[kernel] Move Pattern nodes to package:kernel

These AST nodes were so far internal to the CFE, but since we need to
move the pattern lowering to the constant evaluator we need to support them in the AST defined in package:kernel.

TEST=existing

Change-Id: Ie6c5f0f8ad75a866c5d965fdf506bc869ffaf654
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/288241
Reviewed-by: Chloe Stefantsova <[email protected]>
Commit-Queue: Johnni Winther <[email protected]>
Reviewed-by: Alexander Markov <[email protected]>
Reviewed-by: Joshua Litt <[email protected]>

Author: johnniwinther

pkg/_js_interop_checks/lib/js_interop_checks.dart

@@ -35,7 +35,7 @@ import 'package:_js_interop_checks/src/transformations/export_checker.dart';
 // Used for importing CFE utility functions for constructor tear-offs.
 import 'package:front_end/src/api_prototype/lowering_predicates.dart';
 import 'package:kernel/core_types.dart';
-import 'package:kernel/kernel.dart';
+import 'package:kernel/kernel.dart' hide Pattern;
 import 'package:kernel/target/targets.dart';
 
 import 'src/js_interop.dart';

pkg/dart2wasm/lib/code_generator.dart

@@ -3293,6 +3293,27 @@ class CodeGenerator extends ExpressionVisitor1<w.ValueType, w.ValueType>
 
   void _emitString(String str) => wrap(StringLiteral(str),
       translator.translateType(translator.coreTypes.stringNonNullableRawType));
+
+  @override
+  void visitPatternSwitchStatement(PatternSwitchStatement node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw new UnsupportedError("CodeGenerator.visitPatternSwitchStatement");
+  }
+
+  @override
+  void visitPatternVariableDeclaration(PatternVariableDeclaration node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw new UnsupportedError("CodeGenerator.visitPatternVariableDeclaration");
+  }
+
+  @override
+  void visitIfCaseStatement(IfCaseStatement node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw new UnsupportedError("CodeGenerator.visitIfCaseStatement");
+  }
 }
 
 class TryBlockFinalizer {

pkg/dev_compiler/lib/src/kernel/compiler.dart

@@ -7385,6 +7385,42 @@ class ProgramCompiler extends ComputeOnceConstantVisitor<js_ast.Expression>
     ];
     return header;
   }
+
+  @override
+  js_ast.Statement visitIfCaseStatement(IfCaseStatement node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw UnsupportedError('ProgramCompiler.visitIfCaseStatement');
+  }
+
+  @override
+  js_ast.Expression visitPatternAssignment(PatternAssignment node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw UnsupportedError('ProgramCompiler.visitPatternAssignment');
+  }
+
+  @override
+  js_ast.Statement visitPatternSwitchStatement(PatternSwitchStatement node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw UnsupportedError('ProgramCompiler.visitPatternSwitchStatement');
+  }
+
+  @override
+  js_ast.Statement visitPatternVariableDeclaration(
+      PatternVariableDeclaration node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw UnsupportedError('ProgramCompiler.visitPatternVariableDeclaration');
+  }
+
+  @override
+  js_ast.Expression visitSwitchExpression(SwitchExpression node) {
+    // This node is internal to the front end and removed by the constant
+    // evaluator.
+    throw UnsupportedError('ProgramCompiler.visitSwitchExpression');
+  }
 }
 
 bool _isInlineJSFunction(Statement? body) {

pkg/dev_compiler/lib/src/kernel/kernel_helpers.dart

@@ -5,7 +5,7 @@
 import 'dart:collection';
 import 'package:collection/collection.dart';
 import 'package:kernel/core_types.dart';
-import 'package:kernel/kernel.dart';
+import 'package:kernel/kernel.dart' hide Pattern;
 
 Constructor? unnamedConstructor(Class c) =>
     c.constructors.firstWhereOrNull((c) => c.name.text == '');

pkg/dev_compiler/lib/src/kernel/target.dart

@@ -11,7 +11,7 @@ import 'package:_js_interop_checks/src/transformations/export_creator.dart';
 import 'package:_js_interop_checks/src/transformations/js_util_optimizer.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:kernel/core_types.dart';
-import 'package:kernel/kernel.dart';
+import 'package:kernel/kernel.dart' hide Pattern;
 import 'package:kernel/reference_from_index.dart';
 import 'package:kernel/target/changed_structure_notifier.dart';
 import 'package:kernel/target/targets.dart';