Ensure locations are always provided, but don't store them yet.

pkg/front_end/lib/src/fasta/kernel/builder_accessors.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.builder_accessors;
 
 export 'frontend_accessors.dart' show
     wrapInvalid;
 
 import 'frontend_accessors.dart' show
@@ skipping 322 matching lines @@
       return receiver.buildPropertyAccess(this, isNullAware);
     }
     if (receiver is PrefixBuilder) {
       PrefixBuilder prefix = receiver;
       receiver = helper.builderToFirstExpression(
           prefix.exports[name.name], "${prefix.name}.${name.name}", charOffset);
       return helper.finishSend(receiver, arguments, charOffset);
     }
     Expression result;
     if (receiver is KernelClassBuilder) {
-      Builder builder = receiver.findStaticBuilder(name.name);
+      Builder builder = receiver.findStaticBuilder(name.name, charOffset, uri);
       if (builder == null) {
         return buildThrowNoSuchMethodError(arguments);
       }
       if (builder.hasProblem) {
         result = helper.buildProblemExpression(builder, name.name);
       } else {
         Member target = builder.target;
         if (target != null) {
           if (target is Field) {
             result = buildMethodInvocation(new StaticGet(target),
@@ skipping 61 matching lines @@
     }
     if (receiver is BuilderAccessor) {
       return receiver.buildPropertyAccess(this, isNullAware);
     }
     if (receiver is PrefixBuilder) {
       PrefixBuilder prefix = receiver;
       return helper.builderToFirstExpression(
           prefix.exports[name.name], name.name, charOffset);
     }
     if (receiver is KernelClassBuilder) {
-      Builder builder = receiver.findStaticBuilder(name.name);
+      Builder builder = receiver.findStaticBuilder(name.name, charOffset, uri);
       Member getter = builder?.target;
       Member setter;
       if (builder == null) {
-        builder = receiver.findStaticBuilder(name.name, isSetter: true);
+        builder = receiver.findStaticBuilder(
+            name.name, charOffset, uri, isSetter: true);
         if (builder == null) {
           return buildThrowNoSuchMethodError(null);
         }
       }
       if (builder.hasProblem) {
         return helper.buildProblemExpression(builder, name.name)
             ..fileOffset = charOffset;
       }
       if (getter is Field) {
         if (!getter.isFinal && !getter.isConst) {
           setter = getter;
         }
       } else if (getter is Procedure) {
         if (getter.isGetter) {
-          builder = receiver.findStaticBuilder(name.name, isSetter: true);
+          builder = receiver.findStaticBuilder(
+              name.name, charOffset, uri, isSetter: true);
           if (builder != null && !builder.hasProblem) {
             setter = builder.target;
           }
         }
       }
       if (getter == null) {
         return internalError("no getter for $name");
       }
       return new StaticAccessor(helper, charOffset, getter, setter);
     }
@@ skipping 266 matching lines @@
             buildIsNull(new VariableGet(variable)),
             new NullLiteral(),
             new MethodInvocation(new VariableGet(variable), name, arguments)
                 ..fileOffset = charOffset,
             const DynamicType()));
   } else {
     return new MethodInvocation(receiver, name, arguments)
         ..fileOffset = charOffset;
   }
 }