[red-knot] Simplify some traits in ast_ids.rs (#14379)

crates/red_knot_python_semantic/src/semantic_index/ast_ids.rs

@@ -49,64 +49,50 @@ fn ast_ids<'db>(db: &'db dyn Db, scope: ScopeId) -> &'db AstIds {
     semantic_index(db, scope.file(db)).ast_ids(scope.file_scope_id(db))
 }
 
-pub trait HasScopedUseId {
-    /// The type of the ID uniquely identifying the use.
-    type Id: Copy;
-
-    /// Returns the ID that uniquely identifies the use in `scope`.
-    fn scoped_use_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id;
-}
-
 /// Uniquely identifies a use of a name in a [`crate::semantic_index::symbol::FileScopeId`].
 #[newtype_index]
 pub struct ScopedUseId;
 
-impl HasScopedUseId for ast::ExprName {
-    type Id = ScopedUseId;
+pub trait HasScopedUseId {
+    /// Returns the ID that uniquely identifies the use in `scope`.
+    fn scoped_use_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedUseId;
+}
 
-    fn scoped_use_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id {
+impl HasScopedUseId for ast::ExprName {
+    fn scoped_use_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedUseId {
         let expression_ref = ExpressionRef::from(self);
         expression_ref.scoped_use_id(db, scope)
     }
 }
 
 impl HasScopedUseId for ast::ExpressionRef<'_> {
-    type Id = ScopedUseId;
-
-    fn scoped_use_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id {
+    fn scoped_use_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedUseId {
         let ast_ids = ast_ids(db, scope);
         ast_ids.use_id(*self)
     }
 }
 
-pub trait HasScopedAstId {
-    /// The type of the ID uniquely identifying the node.
-    type Id: Copy;
+/// Uniquely identifies an [`ast::Expr`] in a [`crate::semantic_index::symbol::FileScopeId`].
+#[newtype_index]
+pub struct ScopedExpressionId;
 
+pub trait HasScopedExpressionId {
     /// Returns the ID that uniquely identifies the node in `scope`.
-    fn scoped_ast_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id;
+    fn scoped_expression_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedExpressionId;
 }
 
-impl<T: HasScopedAstId> HasScopedAstId for Box<T> {
-    type Id = <T as HasScopedAstId>::Id;
-
-    fn scoped_ast_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id {
-        self.as_ref().scoped_ast_id(db, scope)
+impl<T: HasScopedExpressionId> HasScopedExpressionId for Box<T> {
+    fn scoped_expression_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedExpressionId {
+        self.as_ref().scoped_expression_id(db, scope)
     }
 }
 
-/// Uniquely identifies an [`ast::Expr`] in a [`crate::semantic_index::symbol::FileScopeId`].
-#[newtype_index]
-pub struct ScopedExpressionId;
-
 macro_rules! impl_has_scoped_expression_id {
     ($ty: ty) => {
-        impl HasScopedAstId for $ty {
-            type Id = ScopedExpressionId;
-
-            fn scoped_ast_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id {
+        impl HasScopedExpressionId for $ty {
+            fn scoped_expression_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedExpressionId {
                 let expression_ref = ExpressionRef::from(self);
-                expression_ref.scoped_ast_id(db, scope)
+                expression_ref.scoped_expression_id(db, scope)
             }
         }
     };
@@ -146,10 +132,8 @@ impl_has_scoped_expression_id!(ast::ExprSlice);
 impl_has_scoped_expression_id!(ast::ExprIpyEscapeCommand);
 impl_has_scoped_expression_id!(ast::Expr);
 
-impl HasScopedAstId for ast::ExpressionRef<'_> {
-    type Id = ScopedExpressionId;
-
-    fn scoped_ast_id(&self, db: &dyn Db, scope: ScopeId) -> Self::Id {
+impl HasScopedExpressionId for ast::ExpressionRef<'_> {
+    fn scoped_expression_id(&self, db: &dyn Db, scope: ScopeId) -> ScopedExpressionId {
         let ast_ids = ast_ids(db, scope);
         ast_ids.expression_id(*self)
     }

crates/red_knot_python_semantic/src/semantic_model.rs

@@ -6,7 +6,7 @@ use ruff_source_file::LineIndex;
 
 use crate::module_name::ModuleName;
 use crate::module_resolver::{resolve_module, Module};
-use crate::semantic_index::ast_ids::HasScopedAstId;
+use crate::semantic_index::ast_ids::HasScopedExpressionId;
 use crate::semantic_index::semantic_index;
 use crate::types::{binding_ty, infer_scope_types, Type};
 use crate::Db;
@@ -54,7 +54,7 @@ impl HasTy for ast::ExpressionRef<'_> {
         let file_scope = index.expression_scope_id(*self);
         let scope = file_scope.to_scope_id(model.db, model.file);
 
-        let expression_id = self.scoped_ast_id(model.db, scope);
+        let expression_id = self.scoped_expression_id(model.db, scope);
         infer_scope_types(model.db, scope).expression_ty(expression_id)
     }
 }

crates/red_knot_python_semantic/src/types.rs

@@ -14,7 +14,7 @@ pub(crate) use self::infer::{
 };
 pub(crate) use self::signatures::Signature;
 use crate::module_resolver::file_to_module;
-use crate::semantic_index::ast_ids::HasScopedAstId;
+use crate::semantic_index::ast_ids::HasScopedExpressionId;
 use crate::semantic_index::definition::Definition;
 use crate::semantic_index::symbol::{self as symbol, ScopeId, ScopedSymbolId};
 use crate::semantic_index::{
@@ -207,7 +207,7 @@ fn definition_expression_ty<'db>(
     let index = semantic_index(db, file);
     let file_scope = index.expression_scope_id(expression);
     let scope = file_scope.to_scope_id(db, file);
-    let expr_id = expression.scoped_ast_id(db, scope);
+    let expr_id = expression.scoped_expression_id(db, scope);
     if scope == definition.scope(db) {
         // expression is in the definition scope
         let inference = infer_definition_types(db, definition);

crates/red_knot_python_semantic/src/types/infer.rs

@@ -38,7 +38,7 @@ use salsa::plumbing::AsId;
 
 use crate::module_name::ModuleName;
 use crate::module_resolver::{file_to_module, resolve_module};
-use crate::semantic_index::ast_ids::{HasScopedAstId, HasScopedUseId, ScopedExpressionId};
+use crate::semantic_index::ast_ids::{HasScopedExpressionId, HasScopedUseId, ScopedExpressionId};
 use crate::semantic_index::definition::{
     AssignmentDefinitionKind, Definition, DefinitionKind, DefinitionNodeKey,
     ExceptHandlerDefinitionKind, TargetKind,
@@ -181,7 +181,7 @@ fn infer_unpack_types<'db>(db: &'db dyn Db, unpack: Unpack<'db>) -> UnpackResult
     let scope = unpack.scope(db);
 
     let result = infer_expression_types(db, value);
-    let value_ty = result.expression_ty(value.node_ref(db).scoped_ast_id(db, scope));
+    let value_ty = result.expression_ty(value.node_ref(db).scoped_expression_id(db, scope));
 
     let mut unpacker = Unpacker::new(db, file);
     unpacker.unpack(unpack.target(db), value_ty, scope);
@@ -409,7 +409,7 @@ impl<'db> TypeInferenceBuilder<'db> {
     #[track_caller]
     fn expression_ty(&self, expr: &ast::Expr) -> Type<'db> {
         self.types
-            .expression_ty(expr.scoped_ast_id(self.db, self.scope()))
+            .expression_ty(expr.scoped_expression_id(self.db, self.scope()))
     }
 
     /// Infers types in the given [`InferenceRegion`].
@@ -1215,9 +1215,10 @@ impl<'db> TypeInferenceBuilder<'db> {
             is_async,
         );
 
-        self.types
-            .expressions
-            .insert(target.scoped_ast_id(self.db, self.scope()), target_ty);
+        self.types.expressions.insert(
+            target.scoped_expression_id(self.db, self.scope()),
+            target_ty,
+        );
         self.add_binding(target.into(), definition, target_ty);
     }
 
@@ -1607,7 +1608,7 @@ impl<'db> TypeInferenceBuilder<'db> {
         self.infer_standalone_expression(value);
 
         let value_ty = self.expression_ty(value);
-        let name_ast_id = name.scoped_ast_id(self.db, self.scope());
+        let name_ast_id = name.scoped_expression_id(self.db, self.scope());
 
         let target_ty = match assignment.target() {
             TargetKind::Sequence(unpack) => {
@@ -2211,18 +2212,14 @@ impl<'db> TypeInferenceBuilder<'db> {
         ty
     }
 
-    fn store_expression_type(
-        &mut self,
-        expression: &impl HasScopedAstId<Id = ScopedExpressionId>,
-        ty: Type<'db>,
-    ) {
+    fn store_expression_type(&mut self, expression: &impl HasScopedExpressionId, ty: Type<'db>) {
         if self.deferred_state.in_string_annotation() {
             // Avoid storing the type of expressions that are part of a string annotation because
             // the expression ids don't exists in the semantic index. Instead, we'll store the type
             // on the string expression itself that represents the annotation.
             return;
         }
-        let expr_id = expression.scoped_ast_id(self.db, self.scope());
+        let expr_id = expression.scoped_expression_id(self.db, self.scope());
         let previous = self.types.expressions.insert(expr_id, ty);
         assert_eq!(previous, None);
     }
@@ -2541,10 +2538,10 @@ impl<'db> TypeInferenceBuilder<'db> {
                 .parent_scope_id(self.scope().file_scope_id(self.db))
                 .expect("A comprehension should never be the top-level scope")
                 .to_scope_id(self.db, self.file);
-            result.expression_ty(iterable.scoped_ast_id(self.db, lookup_scope))
+            result.expression_ty(iterable.scoped_expression_id(self.db, lookup_scope))
         } else {
             self.extend(result);
-            result.expression_ty(iterable.scoped_ast_id(self.db, self.scope()))
+            result.expression_ty(iterable.scoped_expression_id(self.db, self.scope()))
         };
 
         let target_ty = if is_async {
@@ -2556,9 +2553,10 @@ impl<'db> TypeInferenceBuilder<'db> {
                 .unwrap_with_diagnostic(iterable.into(), &mut self.diagnostics)
         };
 
-        self.types
-            .expressions
-            .insert(target.scoped_ast_id(self.db, self.scope()), target_ty);
+        self.types.expressions.insert(
+            target.scoped_expression_id(self.db, self.scope()),
+            target_ty,
+        );
         self.add_binding(target.into(), definition, target_ty);
     }
 

crates/red_knot_python_semantic/src/types/narrow.rs

@@ -1,4 +1,4 @@
-use crate::semantic_index::ast_ids::HasScopedAstId;
+use crate::semantic_index::ast_ids::HasScopedExpressionId;
 use crate::semantic_index::constraint::{Constraint, ConstraintNode, PatternConstraint};
 use crate::semantic_index::definition::Definition;
 use crate::semantic_index::expression::Expression;
@@ -291,7 +291,7 @@ impl<'db> NarrowingConstraintsBuilder<'db> {
             {
                 // SAFETY: we should always have a symbol for every Name node.
                 let symbol = self.symbols().symbol_id_by_name(id).unwrap();
-                let rhs_ty = inference.expression_ty(right.scoped_ast_id(self.db, scope));
+                let rhs_ty = inference.expression_ty(right.scoped_expression_id(self.db, scope));
 
                 match if is_positive { *op } else { op.negate() } {
                     ast::CmpOp::IsNot => {
@@ -336,7 +336,7 @@ impl<'db> NarrowingConstraintsBuilder<'db> {
         // TODO: add support for PEP 604 union types on the right hand side of `isinstance`
         // and `issubclass`, for example `isinstance(x, str | (int | float))`.
         match inference
-            .expression_ty(expr_call.func.scoped_ast_id(self.db, scope))
+            .expression_ty(expr_call.func.scoped_expression_id(self.db, scope))
             .into_function_literal()
             .and_then(|f| f.known(self.db))
             .and_then(KnownFunction::constraint_function)
@@ -348,7 +348,7 @@ impl<'db> NarrowingConstraintsBuilder<'db> {
                     let symbol = self.symbols().symbol_id_by_name(id).unwrap();
 
                     let class_info_ty =
-                        inference.expression_ty(class_info.scoped_ast_id(self.db, scope));
+                        inference.expression_ty(class_info.scoped_expression_id(self.db, scope));
 
                     let to_constraint = match function {
                         KnownConstraintFunction::IsInstance => {
@@ -414,7 +414,7 @@ impl<'db> NarrowingConstraintsBuilder<'db> {
             // filter our arms with statically known truthiness
             .filter(|expr| {
                 inference
-                    .expression_ty(expr.scoped_ast_id(self.db, scope))
+                    .expression_ty(expr.scoped_expression_id(self.db, scope))
                     .bool(self.db)
                     != match expr_bool_op.op {
                         BoolOp::And => Truthiness::AlwaysTrue,

crates/red_knot_python_semantic/src/types/unpacker.rs

@@ -4,7 +4,7 @@ use ruff_db::files::File;
 use ruff_python_ast::{self as ast, AnyNodeRef};
 use rustc_hash::FxHashMap;
 
-use crate::semantic_index::ast_ids::{HasScopedAstId, ScopedExpressionId};
+use crate::semantic_index::ast_ids::{HasScopedExpressionId, ScopedExpressionId};
 use crate::semantic_index::symbol::ScopeId;
 use crate::types::{Type, TypeCheckDiagnostics, TypeCheckDiagnosticsBuilder};
 use crate::Db;
@@ -29,7 +29,7 @@ impl<'db> Unpacker<'db> {
         match target {
             ast::Expr::Name(target_name) => {
                 self.targets
-                    .insert(target_name.scoped_ast_id(self.db, scope), value_ty);
+                    .insert(target_name.scoped_expression_id(self.db, scope), value_ty);
             }
             ast::Expr::Starred(ast::ExprStarred { value, .. }) => {
                 self.unpack(value, value_ty, scope);