Set fileUri when creating library builders.

pkg/front_end/lib/src/fasta/kernel/kernel_target.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 fasta.kernel_target;
 
 import 'dart:async' show
     Future;
 
 import 'dart:io' show
@@ skipping 93 matching lines @@
       : dillTarget = dillTarget,
         super(dillTarget.ticker, uriTranslator) {
     resetCrashReporting();
     loader = new SourceLoader<Library>(this);
   }
 
   void read(Uri uri) {
     loader.read(uri);
   }
 
-  LibraryBuilder createLibraryBuilder(Uri uri) {
+  LibraryBuilder createLibraryBuilder(Uri uri, Uri fileUri) {
     if (dillTarget.isLoaded) {
       var builder = dillTarget.loader.builders[uri];
       if (builder != null) {
         return builder;
       }
     }
-    return new KernelLibraryBuilder(uri, loader);
+    return new KernelLibraryBuilder(uri, fileUri, loader);
   }
 
   void addDirectSupertype(ClassBuilder cls, Set<ClassBuilder> set) {
     if (cls == null) return;
     TypeBuilder supertype = cls.supertype;
     add(InterfaceTypeBuilder type) {
       Builder builder = type.builder;
       if (builder is ClassBuilder) {
         set.add(builder);
       } else if (builder is! InvalidTypeBuilder &&
@@ skipping 128 matching lines @@
       return await writeLinkedProgram(uri, program, isFullProgram: false);
     } on InputError catch (e) {
       return handleInputError(uri, e, isFullProgram: false);
     } catch (e, s) {
       return reportCrash(e, s, loader?.currentUriForCrashReporting);
     }
   }
 
   Program erroneousProgram(bool isFullProgram) {
     Uri uri = loader.first?.uri ?? Uri.parse("error:error");
-    KernelLibraryBuilder library = new KernelLibraryBuilder(uri, loader);
+    Uri fileUri = loader.first?.fileUri ?? uri;
+    KernelLibraryBuilder library =
+        new KernelLibraryBuilder(uri, fileUri, loader);
     loader.first = library;
     if (isFullProgram) {
       // If this is an outline, we shouldn't add an executable main
       // method. Similarly considerations apply to separate compilation. It
       // could also make sense to add a way to mark .dill files as having
       // compile-time errors.
       KernelProcedureBuilder mainBuilder = new KernelProcedureBuilder(null, 0,
           null, "main", null, null, AsyncMarker.Sync, ProcedureKind.Method);
       library.addBuilder(mainBuilder.name, mainBuilder);
       mainBuilder.body = new ExpressionStatement(
@@ skipping 304 matching lines @@
     superclass = superclass.superclass;
   }
   for (Constructor constructor in superclass.constructors) {
     if (constructor.name.name.isEmpty) {
       return constructor.function.requiredParameterCount == 0 ?
           constructor : null;
     }
   }
   return null;
 }