Implement line and column numbers.

pkg/kernel/lib/ast.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.
 
 /// -----------------------------------------------------------------------
 ///                           ERROR HANDLING
 /// -----------------------------------------------------------------------
 ///
 /// As a rule of thumb, errors that can be detected statically are handled by
 /// the frontend, typically by translating the erroneous code into a 'throw' or
@@ skipping 3591 matching lines @@
   /// Given a source file uri and a offset in that file one can translate
   /// it to a line:column position in that file.
   final Map<String, Source> uriToSource;
 
   /// Reference to the main method in one of the libraries.
   Procedure mainMethod;
 
   Program([List<Library> libraries, Map<String, Source> uriToSource])
       : libraries = libraries ?? <Library>[],
         uriToSource = uriToSource ?? <String, Source>{} {
-    setParents(libraries, this);
+    setParents(this.libraries, this);
   }
 
   accept(TreeVisitor v) => v.visitProgram(this);
 
   visitChildren(Visitor v) {
     visitList(libraries, v);
     mainMethod?.acceptReference(v);
   }
 
   transformChildren(Transformer v) {
@@ skipping 122 matching lines @@
     }
   }
 }
 
 class Source {
   final List<int> lineStarts;
   final String source;
 
   Source(this.lineStarts, this.source);
 }