AST nodes for function-typed parameters.

dart/frog/leg/tree/nodes.dart

 // Copyright (c) 2011, 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.
 
 interface Visitor<R> {
   R visitBlock(Block node);
   R visitBreakStatement(BreakStatement node);
   R visitCatchBlock(CatchBlock node);
   R visitClassNode(ClassNode node);
   R visitConditional(Conditional node);
@@ skipping 65 matching lines @@
   abstract visitChildren(Visitor visitor);
 
   toString() => unparse();
 
   String getObjectDescription() => super.toString();
 
   String unparse() {
     Unparser unparser = new Unparser();
     try {
       return unparser.unparse(this);
-    } catch (var e) {
+    } catch (var e, var trace) {
+      print(trace);
       return '<<unparse error: ${getObjectDescription()}: ${unparser.sb}>>';
     }
   }
 
   abstract Token getBeginToken();
 
   abstract Token getEndToken();
 
   Block asBlock() => null;
   BreakStatement asBreakStatement() => null;
@@ skipping 419 matching lines @@
     if (name !== null) name.accept(visitor);
     if (parameters !== null) parameters.accept(visitor);
     if (body !== null) body.accept(visitor);
     if (returnType !== null) returnType.accept(visitor);
   }
 
   Token getBeginToken() {
     return firstBeginToken(returnType, name);
   }
 
-  Token getEndToken() => body.getEndToken();
+  Token getEndToken() {
+    return (body === null) ? parameters.getEndToken() : body.getEndToken();
+  }
 }
 
 typedef void DecodeErrorHandler(Token token, var error);
 
 class Literal<T> extends Expression {
   final Token token;
   final DecodeErrorHandler handler;
 
   Literal(Token this.token, DecodeErrorHandler this.handler);
 
@@ skipping 689 matching lines @@
 
   visitChildren(Visitor visitor) {
     formals.accept(visitor);
     block.accept(visitor);
   }
 
   Token getBeginToken() => catchKeyword;
 
   Token getEndToken() => block.getEndToken();
 }