diff --git a/crates/ra_assists/src/fill_match_arms.rs b/crates/ra_assists/src/fill_match_arms.rs
index cc387956247b..543ed164c777 100644
--- a/crates/ra_assists/src/fill_match_arms.rs
+++ b/crates/ra_assists/src/fill_match_arms.rs
@@ -1,6 +1,6 @@
 use std::iter;
 
-use hir::{db::HirDatabase, AdtDef, HasSource};
+use hir::{db::HirDatabase, Adt, HasSource};
 use ra_syntax::ast::{self, AstNode, NameOwner};
 
 use crate::{ast_editor::AstBuilder, Assist, AssistCtx, AssistId};
@@ -60,7 +60,7 @@ fn resolve_enum_def(
     let expr_ty = analyzer.type_of(db, &expr)?;
 
     analyzer.autoderef(db, expr_ty).find_map(|ty| match ty.as_adt() {
-        Some((AdtDef::Enum(e), _)) => Some(e.source(db).ast),
+        Some((Adt::Enum(e), _)) => Some(e.source(db).ast),
         _ => None,
     })
 }
diff --git a/crates/ra_hir/src/adt.rs b/crates/ra_hir/src/adt.rs
index 728046b0d4a6..56f2b7aa36d3 100644
--- a/crates/ra_hir/src/adt.rs
+++ b/crates/ra_hir/src/adt.rs
@@ -9,29 +9,9 @@ use ra_syntax::ast::{self, NameOwner, StructKind, TypeAscriptionOwner};
 use crate::{
     db::{AstDatabase, DefDatabase, HirDatabase},
     type_ref::TypeRef,
-    AsName, Crate, Enum, EnumVariant, FieldSource, HasSource, Name, Source, Struct, StructField,
-    Union,
+    AsName, Enum, EnumVariant, FieldSource, HasSource, Name, Source, Struct, StructField,
 };
 
-#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
-pub enum AdtDef {
-    Struct(Struct),
-    Union(Union),
-    Enum(Enum),
-}
-impl_froms!(AdtDef: Struct, Union, Enum);
-
-impl AdtDef {
-    pub(crate) fn krate(self, db: &impl HirDatabase) -> Option<Crate> {
-        match self {
-            AdtDef::Struct(s) => s.module(db),
-            AdtDef::Union(s) => s.module(db),
-            AdtDef::Enum(e) => e.module(db),
-        }
-        .krate(db)
-    }
-}
-
 impl Struct {
     pub(crate) fn variant_data(self, db: &impl DefDatabase) -> Arc<VariantData> {
         db.struct_data(self).variant_data.clone()
diff --git a/crates/ra_hir/src/code_model.rs b/crates/ra_hir/src/code_model.rs
index 2bac6122bd65..c1938bd86704 100644
--- a/crates/ra_hir/src/code_model.rs
+++ b/crates/ra_hir/src/code_model.rs
@@ -127,9 +127,7 @@ impl BuiltinType {
 pub enum ModuleDef {
     Module(Module),
     Function(Function),
-    Struct(Struct),
-    Union(Union),
-    Enum(Enum),
+    Adt(Adt),
     // Can't be directly declared, but can be imported.
     EnumVariant(EnumVariant),
     Const(Const),
@@ -141,9 +139,7 @@ pub enum ModuleDef {
 impl_froms!(
     ModuleDef: Module,
     Function,
-    Struct,
-    Union,
-    Enum,
+    Adt(Struct, Enum, Union),
     EnumVariant,
     Const,
     Static,
@@ -500,6 +496,42 @@ impl EnumVariant {
     }
 }
 
+/// A Data Type
+#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
+pub enum Adt {
+    Struct(Struct),
+    Union(Union),
+    Enum(Enum),
+}
+impl_froms!(Adt: Struct, Union, Enum);
+
+impl Adt {
+    pub fn ty(self, db: &impl HirDatabase) -> Ty {
+        match self {
+            Adt::Struct(it) => it.ty(db),
+            Adt::Union(it) => it.ty(db),
+            Adt::Enum(it) => it.ty(db),
+        }
+    }
+
+    pub(crate) fn krate(self, db: &impl HirDatabase) -> Option<Crate> {
+        match self {
+            Adt::Struct(s) => s.module(db),
+            Adt::Union(s) => s.module(db),
+            Adt::Enum(e) => e.module(db),
+        }
+        .krate(db)
+    }
+
+    pub(crate) fn resolver(self, db: &impl HirDatabase) -> Resolver {
+        match self {
+            Adt::Struct(it) => it.resolver(db),
+            Adt::Union(it) => it.resolver(db),
+            Adt::Enum(it) => it.resolver(db),
+        }
+    }
+}
+
 /// The defs which have a body.
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
 pub enum DefWithBody {
diff --git a/crates/ra_hir/src/expr/validation.rs b/crates/ra_hir/src/expr/validation.rs
index c985dbdadfa1..030ec53a29d6 100644
--- a/crates/ra_hir/src/expr/validation.rs
+++ b/crates/ra_hir/src/expr/validation.rs
@@ -4,14 +4,13 @@ use ra_syntax::ast;
 use rustc_hash::FxHashSet;
 
 use crate::{
-    adt::AdtDef,
     db::HirDatabase,
     diagnostics::{DiagnosticSink, MissingFields, MissingOkInTailExpr},
     expr::AstPtr,
     name,
     path::{PathKind, PathSegment},
     ty::{ApplicationTy, InferenceResult, Ty, TypeCtor},
-    Function, Name, Path,
+    Adt, Function, Name, Path,
 };
 
 use super::{Expr, ExprId, RecordLitField};
@@ -59,7 +58,7 @@ impl<'a, 'b> ExprValidator<'a, 'b> {
         }
 
         let struct_def = match self.infer[id].as_adt() {
-            Some((AdtDef::Struct(s), _)) => s,
+            Some((Adt::Struct(s), _)) => s,
             _ => return,
         };
 
@@ -124,7 +123,7 @@ impl<'a, 'b> ExprValidator<'a, 'b> {
             _ => return,
         };
 
-        let std_result_ctor = TypeCtor::Adt(AdtDef::Enum(std_result_enum));
+        let std_result_ctor = TypeCtor::Adt(Adt::Enum(std_result_enum));
         let params = match &mismatch.expected {
             Ty::Apply(ApplicationTy { ctor, parameters }) if ctor == &std_result_ctor => parameters,
             _ => return,
diff --git a/crates/ra_hir/src/generics.rs b/crates/ra_hir/src/generics.rs
index c76df0698c4a..77fb76bfcc1c 100644
--- a/crates/ra_hir/src/generics.rs
+++ b/crates/ra_hir/src/generics.rs
@@ -12,8 +12,8 @@ use crate::{
     name::SELF_TYPE,
     path::Path,
     type_ref::{TypeBound, TypeRef},
-    AdtDef, AsName, Container, Enum, EnumVariant, Function, HasSource, ImplBlock, Name, Struct,
-    Trait, TypeAlias, Union,
+    Adt, AsName, Container, Enum, EnumVariant, Function, HasSource, ImplBlock, Name, Struct, Trait,
+    TypeAlias, Union,
 };
 
 /// Data about a generic parameter (to a function, struct, impl, ...).
@@ -47,9 +47,7 @@ pub struct WherePredicate {
 #[derive(Clone, Copy, PartialEq, Eq, Debug, Hash)]
 pub enum GenericDef {
     Function(Function),
-    Struct(Struct),
-    Union(Union),
-    Enum(Enum),
+    Adt(Adt),
     Trait(Trait),
     TypeAlias(TypeAlias),
     ImplBlock(ImplBlock),
@@ -57,7 +55,14 @@ pub enum GenericDef {
     // can, and this makes some code easier to write
     EnumVariant(EnumVariant),
 }
-impl_froms!(GenericDef: Function, Struct, Union, Enum, Trait, TypeAlias, ImplBlock, EnumVariant);
+impl_froms!(
+    GenericDef: Function,
+    Adt(Struct, Enum, Union),
+    Trait,
+    TypeAlias,
+    ImplBlock,
+    EnumVariant
+);
 
 impl GenericParams {
     pub(crate) fn generic_params_query(
@@ -69,10 +74,7 @@ impl GenericParams {
             GenericDef::Function(it) => it.container(db).map(GenericDef::from),
             GenericDef::TypeAlias(it) => it.container(db).map(GenericDef::from),
             GenericDef::EnumVariant(it) => Some(it.parent_enum(db).into()),
-            GenericDef::Struct(_)
-            | GenericDef::Union(_)
-            | GenericDef::Enum(_)
-            | GenericDef::Trait(_) => None,
+            GenericDef::Adt(_) | GenericDef::Trait(_) => None,
             GenericDef::ImplBlock(_) => None,
         };
         generics.parent_params = parent.map(|p| db.generic_params(p));
@@ -80,9 +82,9 @@ impl GenericParams {
         // FIXME: add `: Sized` bound for everything except for `Self` in traits
         match def {
             GenericDef::Function(it) => generics.fill(&it.source(db).ast, start),
-            GenericDef::Struct(it) => generics.fill(&it.source(db).ast, start),
-            GenericDef::Union(it) => generics.fill(&it.source(db).ast, start),
-            GenericDef::Enum(it) => generics.fill(&it.source(db).ast, start),
+            GenericDef::Adt(Adt::Struct(it)) => generics.fill(&it.source(db).ast, start),
+            GenericDef::Adt(Adt::Union(it)) => generics.fill(&it.source(db).ast, start),
+            GenericDef::Adt(Adt::Enum(it)) => generics.fill(&it.source(db).ast, start),
             GenericDef::Trait(it) => {
                 // traits get the Self type as an implicit first type parameter
                 generics.params.push(GenericParam { idx: start, name: SELF_TYPE, default: None });
@@ -186,9 +188,7 @@ impl GenericDef {
     pub(crate) fn resolver(&self, db: &impl HirDatabase) -> crate::Resolver {
         match self {
             GenericDef::Function(inner) => inner.resolver(db),
-            GenericDef::Struct(inner) => inner.resolver(db),
-            GenericDef::Union(inner) => inner.resolver(db),
-            GenericDef::Enum(inner) => inner.resolver(db),
+            GenericDef::Adt(adt) => adt.resolver(db),
             GenericDef::Trait(inner) => inner.resolver(db),
             GenericDef::TypeAlias(inner) => inner.resolver(db),
             GenericDef::ImplBlock(inner) => inner.resolver(db),
@@ -206,16 +206,6 @@ impl From<Container> for GenericDef {
     }
 }
 
-impl From<crate::adt::AdtDef> for GenericDef {
-    fn from(adt: crate::adt::AdtDef) -> Self {
-        match adt {
-            AdtDef::Struct(s) => s.into(),
-            AdtDef::Union(u) => u.into(),
-            AdtDef::Enum(e) => e.into(),
-        }
-    }
-}
-
 pub trait HasGenericParams: Copy {
     fn generic_params(self, db: &impl DefDatabase) -> Arc<GenericParams>;
 }
diff --git a/crates/ra_hir/src/lang_item.rs b/crates/ra_hir/src/lang_item.rs
index 832fdf1f5765..e3b71cec3186 100644
--- a/crates/ra_hir/src/lang_item.rs
+++ b/crates/ra_hir/src/lang_item.rs
@@ -5,7 +5,7 @@ use ra_syntax::{ast::AttrsOwner, SmolStr};
 
 use crate::{
     db::{AstDatabase, DefDatabase, HirDatabase},
-    Crate, Enum, Function, HasSource, ImplBlock, Module, ModuleDef, Static, Struct, Trait,
+    Adt, Crate, Enum, Function, HasSource, ImplBlock, Module, ModuleDef, Static, Struct, Trait,
 };
 
 #[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
@@ -107,8 +107,10 @@ impl LangItems {
                 ModuleDef::Trait(trait_) => {
                     self.collect_lang_item(db, trait_, LangItemTarget::Trait)
                 }
-                ModuleDef::Enum(e) => self.collect_lang_item(db, e, LangItemTarget::Enum),
-                ModuleDef::Struct(s) => self.collect_lang_item(db, s, LangItemTarget::Struct),
+                ModuleDef::Adt(Adt::Enum(e)) => self.collect_lang_item(db, e, LangItemTarget::Enum),
+                ModuleDef::Adt(Adt::Struct(s)) => {
+                    self.collect_lang_item(db, s, LangItemTarget::Struct)
+                }
                 ModuleDef::Function(f) => self.collect_lang_item(db, f, LangItemTarget::Function),
                 ModuleDef::Static(s) => self.collect_lang_item(db, s, LangItemTarget::Static),
                 _ => {}
diff --git a/crates/ra_hir/src/lib.rs b/crates/ra_hir/src/lib.rs
index 24ee84f86a7f..508da362315d 100644
--- a/crates/ra_hir/src/lib.rs
+++ b/crates/ra_hir/src/lib.rs
@@ -8,13 +8,20 @@
 //! applied. So, the relation between syntax and HIR is many-to-one.
 
 macro_rules! impl_froms {
-    ($e:ident: $($v:ident),*) => {
+    ($e:ident: $($v:ident $(($($sv:ident),*))?),*) => {
         $(
             impl From<$v> for $e {
                 fn from(it: $v) -> $e {
                     $e::$v(it)
                 }
             }
+            $($(
+                impl From<$sv> for $e {
+                    fn from(it: $sv) -> $e {
+                        $e::$v($v::$sv(it))
+                    }
+                }
+            )*)?
         )*
     }
 }
@@ -57,7 +64,7 @@ use crate::{
 };
 
 pub use self::{
-    adt::{AdtDef, VariantDef},
+    adt::VariantDef,
     either::Either,
     expr::ExprScopes,
     generics::{GenericParam, GenericParams, HasGenericParams},
@@ -78,7 +85,7 @@ pub use self::{
 pub use self::code_model::{
     docs::{DocDef, Docs, Documentation},
     src::{HasBodySource, HasSource, Source},
-    BuiltinType, Const, ConstData, Container, Crate, CrateDependency, DefWithBody, Enum,
+    Adt, BuiltinType, Const, ConstData, Container, Crate, CrateDependency, DefWithBody, Enum,
     EnumVariant, FieldSource, FnData, Function, HasBody, MacroDef, Module, ModuleDef, ModuleSource,
     Static, Struct, StructField, Trait, TypeAlias, Union,
 };
diff --git a/crates/ra_hir/src/nameres.rs b/crates/ra_hir/src/nameres.rs
index 3d8691f535ef..3a3bf6b5f70b 100644
--- a/crates/ra_hir/src/nameres.rs
+++ b/crates/ra_hir/src/nameres.rs
@@ -69,7 +69,8 @@ use crate::{
     diagnostics::DiagnosticSink,
     ids::MacroDefId,
     nameres::diagnostics::DefDiagnostic,
-    AstId, BuiltinType, Crate, HirFileId, MacroDef, Module, ModuleDef, Name, Path, PathKind, Trait,
+    Adt, AstId, BuiltinType, Crate, HirFileId, MacroDef, Module, ModuleDef, Name, Path, PathKind,
+    Trait,
 };
 
 pub(crate) use self::raw::{ImportSourceMap, RawItems};
@@ -425,7 +426,7 @@ impl CrateDefMap {
                         }
                     }
                 }
-                ModuleDef::Enum(e) => {
+                ModuleDef::Adt(Adt::Enum(e)) => {
                     // enum variant
                     tested_by!(can_import_enum_variant);
                     match e.variant(db, &segment.name) {
diff --git a/crates/ra_hir/src/nameres/collector.rs b/crates/ra_hir/src/nameres/collector.rs
index 03fbbd33f8bb..7d2f313c1d4e 100644
--- a/crates/ra_hir/src/nameres/collector.rs
+++ b/crates/ra_hir/src/nameres/collector.rs
@@ -13,7 +13,7 @@ use crate::{
         raw, Crate, CrateDefMap, CrateModuleId, ModuleData, ModuleDef, PerNs, ReachedFixedPoint,
         Resolution, ResolveMode,
     },
-    AstId, Const, Enum, Function, HirFileId, MacroDef, Module, Name, Path, PathKind, Static,
+    Adt, AstId, Const, Enum, Function, HirFileId, MacroDef, Module, Name, Path, PathKind, Static,
     Struct, Trait, TypeAlias, Union,
 };
 
@@ -314,7 +314,7 @@ where
                             .push((module_id, import_id));
                     }
                 }
-                Some(ModuleDef::Enum(e)) => {
+                Some(ModuleDef::Adt(Adt::Enum(e))) => {
                     tested_by!(glob_enum);
                     // glob import from enum => just import all the variants
                     let variants = e.variants(self.db);
diff --git a/crates/ra_hir/src/resolve.rs b/crates/ra_hir/src/resolve.rs
index 1ed150f5a3de..a77a9aeb19af 100644
--- a/crates/ra_hir/src/resolve.rs
+++ b/crates/ra_hir/src/resolve.rs
@@ -15,7 +15,7 @@ use crate::{
     name::{Name, SELF_PARAM, SELF_TYPE},
     nameres::{CrateDefMap, CrateModuleId, PerNs},
     path::Path,
-    Enum, MacroDef, ModuleDef, Struct, Trait,
+    Adt, Enum, MacroDef, ModuleDef, Struct, Trait,
 };
 
 #[derive(Debug, Clone, Default)]
@@ -143,7 +143,7 @@ impl Resolver {
     ) -> Option<Struct> {
         let res = self.resolve_path_segments(db, path).into_fully_resolved().take_types()?;
         match res {
-            Resolution::Def(ModuleDef::Struct(it)) => Some(it),
+            Resolution::Def(ModuleDef::Adt(Adt::Struct(it))) => Some(it),
             _ => None,
         }
     }
@@ -152,7 +152,7 @@ impl Resolver {
     pub(crate) fn resolve_known_enum(&self, db: &impl HirDatabase, path: &Path) -> Option<Enum> {
         let res = self.resolve_path_segments(db, path).into_fully_resolved().take_types()?;
         match res {
-            Resolution::Def(ModuleDef::Enum(it)) => Some(it),
+            Resolution::Def(ModuleDef::Adt(Adt::Enum(it))) => Some(it),
             _ => None,
         }
     }
diff --git a/crates/ra_hir/src/ty.rs b/crates/ra_hir/src/ty.rs
index a3df08827836..375850b92ee0 100644
--- a/crates/ra_hir/src/ty.rs
+++ b/crates/ra_hir/src/ty.rs
@@ -16,7 +16,7 @@ use std::ops::Deref;
 use std::sync::Arc;
 use std::{fmt, mem};
 
-use crate::{db::HirDatabase, type_ref::Mutability, AdtDef, GenericParams, Name, Trait, TypeAlias};
+use crate::{db::HirDatabase, type_ref::Mutability, Adt, GenericParams, Name, Trait, TypeAlias};
 use display::{HirDisplay, HirFormatter};
 
 pub(crate) use autoderef::autoderef;
@@ -47,7 +47,7 @@ pub enum TypeCtor {
     Float(primitive::UncertainFloatTy),
 
     /// Structures, enumerations and unions.
-    Adt(AdtDef),
+    Adt(Adt),
 
     /// The pointee of a string slice. Written as `str`.
     Str,
@@ -458,7 +458,7 @@ impl Ty {
         }
     }
 
-    pub fn as_adt(&self) -> Option<(AdtDef, &Substs)> {
+    pub fn as_adt(&self) -> Option<(Adt, &Substs)> {
         match self {
             Ty::Apply(ApplicationTy { ctor: TypeCtor::Adt(adt_def), parameters }) => {
                 Some((*adt_def, parameters))
@@ -726,9 +726,9 @@ impl HirDisplay for ApplicationTy {
             }
             TypeCtor::Adt(def_id) => {
                 let name = match def_id {
-                    AdtDef::Struct(s) => s.name(f.db),
-                    AdtDef::Union(u) => u.name(f.db),
-                    AdtDef::Enum(e) => e.name(f.db),
+                    Adt::Struct(s) => s.name(f.db),
+                    Adt::Union(u) => u.name(f.db),
+                    Adt::Enum(e) => e.name(f.db),
                 }
                 .unwrap_or_else(Name::missing);
                 write!(f, "{}", name)?;
diff --git a/crates/ra_hir/src/ty/infer.rs b/crates/ra_hir/src/ty/infer.rs
index 3970c49e32e0..540a99b152b1 100644
--- a/crates/ra_hir/src/ty/infer.rs
+++ b/crates/ra_hir/src/ty/infer.rs
@@ -48,7 +48,7 @@ use crate::{
     resolve::{Resolution, Resolver},
     ty::infer::diagnostics::InferenceDiagnostic,
     type_ref::{Mutability, TypeRef},
-    AdtDef, ConstData, DefWithBody, FnData, Function, HasBody, ImplItem, ModuleDef, Name, Path,
+    Adt, ConstData, DefWithBody, FnData, Function, HasBody, ImplItem, ModuleDef, Name, Path,
     StructField,
 };
 
@@ -668,7 +668,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         // FIXME remove the duplication between here and `Ty::from_path`?
         let substs = Ty::substs_from_path(self.db, resolver, path, def);
         match def {
-            TypableDef::Struct(s) => {
+            TypableDef::Adt(Adt::Struct(s)) => {
                 let ty = s.ty(self.db);
                 let ty = self.insert_type_vars(ty.apply_substs(substs));
                 (ty, Some(s.into()))
@@ -678,10 +678,10 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                 let ty = self.insert_type_vars(ty.apply_substs(substs));
                 (ty, Some(var.into()))
             }
-            TypableDef::Union(_)
+            TypableDef::Adt(Adt::Enum(_))
+            | TypableDef::Adt(Adt::Union(_))
             | TypableDef::TypeAlias(_)
             | TypableDef::Function(_)
-            | TypableDef::Enum(_)
             | TypableDef::Const(_)
             | TypableDef::Static(_)
             | TypableDef::BuiltinType(_) => (Ty::Unknown, None),
@@ -1185,7 +1185,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
                             let i = name.to_string().parse::<usize>().ok();
                             i.and_then(|i| a_ty.parameters.0.get(i).cloned())
                         }
-                        TypeCtor::Adt(AdtDef::Struct(s)) => s.field(self.db, name).map(|field| {
+                        TypeCtor::Adt(Adt::Struct(s)) => s.field(self.db, name).map(|field| {
                             self.write_field_resolution(tgt_expr, field);
                             field.ty(self.db).subst(&a_ty.parameters)
                         }),
@@ -1489,7 +1489,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
         trait_.associated_type_by_name(self.db, &name::OUTPUT)
     }
 
-    fn resolve_boxed_box(&self) -> Option<AdtDef> {
+    fn resolve_boxed_box(&self) -> Option<Adt> {
         let boxed_box_path = Path {
             kind: PathKind::Abs,
             segments: vec![
@@ -1499,7 +1499,7 @@ impl<'a, D: HirDatabase> InferenceContext<'a, D> {
             ],
         };
         let struct_ = self.resolver.resolve_known_struct(self.db, &boxed_box_path)?;
-        Some(AdtDef::Struct(struct_))
+        Some(Adt::Struct(struct_))
     }
 }
 
diff --git a/crates/ra_hir/src/ty/lower.rs b/crates/ra_hir/src/ty/lower.rs
index e67525a748e3..946e9e9fb848 100644
--- a/crates/ra_hir/src/ty/lower.rs
+++ b/crates/ra_hir/src/ty/lower.rs
@@ -20,7 +20,7 @@ use crate::{
     nameres::Namespace,
     path::{GenericArg, PathSegment},
     resolve::{Resolution, Resolver},
-    ty::AdtDef,
+    ty::Adt,
     type_ref::{TypeBound, TypeRef},
     BuiltinType, Const, Enum, EnumVariant, Function, ModuleDef, Path, Static, Struct, StructField,
     Trait, TypeAlias, Union,
@@ -172,9 +172,7 @@ impl Ty {
     ) -> Substs {
         let def_generic: Option<GenericDef> = match resolved {
             TypableDef::Function(func) => Some(func.into()),
-            TypableDef::Struct(s) => Some(s.into()),
-            TypableDef::Union(u) => Some(u.into()),
-            TypableDef::Enum(e) => Some(e.into()),
+            TypableDef::Adt(adt) => Some(adt.into()),
             TypableDef::EnumVariant(var) => Some(var.parent_enum(db).into()),
             TypableDef::TypeAlias(t) => Some(t.into()),
             TypableDef::Const(_) | TypableDef::Static(_) | TypableDef::BuiltinType(_) => None,
@@ -193,9 +191,7 @@ impl Ty {
         let last = path.segments.last().expect("path should have at least one segment");
         let segment = match resolved {
             TypableDef::Function(_)
-            | TypableDef::Struct(_)
-            | TypableDef::Union(_)
-            | TypableDef::Enum(_)
+            | TypableDef::Adt(_)
             | TypableDef::Const(_)
             | TypableDef::Static(_)
             | TypableDef::TypeAlias(_)
@@ -410,11 +406,9 @@ fn assoc_type_bindings_from_type_bound<'a>(
 pub(crate) fn type_for_def(db: &impl HirDatabase, def: TypableDef, ns: Namespace) -> Ty {
     match (def, ns) {
         (TypableDef::Function(f), Namespace::Values) => type_for_fn(db, f),
-        (TypableDef::Struct(s), Namespace::Types) => type_for_adt(db, s),
-        (TypableDef::Struct(s), Namespace::Values) => type_for_struct_constructor(db, s),
-        (TypableDef::Enum(e), Namespace::Types) => type_for_adt(db, e),
+        (TypableDef::Adt(Adt::Struct(s)), Namespace::Values) => type_for_struct_constructor(db, s),
+        (TypableDef::Adt(adt), Namespace::Types) => type_for_adt(db, adt),
         (TypableDef::EnumVariant(v), Namespace::Values) => type_for_enum_variant_constructor(db, v),
-        (TypableDef::Union(u), Namespace::Types) => type_for_adt(db, u),
         (TypableDef::TypeAlias(t), Namespace::Types) => type_for_type_alias(db, t),
         (TypableDef::Const(c), Namespace::Values) => type_for_const(db, c),
         (TypableDef::Static(c), Namespace::Values) => type_for_static(db, c),
@@ -422,8 +416,8 @@ pub(crate) fn type_for_def(db: &impl HirDatabase, def: TypableDef, ns: Namespace
 
         // 'error' cases:
         (TypableDef::Function(_), Namespace::Types) => Ty::Unknown,
-        (TypableDef::Union(_), Namespace::Values) => Ty::Unknown,
-        (TypableDef::Enum(_), Namespace::Values) => Ty::Unknown,
+        (TypableDef::Adt(Adt::Union(_)), Namespace::Values) => Ty::Unknown,
+        (TypableDef::Adt(Adt::Enum(_)), Namespace::Values) => Ty::Unknown,
         (TypableDef::EnumVariant(_), Namespace::Types) => Ty::Unknown,
         (TypableDef::TypeAlias(_), Namespace::Values) => Ty::Unknown,
         (TypableDef::Const(_), Namespace::Types) => Ty::Unknown,
@@ -591,7 +585,7 @@ fn type_for_enum_variant_constructor(db: &impl HirDatabase, def: EnumVariant) ->
     Ty::apply(TypeCtor::FnDef(def.into()), substs)
 }
 
-fn type_for_adt(db: &impl HirDatabase, adt: impl Into<AdtDef> + HasGenericParams) -> Ty {
+fn type_for_adt(db: &impl HirDatabase, adt: impl Into<Adt> + HasGenericParams) -> Ty {
     let generics = adt.generic_params(db);
     Ty::apply(TypeCtor::Adt(adt.into()), Substs::identity(&generics))
 }
@@ -608,9 +602,7 @@ fn type_for_type_alias(db: &impl HirDatabase, t: TypeAlias) -> Ty {
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub enum TypableDef {
     Function(Function),
-    Struct(Struct),
-    Union(Union),
-    Enum(Enum),
+    Adt(Adt),
     EnumVariant(EnumVariant),
     TypeAlias(TypeAlias),
     Const(Const),
@@ -619,9 +611,7 @@ pub enum TypableDef {
 }
 impl_froms!(
     TypableDef: Function,
-    Struct,
-    Union,
-    Enum,
+    Adt(Struct, Enum, Union),
     EnumVariant,
     TypeAlias,
     Const,
@@ -633,9 +623,7 @@ impl From<ModuleDef> for Option<TypableDef> {
     fn from(def: ModuleDef) -> Option<TypableDef> {
         let res = match def {
             ModuleDef::Function(f) => f.into(),
-            ModuleDef::Struct(s) => s.into(),
-            ModuleDef::Union(u) => u.into(),
-            ModuleDef::Enum(e) => e.into(),
+            ModuleDef::Adt(adt) => adt.into(),
             ModuleDef::EnumVariant(v) => v.into(),
             ModuleDef::TypeAlias(t) => t.into(),
             ModuleDef::Const(v) => v.into(),
diff --git a/crates/ra_ide_api/src/completion/complete_dot.rs b/crates/ra_ide_api/src/completion/complete_dot.rs
index 2325cdf088af..9e64c86590c9 100644
--- a/crates/ra_ide_api/src/completion/complete_dot.rs
+++ b/crates/ra_ide_api/src/completion/complete_dot.rs
@@ -1,4 +1,4 @@
-use hir::{AdtDef, Ty, TypeCtor};
+use hir::{Adt, Ty, TypeCtor};
 
 use crate::completion::completion_item::CompletionKind;
 use crate::{
@@ -37,7 +37,7 @@ fn complete_fields(acc: &mut Completions, ctx: &CompletionContext, receiver: Ty)
     for receiver in ctx.analyzer.autoderef(ctx.db, receiver) {
         if let Ty::Apply(a_ty) = receiver {
             match a_ty.ctor {
-                TypeCtor::Adt(AdtDef::Struct(s)) => {
+                TypeCtor::Adt(Adt::Struct(s)) => {
                     for field in s.fields(ctx.db) {
                         acc.add_field(ctx, field, &a_ty.parameters);
                     }
diff --git a/crates/ra_ide_api/src/completion/complete_path.rs b/crates/ra_ide_api/src/completion/complete_path.rs
index 457a3d10c7ee..4d3414f33bab 100644
--- a/crates/ra_ide_api/src/completion/complete_path.rs
+++ b/crates/ra_ide_api/src/completion/complete_path.rs
@@ -1,4 +1,4 @@
-use hir::{Either, Resolution};
+use hir::{Adt, Either, Resolution};
 use ra_syntax::AstNode;
 use test_utils::tested_by;
 
@@ -37,19 +37,14 @@ pub(super) fn complete_path(acc: &mut Completions, ctx: &CompletionContext) {
                 acc.add_resolution(ctx, name.to_string(), &res.def.map(hir::Resolution::Def));
             }
         }
-        hir::ModuleDef::Enum(_)
-        | hir::ModuleDef::Struct(_)
-        | hir::ModuleDef::Union(_)
-        | hir::ModuleDef::TypeAlias(_) => {
-            if let hir::ModuleDef::Enum(e) = def {
+        hir::ModuleDef::Adt(_) | hir::ModuleDef::TypeAlias(_) => {
+            if let hir::ModuleDef::Adt(Adt::Enum(e)) = def {
                 for variant in e.variants(ctx.db) {
                     acc.add_enum_variant(ctx, variant);
                 }
             }
             let ty = match def {
-                hir::ModuleDef::Enum(e) => e.ty(ctx.db),
-                hir::ModuleDef::Struct(s) => s.ty(ctx.db),
-                hir::ModuleDef::Union(u) => u.ty(ctx.db),
+                hir::ModuleDef::Adt(adt) => adt.ty(ctx.db),
                 hir::ModuleDef::TypeAlias(a) => a.ty(ctx.db),
                 _ => unreachable!(),
             };
diff --git a/crates/ra_ide_api/src/completion/complete_pattern.rs b/crates/ra_ide_api/src/completion/complete_pattern.rs
index fb02844fad76..fb7f9feb8cec 100644
--- a/crates/ra_ide_api/src/completion/complete_pattern.rs
+++ b/crates/ra_ide_api/src/completion/complete_pattern.rs
@@ -15,7 +15,7 @@ pub(super) fn complete_pattern(acc: &mut Completions, ctx: &CompletionContext) {
             _ => continue,
         };
         match def {
-            hir::ModuleDef::Enum(..)
+            hir::ModuleDef::Adt(hir::Adt::Enum(..))
             | hir::ModuleDef::EnumVariant(..)
             | hir::ModuleDef::Const(..)
             | hir::ModuleDef::Module(..) => (),
diff --git a/crates/ra_ide_api/src/completion/presentation.rs b/crates/ra_ide_api/src/completion/presentation.rs
index 5cabe9a321ea..95bbd34b71a9 100644
--- a/crates/ra_ide_api/src/completion/presentation.rs
+++ b/crates/ra_ide_api/src/completion/presentation.rs
@@ -67,9 +67,13 @@ impl Completions {
             Resolution::Def(Function(func)) => {
                 return self.add_function_with_name(ctx, Some(local_name), *func);
             }
-            Resolution::Def(Struct(it)) => (CompletionItemKind::Struct, it.docs(ctx.db)),
-            Resolution::Def(Union(it)) => (CompletionItemKind::Struct, it.docs(ctx.db)),
-            Resolution::Def(Enum(it)) => (CompletionItemKind::Enum, it.docs(ctx.db)),
+            Resolution::Def(Adt(hir::Adt::Struct(it))) => {
+                (CompletionItemKind::Struct, it.docs(ctx.db))
+            }
+            Resolution::Def(Adt(hir::Adt::Union(it))) => {
+                (CompletionItemKind::Struct, it.docs(ctx.db))
+            }
+            Resolution::Def(Adt(hir::Adt::Enum(it))) => (CompletionItemKind::Enum, it.docs(ctx.db)),
             Resolution::Def(EnumVariant(it)) => (CompletionItemKind::EnumVariant, it.docs(ctx.db)),
             Resolution::Def(Const(it)) => (CompletionItemKind::Const, it.docs(ctx.db)),
             Resolution::Def(Static(it)) => (CompletionItemKind::Static, it.docs(ctx.db)),
diff --git a/crates/ra_ide_api/src/display/navigation_target.rs b/crates/ra_ide_api/src/display/navigation_target.rs
index c85214bb3549..03382ab3cba9 100644
--- a/crates/ra_ide_api/src/display/navigation_target.rs
+++ b/crates/ra_ide_api/src/display/navigation_target.rs
@@ -178,11 +178,11 @@ impl NavigationTarget {
         )
     }
 
-    pub(crate) fn from_adt_def(db: &RootDatabase, adt_def: hir::AdtDef) -> NavigationTarget {
+    pub(crate) fn from_adt_def(db: &RootDatabase, adt_def: hir::Adt) -> NavigationTarget {
         match adt_def {
-            hir::AdtDef::Struct(it) => NavigationTarget::from_def_source(db, it),
-            hir::AdtDef::Union(it) => NavigationTarget::from_def_source(db, it),
-            hir::AdtDef::Enum(it) => NavigationTarget::from_def_source(db, it),
+            hir::Adt::Struct(it) => NavigationTarget::from_def_source(db, it),
+            hir::Adt::Union(it) => NavigationTarget::from_def_source(db, it),
+            hir::Adt::Enum(it) => NavigationTarget::from_def_source(db, it),
         }
     }
 
@@ -193,9 +193,7 @@ impl NavigationTarget {
         let nav = match module_def {
             hir::ModuleDef::Module(module) => NavigationTarget::from_module(db, module),
             hir::ModuleDef::Function(func) => NavigationTarget::from_def_source(db, func),
-            hir::ModuleDef::Struct(it) => NavigationTarget::from_adt_def(db, it.into()),
-            hir::ModuleDef::Enum(it) => NavigationTarget::from_adt_def(db, it.into()),
-            hir::ModuleDef::Union(it) => NavigationTarget::from_adt_def(db, it.into()),
+            hir::ModuleDef::Adt(it) => NavigationTarget::from_adt_def(db, it),
             hir::ModuleDef::Const(it) => NavigationTarget::from_def_source(db, it),
             hir::ModuleDef::Static(it) => NavigationTarget::from_def_source(db, it),
             hir::ModuleDef::EnumVariant(it) => NavigationTarget::from_def_source(db, it),
diff --git a/crates/ra_ide_api/src/hover.rs b/crates/ra_ide_api/src/hover.rs
index 4b7847de852e..28a6bef12d4f 100644
--- a/crates/ra_ide_api/src/hover.rs
+++ b/crates/ra_ide_api/src/hover.rs
@@ -1,4 +1,4 @@
-use hir::{HasSource, HirDisplay};
+use hir::{Adt, HasSource, HirDisplay};
 use ra_db::SourceDatabase;
 use ra_syntax::{
     algo::{
@@ -129,9 +129,9 @@ pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeIn
                         }
                     }
                     hir::ModuleDef::Function(it) => res.extend(from_def_source(db, it)),
-                    hir::ModuleDef::Struct(it) => res.extend(from_def_source(db, it)),
-                    hir::ModuleDef::Union(it) => res.extend(from_def_source(db, it)),
-                    hir::ModuleDef::Enum(it) => res.extend(from_def_source(db, it)),
+                    hir::ModuleDef::Adt(Adt::Struct(it)) => res.extend(from_def_source(db, it)),
+                    hir::ModuleDef::Adt(Adt::Union(it)) => res.extend(from_def_source(db, it)),
+                    hir::ModuleDef::Adt(Adt::Enum(it)) => res.extend(from_def_source(db, it)),
                     hir::ModuleDef::EnumVariant(it) => res.extend(from_def_source(db, it)),
                     hir::ModuleDef::Const(it) => res.extend(from_def_source(db, it)),
                     hir::ModuleDef::Static(it) => res.extend(from_def_source(db, it)),
@@ -145,9 +145,9 @@ pub(crate) fn hover(db: &RootDatabase, position: FilePosition) -> Option<RangeIn
             Some(SelfType(ty)) => {
                 if let Some((adt_def, _)) = ty.as_adt() {
                     res.extend(match adt_def {
-                        hir::AdtDef::Struct(it) => from_def_source(db, it),
-                        hir::AdtDef::Union(it) => from_def_source(db, it),
-                        hir::AdtDef::Enum(it) => from_def_source(db, it),
+                        hir::Adt::Struct(it) => from_def_source(db, it),
+                        hir::Adt::Union(it) => from_def_source(db, it),
+                        hir::Adt::Enum(it) => from_def_source(db, it),
                     })
                 }
             }
diff --git a/crates/ra_ide_api/src/name_ref_kind.rs b/crates/ra_ide_api/src/name_ref_kind.rs
index 34a8bcc365b9..6c2a7b260b4e 100644
--- a/crates/ra_ide_api/src/name_ref_kind.rs
+++ b/crates/ra_ide_api/src/name_ref_kind.rs
@@ -60,7 +60,7 @@ pub(crate) fn classify_name_ref(
         let record_lit = field_expr.syntax().ancestors().find_map(ast::RecordLit::cast);
 
         if let Some(ty) = record_lit.and_then(|lit| analyzer.type_of(db, &lit.into())) {
-            if let Some((hir::AdtDef::Struct(s), _)) = ty.as_adt() {
+            if let Some((hir::Adt::Struct(s), _)) = ty.as_adt() {
                 let hir_path = hir::Path::from_name_ref(name_ref);
                 let hir_name = hir_path.as_ident().unwrap();
 
diff --git a/crates/ra_ide_api/src/syntax_highlighting.rs b/crates/ra_ide_api/src/syntax_highlighting.rs
index 06ccf0728679..86ab3a26056e 100644
--- a/crates/ra_ide_api/src/syntax_highlighting.rs
+++ b/crates/ra_ide_api/src/syntax_highlighting.rs
@@ -107,9 +107,7 @@ pub(crate) fn highlight(db: &RootDatabase, file_id: FileId) -> Vec<HighlightedRa
                         Some(AssocItem(hir::ImplItem::TypeAlias(_))) => "type",
                         Some(Def(hir::ModuleDef::Module(_))) => "module",
                         Some(Def(hir::ModuleDef::Function(_))) => "function",
-                        Some(Def(hir::ModuleDef::Struct(_))) => "type",
-                        Some(Def(hir::ModuleDef::Union(_))) => "type",
-                        Some(Def(hir::ModuleDef::Enum(_))) => "type",
+                        Some(Def(hir::ModuleDef::Adt(_))) => "type",
                         Some(Def(hir::ModuleDef::EnumVariant(_))) => "constant",
                         Some(Def(hir::ModuleDef::Const(_))) => "constant",
                         Some(Def(hir::ModuleDef::Static(_))) => "constant",