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

pkg/front_end/lib/src/fasta/builder/procedure_builder.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.procedure_builder;
 
 // Note: we're deliberately using AsyncMarker and ProcedureKind from kernel
 // outside the kernel-specific builders. This is simpler than creating
 // additional enums.
 import 'package:kernel/ast.dart' show
     AsyncMarker,
     ProcedureKind;
 
 import 'builder.dart' show
     Builder,
     FormalParameterBuilder,
+    LibraryBuilder,
     MemberBuilder,
     MetadataBuilder,
     TypeBuilder,
     TypeVariableBuilder;
 
 import 'scope.dart' show
     Scope;
 
 abstract class ProcedureBuilder<T extends TypeBuilder> extends MemberBuilder {
   final List<MetadataBuilder> metadata;
 
   final int modifiers;
 
   final T returnType;
 
   final String name;
 
   final List<TypeVariableBuilder> typeVariables;
 
   final List<FormalParameterBuilder> formals;
 
   ProcedureBuilder(this.metadata, this.modifiers, this.returnType, this.name,
-      this.typeVariables, this.formals);
+      this.typeVariables, this.formals, LibraryBuilder compilationUnit,
+      int charOffset)
+      : super(compilationUnit, charOffset);
 
   AsyncMarker get asyncModifier;
 
   ProcedureKind get kind;
 
   bool get isConstructor => false;
 
   bool get isRegularMethod => identical(ProcedureKind.Method, kind);
 
   bool get isGetter => identical(ProcedureKind.Getter, kind);
@@ skipping 24 matching lines @@
   /// to support generic methods.
   Scope computeTypeParameterScope(Scope parent) {
     if (typeVariables == null) return parent;
     Map<String, Builder> local = <String, Builder>{};
     for (TypeVariableBuilder variable in typeVariables) {
       local[variable.name] = variable;
     }
     return new Scope(local, parent, isModifiable: false);
   }
 }