx.scope.process_all_names(&mut |name, def| {
             if let ScopeDef::MacroDef(macro_def) = def {
-                acc.add_macro(ctx, Some(name.to_string()), macro_def);
+                acc.add_macro(ctx, Some(name.clone()), macro_def);
             }
             if let ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = def {
-                acc.add_resolution(ctx, name.to_string(), &def);
+                acc.add_resolution(ctx, name, &def);
             }
         });
         return;
@@ -27,7 +27,7 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
         cov_mark::hit!(only_completes_modules_in_import);
         ctx.scope.process_all_names(&mut |name, res| {
             if let ScopeDef::ModuleDef(hir::ModuleDef::Module(_)) = res {
-                acc.add_resolution(ctx, name.to_string(), &res);
+                acc.add_resolution(ctx, name, &res);
             }
         });
         return;
@@ -45,7 +45,7 @@ pub(crate) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC
             cov_mark::hit!(skip_lifetime_completion);
             return;
         }
-        acc.add_resolution(ctx, name.to_string(), &res);
+        acc.add_resolution(ctx, name, &res);
     });
 }
 
diff --git a/crates/ide_completion/src/render.rs b/crates/ide_completion/src/render.rs
index 91300c56e..425dd0247 100644
--- a/crates/ide_completion/src/render.rs
+++ b/crates/ide_completion/src/render.rs
@@ -10,9 +10,7 @@ pub(crate) mod type_alias;
 
 mod builder_ext;
 
-use hir::{
-    AsAssocItem, Documentation, HasAttrs, HirDisplay, ModuleDef, Mutability, ScopeDef, Type,
-};
+use hir::{AsAssocItem, HasAttrs, HirDisplay};
 use ide_db::{
     helpers::{item_name, SnippetCap},
     RootDatabase, SymbolKind,
@@ -21,31 +19,30 @@ use syntax::TextRange;
 
 use crate::{
     item::{CompletionRelevanceTypeMatch, ImportEdit},
+    render::{enum_variant::render_variant, function::render_fn, macro_::render_macro},
     CompletionContext, CompletionItem, CompletionItemKind, CompletionKind, CompletionRelevance,
 };
 
-use crate::render::{enum_variant::render_variant, function::render_fn, macro_::render_macro};
-
 pub(crate) fn render_field<'a>(
     ctx: RenderContext<'a>,
     field: hir::Field,
-    ty: &Type,
+    ty: &hir::Type,
 ) -> CompletionItem {
-    Render::new(ctx).add_field(field, ty)
+    Render::new(ctx).render_field(field, ty)
 }
 
 pub(crate) fn render_tuple_field<'a>(
     ctx: RenderContext<'a>,
     field: usize,
-    ty: &Type,
+    ty: &hir::Type,
 ) -> CompletionItem {
-    Render::new(ctx).add_tuple_field(field, ty)
+    Render::new(ctx).render_tuple_field(field, ty)
 }
 
 pub(crate) fn render_resolution<'a>(
     ctx: RenderContext<'a>,
-    local_name: String,
-    resolution: &ScopeDef,
+    local_name: hir::Name,
+    resolution: &hir::ScopeDef,
 ) -> Option<CompletionItem> {
     Render::new(ctx).render_resolution(local_name, None, resolution)
 }
@@ -54,12 +51,12 @@ pub(crate) fn render_resolution_with_import<'a>(
     ctx: RenderContext<'a>,
     import_edit: ImportEdit,
 ) -> Option<CompletionItem> {
-    let resolution = ScopeDef::from(import_edit.import.original_item);
+    let resolution = hir::ScopeDef::from(import_edit.import.original_item);
     let local_name = match resolution {
-        ScopeDef::ModuleDef(ModuleDef::Function(f)) => f.name(ctx.completion.db).to_string(),
-        ScopeDef::ModuleDef(ModuleDef::Const(c)) => c.name(ctx.completion.db)?.to_string(),
-        ScopeDef::ModuleDef(ModuleDef::TypeAlias(t)) => t.name(ctx.completion.db).to_string(),
-        _ => item_name(ctx.db(), import_edit.import.original_item)?.to_string(),
+        hir::ScopeDef::ModuleDef(hir::ModuleDef::Function(f)) => f.name(ctx.completion.db),
+        hir::ScopeDef::ModuleDef(hir::ModuleDef::Const(c)) => c.name(ctx.completion.db)?,
+        hir::ScopeDef::ModuleDef(hir::ModuleDef::TypeAlias(t)) => t.name(ctx.completion.db),
+        _ => item_name(ctx.db(), import_edit.import.original_item)?,
     };
     Render::new(ctx).render_resolution(local_name, Some(import_edit), &resolution).map(
         |mut item| {
@@ -113,7 +110,7 @@ impl<'a> RenderContext<'a> {
             || assoc.containing_trait(db).map(|trait_| self.is_deprecated(trait_)).unwrap_or(false)
     }
 
-    fn docs(&self, node: impl HasAttrs) -> Option<Documentation> {
+    fn docs(&self, node: impl HasAttrs) -> Option<hir::Documentation> {
         node.docs(self.db())
     }
 }
@@ -129,14 +126,11 @@ impl<'a> Render<'a> {
         Render { ctx }
     }
 
-    fn add_field(&mut self, field: hir::Field, ty: &Type) -> CompletionItem {
+    fn render_field(&self, field: hir::Field, ty: &hir::Type) -> CompletionItem {
         let is_deprecated = self.ctx.is_deprecated(field);
-        let name = field.name(self.ctx.db());
-        let mut item = CompletionItem::new(
-            CompletionKind::Reference,
-            self.ctx.source_range(),
-            name.to_string(),
-        );
+        let name = field.name(self.ctx.db()).to_string();
+        let mut item =
+            CompletionItem::new(CompletionKind::Reference, self.ctx.source_range(), name.clone());
         item.kind(SymbolKind::Field)
             .detail(ty.display(self.ctx.db()).to_string())
             .set_documentation(field.docs(self.ctx.db()))
@@ -144,7 +138,7 @@ impl<'a> Render<'a> {
 
         item.set_relevance(CompletionRelevance {
             type_match: compute_type_match(self.ctx.completion, ty),
-            exact_name_match: compute_exact_name_match(self.ctx.completion, name.to_string()),
+            exact_name_match: compute_exact_name_match(self.ctx.completion, &name),
             ..CompletionRelevance::default()
         });
 
@@ -157,7 +151,7 @@ impl<'a> Render<'a> {
         item.build()
     }
 
-    fn add_tuple_field(&mut self, field: usize, ty: &Type) -> CompletionItem {
+    fn render_tuple_field(&self, field: usize, ty: &hir::Type) -> CompletionItem {
         let mut item = CompletionItem::new(
             CompletionKind::Reference,
             self.ctx.source_range(),
@@ -171,71 +165,82 @@ impl<'a> Render<'a> {
 
     fn render_resolution(
         self,
-        local_name: String,
+        local_name: hir::Name,
         import_to_add: Option<ImportEdit>,
-        resolution: &ScopeDef,
+        resolution: &hir::ScopeDef,
     ) -> Option<CompletionItem> {
         let _p = profile::span("render_resolution");
         use hir::ModuleDef::*;
 
         let completion_kind = match resolution {
-            ScopeDef::ModuleDef(BuiltinType(..)) => CompletionKind::BuiltinType,
+            hir::ScopeDef::ModuleDef(BuiltinType(..)) => CompletionKind::BuiltinType,
             _ => CompletionKind::Reference,
         };
 
         let kind = match resolution {
-            ScopeDef::ModuleDef(Function(func)) => {
+            hir::ScopeDef::ModuleDef(Function(func)) => {
                 return render_fn(self.ctx, import_to_add, Some(local_name), *func);
             }
-            ScopeDef::ModuleDef(Variant(_)) if self.ctx.completion.is_pat_or_const.is_some() => {
+            hir::ScopeDef::ModuleDef(Variant(_))
+                if self.ctx.completion.is_pat_or_const.is_some() =>
+            {
                 CompletionItemKind::SymbolKind(SymbolKind::Variant)
             }
-            ScopeDef::ModuleDef(Variant(var)) => {
+            hir::ScopeDef::ModuleDef(Variant(var)) => {
                 let item = render_variant(self.ctx, import_to_add, Some(local_name), *var, None);
                 return Some(item);
             }
-            ScopeDef::MacroDef(mac) => {
+            hir::ScopeDef::MacroDef(mac) => {
                 let item = render_macro(self.ctx, import_to_add, local_name, *mac);
                 return item;
             }
 
-            ScopeDef::ModuleDef(Module(..)) => CompletionItemKind::SymbolKind(SymbolKind::Module),
-            ScopeDef::ModuleDef(Adt(adt)) => CompletionItemKind::SymbolKind(match adt {
+            hir::ScopeDef::ModuleDef(Module(..)) => {
+                CompletionItemKind::SymbolKind(SymbolKind::Module)
+            }
+            hir::ScopeDef::ModuleDef(Adt(adt)) => CompletionItemKind::SymbolKind(match adt {
                 hir::Adt::Struct(_) => SymbolKind::Struct,
                 hir::Adt::Union(_) => SymbolKind::Union,
                 hir::Adt::Enum(_) => SymbolKind::Enum,
             }),
-            ScopeDef::ModuleDef(Const(..)) => CompletionItemKind::SymbolKind(SymbolKind::Const),
-            ScopeDef::ModuleDef(Static(..)) => CompletionItemKind::SymbolKind(SymbolKind::Static),
-            ScopeDef::ModuleDef(Trait(..)) => CompletionItemKind::SymbolKind(SymbolKind::Trait),
-            ScopeDef::ModuleDef(TypeAlias(..)) => {
+            hir::ScopeDef::ModuleDef(Const(..)) => {
+                CompletionItemKind::SymbolKind(SymbolKind::Const)
+            }
+            hir::ScopeDef::ModuleDef(Static(..)) => {
+                CompletionItemKind::SymbolKind(SymbolKind::Static)
+            }
+            hir::ScopeDef::ModuleDef(Trait(..)) => {
+                CompletionItemKind::SymbolKind(SymbolKind::Trait)
+            }
+            hir::ScopeDef::ModuleDef(TypeAlias(..)) => {
                 CompletionItemKind::SymbolKind(SymbolKind::TypeAlias)
             }
-            ScopeDef::ModuleDef(BuiltinType(..)) => CompletionItemKind::BuiltinType,
-            ScopeDef::GenericParam(param) => CompletionItemKind::SymbolKind(match param {
+            hir::ScopeDef::ModuleDef(BuiltinType(..)) => CompletionItemKind::BuiltinType,
+            hir::ScopeDef::GenericParam(param) => CompletionItemKind::SymbolKind(match param {
                 hir::GenericParam::TypeParam(_) => SymbolKind::TypeParam,
                 hir::GenericParam::LifetimeParam(_) => SymbolKind::LifetimeParam,
                 hir::GenericParam::ConstParam(_) => SymbolKind::ConstParam,
             }),
-            ScopeDef::Local(..) => CompletionItemKind::SymbolKind(SymbolKind::Local),
-            ScopeDef::Label(..) => CompletionItemKind::SymbolKind(SymbolKind::Label),
-            ScopeDef::AdtSelfType(..) | ScopeDef::ImplSelfType(..) => {
+            hir::ScopeDef::Local(..) => CompletionItemKind::SymbolKind(SymbolKind::Local),
+            hir::ScopeDef::Label(..) => CompletionItemKind::SymbolKind(SymbolKind::Label),
+            hir::ScopeDef::AdtSelfType(..) | hir::ScopeDef::ImplSelfType(..) => {
                 CompletionItemKind::SymbolKind(SymbolKind::SelfParam)
             }
-            ScopeDef::Unknown => {
+            hir::ScopeDef::Unknown => {
                 let mut item = CompletionItem::new(
                     CompletionKind::Reference,
                     self.ctx.source_range(),
-                    local_name,
+                    local_name.to_string(),
                 );
                 item.kind(CompletionItemKind::UnresolvedReference).add_import(import_to_add);
                 return Some(item.build());
             }
         };
 
+        let local_name = local_name.to_string();
         let mut item =
             CompletionItem::new(completion_kind, self.ctx.source_range(), local_name.clone());
-        if let ScopeDef::Local(local) = resolution {
+        if let hir::ScopeDef::Local(local) = resolution {
             let ty = local.ty(self.ctx.db());
             if !ty.is_unknown() {
                 item.detail(ty.display(self.ctx.db()).to_string());
@@ -260,8 +265,10 @@ impl<'a> Render<'a> {
         {
             if let Some(cap) = self.ctx.snippet_cap() {
                 let has_non_default_type_params = match resolution {
-                    ScopeDef::ModuleDef(Adt(it)) => it.has_non_default_type_params(self.ctx.db()),
-                    ScopeDef::ModuleDef(TypeAlias(it)) => {
+                    hir::ScopeDef::ModuleDef(Adt(it)) => {
+                        it.has_non_default_type_params(self.ctx.db())
+                    }
+                    hir::ScopeDef::ModuleDef(TypeAlias(it)) => {
                         it.has_non_default_type_params(self.ctx.db())
                     }
                     _ => false,
@@ -281,26 +288,26 @@ impl<'a> Render<'a> {
         Some(item.build())
     }
 
-    fn docs(&self, resolution: &ScopeDef) -> Option<Documentation> {
+    fn docs(&self, resolution: &hir::ScopeDef) -> Option<hir::Documentation> {
         use hir::ModuleDef::*;
         match resolution {
-            ScopeDef::ModuleDef(Module(it)) => it.docs(self.ctx.db()),
-            ScopeDef::ModuleDef(Adt(it)) => it.docs(self.ctx.db()),
-            ScopeDef::ModuleDef(Variant(it)) => it.docs(self.ctx.db()),
-            ScopeDef::ModuleDef(Const(it)) => it.docs(self.ctx.db()),
-            ScopeDef::ModuleDef(Static(it)) => it.docs(self.ctx.db()),
-            ScopeDef::ModuleDef(Trait(it)) => it.docs(self.ctx.db()),
-            ScopeDef::ModuleDef(TypeAlias(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(Module(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(Adt(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(Variant(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(Const(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(Static(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(Trait(it)) => it.docs(self.ctx.db()),
+            hir::ScopeDef::ModuleDef(TypeAlias(it)) => it.docs(self.ctx.db()),
             _ => None,
         }
     }
 
-    fn is_deprecated(&self, resolution: &ScopeDef) -> bool {
+    fn is_deprecated(&self, resolution: &hir::ScopeDef) -> bool {
         match resolution {
-            ScopeDef::ModuleDef(it) => self.ctx.is_deprecated_assoc_item(*it),
-            ScopeDef::MacroDef(it) => self.ctx.is_deprecated(*it),
-            ScopeDef::GenericParam(it) => self.ctx.is_deprecated(*it),
-            ScopeDef::AdtSelfType(it) => self.ctx.is_deprecated(*it),
+            hir::ScopeDef::ModuleDef(it) => self.ctx.is_deprecated_assoc_item(*it),
+            hir::ScopeDef::MacroDef(it) => self.ctx.is_deprecated(*it),
+            hir::ScopeDef::GenericParam(it) => self.ctx.is_deprecated(*it),
+            hir::ScopeDef::AdtSelfType(it) => self.ctx.is_deprecated(*it),
             _ => false,
         }
     }
@@ -327,21 +334,23 @@ fn compute_type_match(
     }
 }
 
-fn compute_exact_name_match(ctx: &CompletionContext, completion_name: impl Into<String>) -> bool {
-    let completion_name = completion_name.into();
+fn compute_exact_name_match(ctx: &CompletionContext, completion_name: &str) -> bool {
     ctx.expected_name.as_ref().map_or(false, |name| name.text() == completion_name)
 }
 
-fn compute_ref_match(ctx: &CompletionContext, completion_ty: &hir::Type) -> Option<Mutability> {
+fn compute_ref_match(
+    ctx: &CompletionContext,
+    completion_ty: &hir::Type,
+) -> Option<hir::Mutability> {
     let expected_type = ctx.expected_type.as_ref()?;
     if completion_ty != expected_type {
         let expected_type_without_ref = expected_type.remove_ref()?;
         if completion_ty.autoderef(ctx.db).any(|deref_ty| deref_ty == expected_type_without_ref) {
             cov_mark::hit!(suggest_ref);
             let mutability = if expected_type.is_mutable_reference() {
-                Mutability::Mut
+                hir::Mutability::Mut
             } else {
-                Mutability::Shared
+                hir::Mutability::Shared
             };
             return Some(mutability);
         };
diff --git a/crates/ide_completion/src/render/enum_variant.rs b/crates/ide_completion/src/render/enum_variant.rs
index 0c0c71134..28f056e77 100644
--- a/crates/ide_completion/src/render/enum_variant.rs
+++ b/crates/ide_completion/src/render/enum_variant.rs
@@ -1,6 +1,8 @@
 //! Renderer for `enum` variants.
 
-use hir::{HasAttrs, HirDisplay, ModPath, StructKind};
+use std::iter;
+
+use hir::{HasAttrs, HirDisplay};
 use ide_db::SymbolKind;
 use itertools::Itertools;
 
@@ -13,9 +15,9 @@ use crate::{
 pub(crate) fn render_variant<'a>(
     ctx: RenderContext<'a>,
     import_to_add: Option<ImportEdit>,
-    local_name: Option<String>,
+    local_name: Option<hir::Name>,
     variant: hir::Variant,
-    path: Option<ModPath>,
+    path: Option<hir::ModPath>,
 ) -> CompletionItem {
     let _p = profile::span("render_enum_variant");
     EnumRender::new(ctx, local_name, variant, path).render(import_to_add)
@@ -24,42 +26,45 @@ pub(crate) fn render_variant<'a>(
 #[derive(Debug)]
 struct EnumRender<'a> {
     ctx: RenderContext<'a>,
-    name: String,
+    name: hir::Name,
     variant: hir::Variant,
-    path: Option<ModPath>,
-    qualified_name: String,
-    short_qualified_name: String,
-    variant_kind: StructKind,
+    path: Option<hir::ModPath>,
+    qualified_name: hir::ModPath,
+    short_qualified_name: hir::ModPath,
+    variant_kind: hir::StructKind,
 }
 
 impl<'a> EnumRender<'a> {
     fn new(
         ctx: RenderContext<'a>,
-        local_name: Option<String>,
+        local_name: Option<hir::Name>,
         variant: hir::Variant,
-        path: Option<ModPath>,
+        path: Option<hir::ModPath>,
     ) -> EnumRender<'a> {
-        let name = local_name.unwrap_or_else(|| variant.name(ctx.db()).to_string());
+        let name = local_name.unwrap_or_else(|| variant.name(ctx.db()));
         let variant_kind = variant.kind(ctx.db());
 
         let (qualified_name, short_qualified_name) = match &path {
             Some(path) => {
-                let full = path.to_string();
-                let segments = path.segments();
-                let short = segments[segments.len().saturating_sub(2)..].iter().join("::");
-                (full, short)
+                let short = hir::ModPath::from_segments(
+                    hir::PathKind::Plain,
+                    path.segments().iter().skip(path.segments().len().saturating_sub(2)).cloned(),
+                );
+                (path.clone(), short)
             }
-            None => (name.to_string(), name.to_string()),
+            None => (
+                hir::ModPath::from_segments(hir::PathKind::Plain, iter::once(name.clone())),
+                hir::ModPath::from_segments(hir::PathKind::Plain, iter::once(name.clone())),
+            ),
         };
 
         EnumRender { ctx, name, variant, path, qualified_name, short_qualified_name, variant_kind }
     }
-
     fn render(self, import_to_add: Option<ImportEdit>) -> CompletionItem {
         let mut item = CompletionItem::new(
             CompletionKind::Reference,
             self.ctx.source_range(),
-            self.qualified_name.clone(),
+            self.qualified_name.to_string(),
         );
         item.kind(SymbolKind::Variant)
             .set_documentation(self.variant.docs(self.ctx.db()))
@@ -67,12 +72,16 @@ impl<'a> EnumRender<'a> {
             .add_import(import_to_add)
             .detail(self.detail());
 
-        if self.variant_kind == StructKind::Tuple {
+        if self.variant_kind == hir::StructKind::Tuple {
             cov_mark::hit!(inserts_parens_for_tuple_enums);
             let params = Params::Anonymous(self.variant.fields(self.ctx.db()).len());
-            item.add_call_parens(self.ctx.completion, self.short_qualified_name, params);
+            item.add_call_parens(
+                self.ctx.completion,
+                self.short_qualified_name.to_string(),
+                params,
+            );
         } else if self.path.is_some() {
-            item.lookup_by(self.short_qualified_name);
+            item.lookup_by(self.short_qualified_name.to_string());
         }
 
         let ty = self.variant.parent_enum(self.ctx.completion.db).ty(self.ctx.completion.db);
@@ -96,11 +105,11 @@ impl<'a> EnumRender<'a> {
             .map(|field| (field.name(self.ctx.db()), field.ty(self.ctx.db())));
 
         match self.variant_kind {
-            StructKind::Tuple | StructKind::Unit => format!(
+            hir::StructKind::Tuple | hir::StructKind::Unit => format!(
                 "({})",
                 detail_types.map(|(_, t)| t.display(self.ctx.db()).to_string()).format(", ")
             ),
-            StructKind::Record => format!(
+            hir::StructKind::Record => format!(
                 "{{ {} }}",
                 detail_types
                     .map(|(n, t)| format!("{}: {}", n, t.display(self.ctx.db()).to_string()))
diff --git a/crates/ide_completion/src/render/function.rs b/crates/ide_completion/src/render/function.rs
index d681e2c91..63bd66926 100644
--- a/crates/ide_completion/src/render/function.rs
+++ b/crates/ide_completion/src/render/function.rs
@@ -1,6 +1,6 @@
 //! Renderer for function calls.
 
-use hir::{HasSource, HirDisplay, Type};
+use hir::{HasSource, HirDisplay};
 use ide_db::SymbolKind;
 use itertools::Itertools;
 use syntax::ast::Fn;
@@ -16,7 +16,7 @@ use crate::{
 pub(crate) fn render_fn<'a>(
     ctx: RenderContext<'a>,
     import_to_add: Option<ImportEdit>,
-    local_name: Option<String>,
+    local_name: Option<hir::Name>,
     fn_: hir::Function,
 ) -> Option<CompletionItem> {
     let _p = profile::span("render_fn");
@@ -26,7 +26,7 @@ pub(crate) fn render_fn<'a>(
 pub(crate) fn render_method<'a>(
     ctx: RenderContext<'a>,
     import_to_add: Option<ImportEdit>,
-    local_name: Option<String>,
+    local_name: Option<hir::Name>,
     fn_: hir::Function,
 ) -> Option<CompletionItem> {
     let _p = profile::span("render_method");
@@ -45,11 +45,11 @@ struct FunctionRender<'a> {
 impl<'a> FunctionRender<'a> {
     fn new(
         ctx: RenderContext<'a>,
-        local_name: Option<String>,
+        local_name: Option<hir::Name>,
         fn_: hir::Function,
         is_method: bool,
     ) -> Option<FunctionRender<'a>> {
-        let name = local_name.unwrap_or_else(|| fn_.name(ctx.db()).to_string());
+        let name = local_name.unwrap_or_else(|| fn_.name(ctx.db())).to_string();
         let ast_node = fn_.source(ctx.db())?.value;
 
         Some(FunctionRender { ctx, name, func: fn_, ast_node, is_method })
@@ -74,7 +74,7 @@ impl<'a> FunctionRender<'a> {
         let ret_type = self.func.ret_type(self.ctx.db());
         item.set_relevance(CompletionRelevance {
             type_match: compute_type_match(self.ctx.completion, &ret_type),
-            exact_name_match: compute_exact_name_match(self.ctx.completion, self.name.clone()),
+            exact_name_match: compute_exact_name_match(self.ctx.completion, &self.name),
             ..CompletionRelevance::default()
         });
 
@@ -129,7 +129,7 @@ impl<'a> FunctionRender<'a> {
         format!("-> {}", ret_ty.display(self.ctx.db()))
     }
 
-    fn add_arg(&self, arg: &str, ty: &Type) -> String {
+    fn add_arg(&self, arg: &str, ty: &hir::Type) -> String {
         if let Some(derefed_ty) = ty.remove_ref() {
             for (name, local) in self.ctx.completion.locals.iter() {
                 if name == arg && local.ty(self.ctx.db()) == derefed_ty {
diff --git a/crates/ide_completion/src/render/macro_.rs b/crates/ide_completion/src/render/macro_.rs
index b90fd3890..0dfba8acc 100644
--- a/crates/ide_completion/src/render/macro_.rs
+++ b/crates/ide_completion/src/render/macro_.rs
@@ -1,6 +1,6 @@
 //! Renderer for macro invocations.
 
-use hir::{Documentation, HasSource};
+use hir::HasSource;
 use ide_db::SymbolKind;
 use syntax::display::macro_label;
 
@@ -12,7 +12,7 @@ use crate::{
 pub(crate) fn render_macro<'a>(
     ctx: RenderContext<'a>,
     import_to_add: Option<ImportEdit>,
-    name: String,
+    name: hir::Name,
     macro_: hir::MacroDef,
 ) -> Option<CompletionItem> {
     let _p = profile::span("render_macro");
@@ -24,13 +24,14 @@ struct MacroRender<'a> {
     ctx: RenderContext<'a>,
     name: String,
     macro_: hir::MacroDef,
-    docs: Option<Documentation>,
+    docs: Option<hir::Documentation>,
     bra: &'static str,
     ket: &'static str,
 }
 
 impl<'a> MacroRender<'a> {
-    fn new(ctx: RenderContext<'a>, name: String, macro_: hir::MacroDef) -> MacroRender<'a> {
+    fn new(ctx: RenderContext<'a>, name: hir::Name, macro_: hir::MacroDef) -> MacroRender<'a> {
+        let name = name.to_string();
         let docs = ctx.docs(macro_);
         let docs_str = docs.as_ref().map_or("", |s| s.as_str());
         let (bra, ket) = guess_macro_braces(&name, docs_str);