Recover from read errors.

dart/pkg/compiler/lib/src/compiler.dart

Index: dart/pkg/compiler/lib/src/compiler.dart
diff --git a/dart/pkg/compiler/lib/src/compiler.dart b/dart/pkg/compiler/lib/src/compiler.dart
index c6fc23abdec20b5e700f67a43c99cc5172fead9e..dbf06e4f2fb3a86f89de6a5c6ab3dbf7228bcc4c 100644
--- a/dart/pkg/compiler/lib/src/compiler.dart
+++ b/dart/pkg/compiler/lib/src/compiler.dart
@@ -1378,7 +1378,8 @@ abstract class Compiler implements DiagnosticListener {
     _coreTypes.iterableClass = lookupCoreClass('Iterable');
     _coreTypes.symbolClass = lookupCoreClass('Symbol');
     if (!missingCoreClasses.isEmpty) {
-      internalError(coreLibrary,
+      internalError(
+          coreLibrary,
           'dart:core library does not contain required classes: '
           '$missingCoreClasses');
     }
@@ -1437,11 +1438,7 @@ abstract class Compiler implements DiagnosticListener {
         });
       }
     }).then((_) {
-      if (!compilationFailed) {
-        // TODO(johnniwinther): Reenable analysis of programs with load failures
-        // when these are handled as erroneous libraries/compilation units.
-        compileLoadedLibraries();
-      }
+      compileLoadedLibraries();
     });
   }
 
@@ -1504,7 +1501,9 @@ abstract class Compiler implements DiagnosticListener {
         mainFunction = errorElement;
       }
     }
-    if (errorElement != null && errorElement.isSynthesized) {
+    if (errorElement != null &&
+        errorElement.isSynthesized &&
+        !mainApp.isSynthesized) {
       reportWarning(
           errorElement, errorElement.messageKind,
           errorElement.messageArguments);
@@ -1924,6 +1923,13 @@ abstract class Compiler implements DiagnosticListener {
     return null;
   }
 
+  /// Compatible with [readScript] and used by [LibraryLoader] to create
+  /// synthetic scripts to recover from read errors and bad URIs.
+  Future<Script> synthesizeScript(Spannable node, Uri readableUri) {
+    unimplemented(node, 'Compiler.synthesizeScript');
+    return null;
+  }
+
   Element lookupElementIn(ScopeContainerElement container, String name) {
     Element element = container.localLookup(name);
     if (element == null) {