Remove BlockExpression from the Kernel language.

lib/text/ast_to_text.dart

 // Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 library kernel.ast_to_text;
 
 import '../ast.dart';
 import '../import_table.dart';
 import '../type_propagation/type_propagation.dart';
 
 class Namer<T> {
@@ skipping 951 matching lines @@
     writeWord('null');
   }
 
   visitLet(Let node) {
     writeWord('let');
     writeVariableDeclaration(node.variable);
     writeSpaced('in');
     writeExpression(node.body);
   }
 
-  visitBlockExpression(BlockExpression node) {
-    int savedColumn = column;
-
-    var savedState = state;
-    int savedIndentation = indentation;
-    String spaces = ' ' * savedColumn;
-
-    writeWord('|{');
-    endLine();
-    state = SPACE;
-    indentation = (savedColumn + 4) ~/ 2;
-    for (var statement in node.body.statements) {
-      statement.accept(this);
-    }
-    write('$spaces   => ');
-    writeExpression(node.value);
-    endLine();
-    write('$spaces');
-
-    indentation = savedIndentation;
-    state = savedState;
-    column = savedColumn;
-
-    write('}|');
-  }
-
   defaultExpression(Expression node) {
     writeWord('${node.runtimeType}');
   }
 
   visitVariableGet(VariableGet node) {
     writeVariableReference(node.variable);
   }
 
   visitVariableSet(VariableSet node) {
     writeVariableReference(node.variable);
@@ skipping 516 matching lines @@
   int visitVariableSet(VariableSet node) => EXPRESSION;
   int visitPropertyGet(PropertyGet node) => PRIMARY;
   int visitPropertySet(PropertySet node) => EXPRESSION;
   int visitSuperPropertyGet(SuperPropertyGet node) => PRIMARY;
   int visitSuperPropertySet(SuperPropertySet node) => EXPRESSION;
   int visitDirectPropertyGet(DirectPropertyGet node) => PRIMARY;
   int visitDirectPropertySet(DirectPropertySet node) => EXPRESSION;
   int visitStaticGet(StaticGet node) => PRIMARY;
   int visitStaticSet(StaticSet node) => EXPRESSION;
   int visitLet(Let node) => EXPRESSION;
-  int visitBlockExpression(BlockExpression node) => EXPRESSION;
 }
 
 String procedureKindToString(ProcedureKind kind) {
   switch (kind) {
     case ProcedureKind.Method:
       return 'method';
     case ProcedureKind.Getter:
       return 'get';
     case ProcedureKind.Setter:
       return 'set';
     case ProcedureKind.Operator:
       return 'operator';
     case ProcedureKind.Factory:
       return 'factory';
   }
   throw 'illegal ProcedureKind: $kind';
 }
 
 class ExpressionPrinter {
   final Printer writeer;
   final int minimumPrecedence;
 
   ExpressionPrinter(this.writeer, this.minimumPrecedence);
 }