Skip unresolved functions in NoSuchMethodRegistry

pkg/compiler/lib/src/js_backend/no_such_method_registry.dart

 // Copyright (c) 2015, 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.
 
 part of js_backend;
 
 /**
  * Categorizes `noSuchMethod` implementations.
  *
  * If user code includes `noSuchMethod` implementations, type inference is
@@ skipping 175 matching lines @@
     ClassElement classElement = element.enclosingClass;
     return classElement == _compiler.coreClasses.objectClass ||
         classElement == _backend.helpers.jsInterceptorClass ||
         classElement == _backend.helpers.jsNullClass;
   }
 
   bool _hasForwardingSyntax(FunctionElement element) {
     // At this point we know that this is signature-compatible with
     // Object.noSuchMethod, but it may have more than one argument as long as
     // it only has one required argument.
+    if (!element.hasResolvedAst) {
+      // TODO(johnniwinther): Why do we see unresolved elements here?
+      return false;
+    }
+    ResolvedAst resolvedAst = element.resolvedAst;
+    if (resolvedAst.kind != ResolvedAstKind.PARSED) {
+      return false;
+    }
     String param = element.parameters.first.name;
-    Statement body = element.node.body;
+    Statement body = resolvedAst.body;
     Expression expr;
     if (body is Return && body.isArrowBody) {
       expr = body.expression;
     } else if (body is Block &&
         !body.statements.isEmpty &&
         body.statements.nodes.tail.isEmpty) {
       Statement stmt = body.statements.nodes.head;
       if (stmt is Return && stmt.hasExpression) {
         expr = stmt.expression;
       }
@@ skipping 16 matching lines @@
           arg.receiver == null &&
           arg.selector is Identifier &&
           arg.selector.source == param) {
         return true;
       }
     }
     return false;
   }
 
   bool _hasThrowingSyntax(FunctionElement element) {
-    Statement body = element.node.body;
+    if (!element.hasResolvedAst) {
+      // TODO(johnniwinther): Why do we see unresolved elements here?
+      return false;
+    }
+    ResolvedAst resolvedAst = element.resolvedAst;
+    if (resolvedAst.kind != ResolvedAstKind.PARSED) {
+      return false;
+    }
+    Statement body = resolvedAst.body;
     if (body is Return && body.isArrowBody) {
       if (body.expression is Throw) {
         return true;
       }
     } else if (body is Block &&
         !body.statements.isEmpty &&
         body.statements.nodes.tail.isEmpty) {
       if (body.statements.nodes.head is ExpressionStatement) {
         ExpressionStatement stmt = body.statements.nodes.head;
         return stmt.expression is Throw;
       }
     }
     return false;
   }
 }
 
 enum NsmCategory { DEFAULT, THROWING, NOT_APPLICABLE, OTHER, }