Implement line and column numbers.

pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart

Index: pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
diff --git a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
index 1f9ca9de5881d0ae533a1df161302bb7472159fa..f546cf124e870f022945d7f7c973da2cea9ae9e5 100644
--- a/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
+++ b/pkg/front_end/lib/src/fasta/analyzer/ast_builder.dart
@@ -53,10 +53,12 @@ class AstBuilder extends ScopeListener {
 
   bool isFirstIdentifier = false;
 
-  AstBuilder(this.library, this.member, this.elementStore, Scope scope)
-      : super(scope);
+  @override
+  final Uri uri;
 
-  Uri get uri => library.fileUri ?? library.uri;
+  AstBuilder(this.library, this.member, this.elementStore, Scope scope,
+      [Uri uri])
+      : uri = uri ?? library.fileUri, super(scope);
 
   createJumpTarget(JumpTargetKind kind, int charOffset) {
     // TODO(ahe): Implement jump targets.