Auto merge of rust-lang#12628 - Veykril:simplify, r=Veykril

internal: Simplify

Author: bors

crates/hir-def/src/generics.rs

@@ -146,6 +146,15 @@ impl GenericParams {
     ) -> Interned<GenericParams> {
         let _p = profile::span("generic_params_query");
 
+        macro_rules! id_to_generics {
+            ($id:ident) => {{
+                let id = $id.lookup(db).id;
+                let tree = id.item_tree(db);
+                let item = &tree[id.value];
+                item.generic_params.clone()
+            }};
+        }
+
         match def {
             GenericDefId::FunctionId(id) => {
                 let loc = id.lookup(db);
@@ -166,42 +175,12 @@ impl GenericParams {
 
                 Interned::new(generic_params)
             }
-            GenericDefId::AdtId(AdtId::StructId(id)) => {
-                let id = id.lookup(db).id;
-                let tree = id.item_tree(db);
-                let item = &tree[id.value];
-                item.generic_params.clone()
-            }
-            GenericDefId::AdtId(AdtId::EnumId(id)) => {
-                let id = id.lookup(db).id;
-                let tree = id.item_tree(db);
-                let item = &tree[id.value];
-                item.generic_params.clone()
-            }
-            GenericDefId::AdtId(AdtId::UnionId(id)) => {
-                let id = id.lookup(db).id;
-                let tree = id.item_tree(db);
-                let item = &tree[id.value];
-                item.generic_params.clone()
-            }
-            GenericDefId::TraitId(id) => {
-                let id = id.lookup(db).id;
-                let tree = id.item_tree(db);
-                let item = &tree[id.value];
-                item.generic_params.clone()
-            }
-            GenericDefId::TypeAliasId(id) => {
-                let id = id.lookup(db).id;
-                let tree = id.item_tree(db);
-                let item = &tree[id.value];
-                item.generic_params.clone()
-            }
-            GenericDefId::ImplId(id) => {
-                let id = id.lookup(db).id;
-                let tree = id.item_tree(db);
-                let item = &tree[id.value];
-                item.generic_params.clone()
-            }
+            GenericDefId::AdtId(AdtId::StructId(id)) => id_to_generics!(id),
+            GenericDefId::AdtId(AdtId::EnumId(id)) => id_to_generics!(id),
+            GenericDefId::AdtId(AdtId::UnionId(id)) => id_to_generics!(id),
+            GenericDefId::TraitId(id) => id_to_generics!(id),
+            GenericDefId::TypeAliasId(id) => id_to_generics!(id),
+            GenericDefId::ImplId(id) => id_to_generics!(id),
             GenericDefId::EnumVariantId(_) | GenericDefId::ConstId(_) => {
                 Interned::new(GenericParams::default())
             }
@@ -393,15 +372,14 @@ impl GenericParams {
 
     pub fn find_trait_self_param(&self) -> Option<LocalTypeOrConstParamId> {
         self.type_or_consts.iter().find_map(|(id, p)| {
-            if let TypeOrConstParamData::TypeParamData(p) = p {
-                if p.provenance == TypeParamProvenance::TraitSelf {
-                    Some(id)
-                } else {
-                    None
-                }
-            } else {
-                None
-            }
+            matches!(
+                p,
+                TypeOrConstParamData::TypeParamData(TypeParamData {
+                    provenance: TypeParamProvenance::TraitSelf,
+                    ..
+                })
+            )
+            .then(|| id)
         })
     }
 }

crates/hir-def/src/path.rs

@@ -11,7 +11,7 @@ use crate::{
     intern::Interned,
     type_ref::{ConstScalarOrPath, LifetimeRef},
 };
-use hir_expand::name::{name, Name};
+use hir_expand::name::Name;
 use syntax::ast;
 
 use crate::type_ref::{TypeBound, TypeRef};
@@ -134,9 +134,7 @@ impl Path {
     }
 
     pub fn is_self_type(&self) -> bool {
-        self.type_anchor.is_none()
-            && *self.generic_args == [None]
-            && self.mod_path.as_ident() == Some(&name!(Self))
+        self.type_anchor.is_none() && *self.generic_args == [None] && self.mod_path.is_Self()
     }
 }
 

crates/hir-def/src/type_ref.rs

@@ -109,7 +109,6 @@ pub enum TypeRef {
     Slice(Box<TypeRef>),
     /// A fn pointer. Last element of the vector is the return type.
     Fn(Vec<(Option<Name>, TypeRef)>, bool /*varargs*/),
-    // For
     ImplTrait(Vec<Interned<TypeBound>>),
     DynTrait(Vec<Interned<TypeBound>>),
     Macro(AstId<ast::MacroCall>),

crates/hir-expand/src/mod_path.rs

@@ -80,6 +80,12 @@ impl ModPath {
         self.kind == PathKind::Super(0) && self.segments.is_empty()
     }
 
+    #[allow(non_snake_case)]
+    pub fn is_Self(&self) -> bool {
+        self.kind == PathKind::Plain
+            && matches!(&*self.segments, [name] if *name == known::SELF_TYPE)
+    }
+
     /// If this path is a single identifier, like `foo`, return its name.
     pub fn as_ident(&self) -> Option<&Name> {
         if self.kind != PathKind::Plain {

crates/hir-ty/src/lower.rs

@@ -5,31 +5,33 @@
 //!  - Building the type for an item: This happens through the `type_for_def` query.
 //!
 //! This usually involves resolving names, collecting generic arguments etc.
-use std::cell::{Cell, RefCell};
-use std::{iter, sync::Arc};
+use std::{
+    cell::{Cell, RefCell},
+    iter,
+    sync::Arc,
+};
 
 use base_db::CrateId;
-use chalk_ir::fold::Fold;
-use chalk_ir::interner::HasInterner;
-use chalk_ir::{cast::Cast, fold::Shift, Mutability, Safety};
-use hir_def::generics::TypeOrConstParamData;
-use hir_def::intern::Interned;
-use hir_def::lang_item::lang_attr;
-use hir_def::path::{ModPath, PathKind};
-use hir_def::type_ref::ConstScalarOrPath;
+use chalk_ir::{cast::Cast, fold::Fold, fold::Shift, interner::HasInterner, Mutability, Safety};
+
 use hir_def::{
     adt::StructKind,
     body::{Expander, LowerCtx},
     builtin_type::BuiltinType,
-    generics::{TypeParamProvenance, WherePredicate, WherePredicateTypeTarget},
-    path::{GenericArg, Path, PathSegment, PathSegments},
+    generics::{
+        TypeOrConstParamData, TypeParamProvenance, WherePredicate, WherePredicateTypeTarget,
+    },
+    intern::Interned,
+    lang_item::lang_attr,
+    path::{GenericArg, ModPath, Path, PathKind, PathSegment, PathSegments},
     resolver::{HasResolver, Resolver, TypeNs},
-    type_ref::{TraitBoundModifier, TraitRef as HirTraitRef, TypeBound, TypeRef},
-    AdtId, AssocItemId, ConstId, EnumId, EnumVariantId, FunctionId, GenericDefId, HasModule,
-    ImplId, ItemContainerId, LocalFieldId, Lookup, StaticId, StructId, TraitId, TypeAliasId,
-    UnionId, VariantId,
+    type_ref::{
+        ConstScalarOrPath, TraitBoundModifier, TraitRef as HirTraitRef, TypeBound, TypeRef,
+    },
+    AdtId, AssocItemId, ConstId, ConstParamId, EnumId, EnumVariantId, FunctionId, GenericDefId,
+    HasModule, ImplId, ItemContainerId, LocalFieldId, Lookup, StaticId, StructId, TraitId,
+    TypeAliasId, TypeOrConstParamId, TypeParamId, UnionId, VariantId,
 };
-use hir_def::{ConstParamId, TypeOrConstParamId, TypeParamId};
 use hir_expand::{name::Name, ExpandResult};
 use itertools::Either;
 use la_arena::ArenaMap;
@@ -38,20 +40,19 @@ use smallvec::SmallVec;
 use stdx::{impl_from, never};
 use syntax::{ast, SmolStr};
 
-use crate::consteval::{
-    intern_scalar_const, path_to_const, unknown_const, unknown_const_as_generic,
-};
-use crate::utils::Generics;
-use crate::{all_super_traits, make_binders, Const, GenericArgData, ParamKind};
 use crate::{
+    all_super_traits,
+    consteval::{intern_scalar_const, path_to_const, unknown_const, unknown_const_as_generic},
     db::HirDatabase,
+    make_binders,
     mapping::ToChalk,
     static_lifetime, to_assoc_type_id, to_chalk_trait_id, to_placeholder_idx,
+    utils::Generics,
     utils::{all_super_trait_refs, associated_type_by_name_including_super_traits, generics},
-    AliasEq, AliasTy, Binders, BoundVar, CallableSig, DebruijnIndex, DynTy, FnPointer, FnSig,
-    FnSubst, ImplTraitId, Interner, PolyFnSig, ProjectionTy, QuantifiedWhereClause,
-    QuantifiedWhereClauses, ReturnTypeImplTrait, ReturnTypeImplTraits, Substitution,
-    TraitEnvironment, TraitRef, TraitRefExt, Ty, TyBuilder, TyKind, WhereClause,
+    AliasEq, AliasTy, Binders, BoundVar, CallableSig, Const, DebruijnIndex, DynTy, FnPointer,
+    FnSig, FnSubst, GenericArgData, ImplTraitId, Interner, ParamKind, PolyFnSig, ProjectionTy,
+    QuantifiedWhereClause, QuantifiedWhereClauses, ReturnTypeImplTrait, ReturnTypeImplTraits,
+    Substitution, TraitEnvironment, TraitRef, TraitRefExt, Ty, TyBuilder, TyKind, WhereClause,
 };
 
 #[derive(Debug)]

crates/hir-ty/src/utils.rs

@@ -12,13 +12,12 @@ use hir_def::{
         WherePredicateTypeTarget,
     },
     intern::Interned,
-    path::Path,
     resolver::{HasResolver, TypeNs},
     type_ref::{TraitBoundModifier, TypeRef},
     ConstParamId, FunctionId, GenericDefId, ItemContainerId, Lookup, TraitId, TypeAliasId,
     TypeOrConstParamId, TypeParamId,
 };
-use hir_expand::name::{known, name, Name};
+use hir_expand::name::{known, Name};
 use itertools::Either;
 use rustc_hash::FxHashSet;
 use smallvec::{smallvec, SmallVec};
@@ -53,25 +52,25 @@ fn direct_super_traits(db: &dyn DefDatabase, trait_: TraitId) -> SmallVec<[Trait
         .iter()
         .filter_map(|pred| match pred {
             WherePredicate::ForLifetime { target, bound, .. }
-            | WherePredicate::TypeBound { target, bound } => match target {
-                WherePredicateTypeTarget::TypeRef(type_ref) => match &**type_ref {
-                    TypeRef::Path(p) if p == &Path::from(name![Self]) => bound.as_path(),
-                    _ => None,
-                },
-                WherePredicateTypeTarget::TypeOrConstParam(local_id)
-                    if Some(*local_id) == trait_self =>
-                {
-                    bound.as_path()
+            | WherePredicate::TypeBound { target, bound } => {
+                let is_trait = match target {
+                    WherePredicateTypeTarget::TypeRef(type_ref) => match &**type_ref {
+                        TypeRef::Path(p) => p.is_self_type(),
+                        _ => false,
+                    },
+                    WherePredicateTypeTarget::TypeOrConstParam(local_id) => {
+                        Some(*local_id) == trait_self
+                    }
+                };
+                match is_trait {
+                    true => bound.as_path(),
+                    false => None,
                 }
-                _ => None,
-            },
+            }
             WherePredicate::Lifetime { .. } => None,
         })
-        .filter_map(|(path, bound_modifier)| match bound_modifier {
-            TraitBoundModifier::None => Some(path),
-            TraitBoundModifier::Maybe => None,
-        })
-        .filter_map(|path| match resolver.resolve_path_in_type_ns_fully(db, path.mod_path()) {
+        .filter(|(_, bound_modifier)| matches!(bound_modifier, TraitBoundModifier::None))
+        .filter_map(|(path, _)| match resolver.resolve_path_in_type_ns_fully(db, path.mod_path()) {
             Some(TypeNs::TraitId(t)) => Some(t),
             _ => None,
         })