5 files changed, 43 insertions, 57 deletions

diff --git a/crates/ra_hir/src/adt.rs b/crates/ra_hir/src/adt.rs
index 6cdaa1888..e839a5a90 100644
--- a/crates/ra_hir/src/adt.rs
+++ b/crates/ra_hir/src/adt.rs
@@ -1,10 +1,10 @@
 use std::sync::Arc;
 
-use ra_syntax::{SmolStr, ast::{self, NameOwner, StructFlavor}};
+use ra_syntax::ast::{self, NameOwner, StructFlavor};
 
 use crate::{
-    DefId, Cancelable,
-    db::{HirDatabase},
+    DefId, Cancelable, Name, AsName,
+    db::HirDatabase,
     type_ref::TypeRef,
 };
 
@@ -29,26 +29,26 @@ impl Struct {
         Ok(db.struct_data(self.def_id)?)
     }
 
-    pub fn name(&self, db: &impl HirDatabase) -> Cancelable<Option<SmolStr>> {
+    pub fn name(&self, db: &impl HirDatabase) -> Cancelable<Option<Name>> {
         Ok(db.struct_data(self.def_id)?.name.clone())
     }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct StructData {
-    name: Option<SmolStr>,
+    name: Option<Name>,
     variant_data: Arc<VariantData>,
 }
 
 impl StructData {
     pub(crate) fn new(struct_def: ast::StructDef) -> StructData {
-        let name = struct_def.name().map(|n| n.text());
+        let name = struct_def.name().map(|n| n.as_name());
         let variant_data = VariantData::new(struct_def.flavor());
         let variant_data = Arc::new(variant_data);
         StructData { name, variant_data }
     }
 
-    pub fn name(&self) -> Option<&SmolStr> {
+    pub fn name(&self) -> Option<&Name> {
         self.name.as_ref()
     }
 
@@ -70,31 +70,29 @@ impl Enum {
         self.def_id
     }
 
-    pub fn name(&self, db: &impl HirDatabase) -> Cancelable<Option<SmolStr>> {
+    pub fn name(&self, db: &impl HirDatabase) -> Cancelable<Option<Name>> {
         Ok(db.enum_data(self.def_id)?.name.clone())
     }
 
-    pub fn variants(&self, db: &impl HirDatabase) -> Cancelable<Vec<(SmolStr, Arc<VariantData>)>> {
+    pub fn variants(&self, db: &impl HirDatabase) -> Cancelable<Vec<(Name, Arc<VariantData>)>> {
         Ok(db.enum_data(self.def_id)?.variants.clone())
     }
 }
 
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct EnumData {
-    name: Option<SmolStr>,
-    variants: Vec<(SmolStr, Arc<VariantData>)>,
+    name: Option<Name>,
+    variants: Vec<(Name, Arc<VariantData>)>,
 }
 
 impl EnumData {
     pub(crate) fn new(enum_def: ast::EnumDef) -> Self {
-        let name = enum_def.name().map(|n| n.text());
+        let name = enum_def.name().map(|n| n.as_name());
         let variants = if let Some(evl) = enum_def.variant_list() {
             evl.variants()
                 .map(|v| {
                     (
-                        v.name()
-                            .map(|n| n.text())
-                            .unwrap_or_else(|| SmolStr::new("[error]")),
+                        v.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
                         Arc::new(VariantData::new(v.flavor())),
                     )
                 })
@@ -109,12 +107,12 @@ impl EnumData {
 /// A single field of an enum variant or struct
 #[derive(Debug, Clone, PartialEq, Eq)]
 pub struct StructField {
-    name: SmolStr,
+    name: Name,
     type_ref: TypeRef,
 }
 
 impl StructField {
-    pub fn name(&self) -> SmolStr {
+    pub fn name(&self) -> Name {
         self.name.clone()
     }
     pub fn type_ref(&self) -> &TypeRef {
@@ -138,7 +136,7 @@ impl VariantData {
                     .fields()
                     .enumerate()
                     .map(|(i, fd)| StructField {
-                        name: SmolStr::new(i.to_string()),
+                        name: Name::tuple_field_name(i),
                         type_ref: TypeRef::from_ast_opt(fd.type_ref()),
                     })
                     .collect();
@@ -148,10 +146,7 @@ impl VariantData {
                 let fields = fl
                     .fields()
                     .map(|fd| StructField {
-                        name: fd
-                            .name()
-                            .map(|n| n.text())
-                            .unwrap_or_else(|| SmolStr::new("[error]")),
+                        name: fd.name().map(|n| n.as_name()).unwrap_or_else(Name::missing),
                         type_ref: TypeRef::from_ast_opt(fd.type_ref()),
                     })
                     .collect();
@@ -161,10 +156,10 @@ impl VariantData {
         }
     }
 
-    pub(crate) fn get_field_type_ref(&self, field_name: &str) -> Option<&TypeRef> {
+    pub(crate) fn get_field_type_ref(&self, field_name: &Name) -> Option<&TypeRef> {
         self.fields()
             .iter()
-            .find(|f| f.name == field_name)
+            .find(|f| f.name == *field_name)
             .map(|f| &f.type_ref)
     }
 
diff --git a/crates/ra_hir/src/db.rs b/crates/ra_hir/src/db.rs
index ba43a4502..b41a7429a 100644
--- a/crates/ra_hir/src/db.rs
+++ b/crates/ra_hir/src/db.rs
@@ -1,13 +1,10 @@
 use std::sync::Arc;
 
-use ra_syntax::{
-    SmolStr,
-    SyntaxNode,
-};
+use ra_syntax::SyntaxNode;
 use ra_db::{SourceRootId, LocationIntener, SyntaxDatabase, FileId, Cancelable};
 
 use crate::{
-    DefLoc, DefId,
+    DefLoc, DefId, Name,
     SourceFileItems, SourceItemId,
     query_definitions,
     FnScopes,
@@ -47,7 +44,7 @@ pub trait HirDatabase: SyntaxDatabase
         use fn query_definitions::type_for_def;
     }
 
-    fn type_for_field(def_id: DefId, field: SmolStr) -> Cancelable<Ty> {
+    fn type_for_field(def_id: DefId, field: Name) -> Cancelable<Ty> {
         type TypeForFieldQuery;
         use fn query_definitions::type_for_field;
     }
diff --git a/crates/ra_hir/src/name.rs b/crates/ra_hir/src/name.rs
index e4fc141a6..51e8b3da8 100644
--- a/crates/ra_hir/src/name.rs
+++ b/crates/ra_hir/src/name.rs
@@ -23,6 +23,18 @@ impl fmt::Debug for Name {
 }
 
 impl Name {
+    fn new(text: SmolStr) -> Name {
+        Name { text }
+    }
+
+    pub(crate) fn missing() -> Name {
+        Name::new("[missing name]".into())
+    }
+
+    pub(crate) fn tuple_field_name(idx: usize) -> Name {
+        Name::new(idx.to_string().into())
+    }
+
     pub(crate) fn as_known_name(&self) -> Option<KnownName> {
         let name = match self.text.as_str() {
             "isize" => KnownName::Isize,
@@ -43,10 +55,6 @@ impl Name {
         };
         Some(name)
     }
-
-    fn new(text: SmolStr) -> Name {
-        Name { text }
-    }
 }
 
 pub(crate) trait AsName {
diff --git a/crates/ra_hir/src/query_definitions.rs b/crates/ra_hir/src/query_definitions.rs
index 56e3f7e9d..016d86ee6 100644
--- a/crates/ra_hir/src/query_definitions.rs
+++ b/crates/ra_hir/src/query_definitions.rs
@@ -5,7 +5,7 @@ use std::{
 
 use rustc_hash::FxHashMap;
 use ra_syntax::{
-    AstNode, SyntaxNode, SmolStr,
+    AstNode, SyntaxNode,
     ast::{self, NameOwner, ModuleItemOwner}
 };
 use ra_db::{SourceRootId, FileId, Cancelable,};
@@ -39,11 +39,7 @@ pub(super) fn type_for_def(db: &impl HirDatabase, def_id: DefId) -> Cancelable<T
     ty::type_for_def(db, def_id)
 }
 
-pub(super) fn type_for_field(
-    db: &impl HirDatabase,
-    def_id: DefId,
-    field: SmolStr,
-) -> Cancelable<Ty> {
+pub(super) fn type_for_field(db: &impl HirDatabase, def_id: DefId, field: Name) -> Cancelable<Ty> {
     ty::type_for_field(db, def_id, field)
 }
 
diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index ad097d1f1..38720b7b5 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -10,13 +10,12 @@ use rustc_hash::{FxHashMap};
 
 use ra_db::{LocalSyntaxPtr, Cancelable};
 use ra_syntax::{
-    SmolStr,
     ast::{self, AstNode, LoopBodyOwner, ArgListOwner, PrefixOp},
     SyntaxNodeRef
 };
 
 use crate::{
-    Def, DefId, FnScopes, Module, Function, Struct, Enum, Path,
+    Def, DefId, FnScopes, Module, Function, Struct, Enum, Path, Name, AsName,
     db::HirDatabase,
     adt::VariantData,
     type_ref::{TypeRef, Mutability},
@@ -45,7 +44,7 @@ pub enum Ty {
         /// The DefId of the struct/enum.
         def_id: DefId,
         /// The name, for displaying.
-        name: SmolStr,
+        name: Name,
         // later we'll need generic substitutions here
     },
 
@@ -276,18 +275,14 @@ pub fn type_for_fn(db: &impl HirDatabase, f: Function) -> Cancelable<Ty> {
 pub fn type_for_struct(db: &impl HirDatabase, s: Struct) -> Cancelable<Ty> {
     Ok(Ty::Adt {
         def_id: s.def_id(),
-        name: s
-            .name(db)?
-            .unwrap_or_else(|| SmolStr::new("[unnamed struct]")),
+        name: s.name(db)?.unwrap_or_else(Name::missing),
     })
 }
 
 pub fn type_for_enum(db: &impl HirDatabase, s: Enum) -> Cancelable<Ty> {
     Ok(Ty::Adt {
         def_id: s.def_id(),
-        name: s
-            .name(db)?
-            .unwrap_or_else(|| SmolStr::new("[unnamed enum]")),
+        name: s.name(db)?.unwrap_or_else(Name::missing),
     })
 }
 
@@ -308,11 +303,7 @@ pub fn type_for_def(db: &impl HirDatabase, def_id: DefId) -> Cancelable<Ty> {
     }
 }
 
-pub(super) fn type_for_field(
-    db: &impl HirDatabase,
-    def_id: DefId,
-    field: SmolStr,
-) -> Cancelable<Ty> {
+pub(super) fn type_for_field(db: &impl HirDatabase, def_id: DefId, field: Name) -> Cancelable<Ty> {
     let def = def_id.resolve(db)?;
     let variant_data = match def {
         Def::Struct(s) => {
@@ -559,14 +550,13 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             ast::Expr::FieldExpr(e) => {
                 let receiver_ty = self.infer_expr_opt(e.expr())?;
                 if let Some(nr) = e.name_ref() {
-                    let text = nr.text();
                     match receiver_ty {
                         Ty::Tuple(fields) => {
-                            let i = text.parse::<usize>().ok();
+                            let i = nr.text().parse::<usize>().ok();
                             i.and_then(|i| fields.get(i).cloned())
                                 .unwrap_or(Ty::Unknown)
                         }
-                        Ty::Adt { def_id, .. } => self.db.type_for_field(def_id, text)?,
+                        Ty::Adt { def_id, .. } => self.db.type_for_field(def_id, nr.as_name())?,
                         _ => Ty::Unknown,
                     }
                 } else {