Deprecate UnlinkedVariable.visibleOffset/Length.

pkg/analyzer/lib/src/dart/element/element.dart

 // Copyright (c) 2014, 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 analyzer.src.dart.element.element;
 
 import 'dart:collection';
 import 'dart:math' show min;
 
 import 'package:analyzer/dart/ast/ast.dart';
@@ skipping 6288 matching lines @@
   bool get isPotentiallyMutatedInClosure => true;
 
   @override
   bool get isPotentiallyMutatedInScope => true;
 
   @override
   ElementKind get kind => ElementKind.LOCAL_VARIABLE;
 
   @override
   SourceRange get visibleRange {
-    if (_unlinkedVariable != null) {
-      if (_unlinkedVariable.visibleLength == 0) {
-        return null;
-      }
-      return new SourceRange(
-          _unlinkedVariable.visibleOffset, _unlinkedVariable.visibleLength);
-    }
     if (_visibleRangeLength < 0) {
       return null;
     }
     return new SourceRange(_visibleRangeOffset, _visibleRangeLength);
   }
 
   @override
   T accept<T>(ElementVisitor<T> visitor) =>
       visitor.visitLocalVariableElement(this);
 
   @override
   void appendTo(StringBuffer buffer) {
     buffer.write(type);
     buffer.write(" ");
     buffer.write(displayName);
   }
 
   @override
   Declaration computeNode() => getNodeMatching(
       (node) => node is DeclaredIdentifier || node is VariableDeclaration);
 
   /**
    * Set the visible range for this element to the range starting at the given
    * [offset] with the given [length].
    */
   void setVisibleRange(int offset, int length) {
-    _assertNotResynthesized(_unlinkedVariable);
     _visibleRangeOffset = offset;
     _visibleRangeLength = length;
   }
 }
 
 /**
  * A concrete implementation of a [MethodElement].
  */
 class MethodElementImpl extends ExecutableElementImpl implements MethodElement {
   /**
@@ skipping 2519 matching lines @@
 
   @override
   DartObject computeConstantValue() => null;
 
   @override
   void visitChildren(ElementVisitor visitor) {
     super.visitChildren(visitor);
     _initializer?.accept(visitor);
   }
 }