Remove AstNode and AnyNode (#15479)

While looking into potential AST optimizations, I noticed the `AstNode`
trait and `AnyNode` type aren't used anywhere in Ruff or Red Knot. It
looks like they might be historical artifacts of previous ways of
consuming AST nodes?

- `AstNode::cast`, `AstNode::cast_ref`, and `AstNode::can_cast` are not
used anywhere.
- Since `cast_ref` isn't needed anymore, the `Ref` associated type isn't
either.

This is a pure refactoring, with no intended behavior changes.

crates/ruff_linter/src/rules/flake8_pytest_style/rules/parametrize.rs

@@ -4,7 +4,6 @@ use ruff_diagnostics::{Diagnostic, Edit, Fix, FixAvailability, Violation};
 use ruff_macros::{derive_message_formats, ViolationMetadata};
 use ruff_python_ast::comparable::ComparableExpr;
 use ruff_python_ast::parenthesize::parenthesized_range;
-use ruff_python_ast::AstNode;
 use ruff_python_ast::{self as ast, Expr, ExprCall, ExprContext};
 use ruff_python_codegen::Generator;
 use ruff_python_trivia::CommentRanges;
@@ -324,7 +323,7 @@ fn get_parametrize_name_range(
 ) -> Option<TextRange> {
     parenthesized_range(
         expr.into(),
-        call.arguments.as_any_node_ref(),
+        (&call.arguments).into(),
         comment_ranges,
         source,
     )

crates/ruff_linter/src/rules/flake8_use_pathlib/rules/path_constructor_current_directory.rs

@@ -3,7 +3,7 @@ use std::ops::Range;
 use ruff_diagnostics::{AlwaysFixableViolation, Applicability, Diagnostic, Edit, Fix};
 use ruff_macros::{derive_message_formats, ViolationMetadata};
 use ruff_python_ast::parenthesize::parenthesized_range;
-use ruff_python_ast::{AstNode, Expr, ExprBinOp, ExprCall, Operator};
+use ruff_python_ast::{Expr, ExprBinOp, ExprCall, Operator};
 use ruff_python_semantic::SemanticModel;
 use ruff_python_trivia::CommentRanges;
 use ruff_text_size::{Ranged, TextRange};
@@ -134,12 +134,6 @@ fn parent_and_next_path_fragment_range(
 
     Some((
         parent.range(),
-        parenthesized_range(
-            right.into(),
-            parent.as_any_node_ref(),
-            comment_ranges,
-            source,
-        )
-        .unwrap_or(range),
+        parenthesized_range(right.into(), parent.into(), comment_ranges, source).unwrap_or(range),
     ))
 }

crates/ruff_linter/src/rules/pycodestyle/rules/lambda_assignment.rs

@@ -2,7 +2,7 @@ use ruff_diagnostics::{Diagnostic, Edit, Fix, FixAvailability, Violation};
 use ruff_macros::{derive_message_formats, ViolationMetadata};
 use ruff_python_ast::parenthesize::parenthesized_range;
 use ruff_python_ast::{
-    self as ast, AstNode, Expr, ExprEllipsisLiteral, ExprLambda, Identifier, Parameter,
+    self as ast, Expr, ExprEllipsisLiteral, ExprLambda, Identifier, Parameter,
     ParameterWithDefault, Parameters, Stmt,
 };
 use ruff_python_semantic::SemanticModel;
@@ -263,7 +263,7 @@ fn replace_trailing_ellipsis_with_original_expr(
 ) -> String {
     let original_expr_range = parenthesized_range(
         (&lambda.body).into(),
-        lambda.as_any_node_ref(),
+        lambda.into(),
         checker.comment_ranges(),
         checker.source(),
     )

crates/ruff_linter/src/rules/pylint/rules/non_augmented_assignment.rs

@@ -4,7 +4,7 @@ use ruff_macros::{derive_message_formats, ViolationMetadata};
 use ruff_python_ast as ast;
 use ruff_python_ast::comparable::ComparableExpr;
 use ruff_python_ast::parenthesize::parenthesized_range;
-use ruff_python_ast::{AstNode, ExprBinOp, ExpressionRef, Operator};
+use ruff_python_ast::{ExprBinOp, ExpressionRef, Operator};
 use ruff_text_size::{Ranged, TextRange};
 
 use crate::checkers::ast::Checker;
@@ -147,7 +147,7 @@ fn augmented_assignment(
     let locator = checker.locator();
 
     let right_operand_ref = ExpressionRef::from(right_operand);
-    let parent = original_expr.as_any_node_ref();
+    let parent = original_expr.into();
     let comment_ranges = checker.comment_ranges();
     let source = checker.source();
 

crates/ruff_linter/src/rules/ruff/rules/quadratic_list_summation.rs

@@ -4,7 +4,6 @@ use itertools::Itertools;
 use ruff_diagnostics::{AlwaysFixableViolation, Diagnostic, Edit, Fix};
 use ruff_macros::{derive_message_formats, ViolationMetadata};
 use ruff_python_ast::parenthesize::parenthesized_range;
-use ruff_python_ast::AstNode;
 use ruff_python_ast::{self as ast, Arguments, Expr};
 use ruff_python_semantic::SemanticModel;
 use ruff_text_size::Ranged;
@@ -110,7 +109,7 @@ fn convert_to_reduce(iterable: &Expr, call: &ast::ExprCall, checker: &Checker) -
     let iterable = checker.locator().slice(
         parenthesized_range(
             iterable.into(),
-            call.arguments.as_any_node_ref(),
+            (&call.arguments).into(),
             checker.comment_ranges(),
             checker.locator().contents(),
         )

crates/ruff_python_ast/ast.toml

@@ -23,9 +23,8 @@
 #   is, `StmtIf` will become `if_stmt`.)
 #
 # anynode_is_label: foo_bar
-#   Controls the name of the AnyNode::foo_bar, AnyNode::is_foo_bar, and
-#   AnyNodeRef::is_foo_bar methods.  The default is the group name in
-#   snake_case.
+#   Controls the name of the AnyNodeRef::is_foo_bar method.  The default is the
+#   group name in snake_case.
 #
 # ref_enum_ty:
 #   The name of the reference enum that we create for this group.  The default