Stop using the Hashable interface.

lib/compiler/implementation/elements/elements.dart

 // Copyright (c) 2012, 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('elements');
 
 #import('dart:uri');
 
 #import('../tree/tree.dart');
 #import('../scanner/scannerlib.dart');
@@ skipping 89 matching lines @@
   static const ElementKind STATEMENT =
     const ElementKind('statement', ElementCategory.NONE);
   static const ElementKind LABEL =
     const ElementKind('label', ElementCategory.NONE);
   static const ElementKind VOID =
     const ElementKind('void', ElementCategory.NONE);
 
   toString() => id;
 }
 
-class Element implements Hashable, Spannable {
+class Element implements Spannable {
   final SourceString name;
   final ElementKind kind;
   final Element enclosingElement;
   Link<MetadataAnnotation> metadata = const EmptyLink<MetadataAnnotation>();
 
   Element(this.name, this.kind, this.enclosingElement) {
     assert(getLibrary() !== null);
   }
 
   Modifiers get modifiers => null;
@@ skipping 1568 matching lines @@
     if (value === '>>=') return const SourceString('>>');
     if (value === '&=') return const SourceString('&');
     if (value === '^=') return const SourceString('^');
     if (value === '|=') return const SourceString('|');
 
     throw 'Unhandled operator: ${op.slowToString()}';
   }
 
   static bool isNumberOrStringSupertype(Element element, Compiler compiler) {
     LibraryElement coreLibrary = compiler.coreLibrary;
-    return (element == coreLibrary.find(const SourceString('Comparable')))
-        || (element == coreLibrary.find(const SourceString('Hashable')));
+    return (element == coreLibrary.find(const SourceString('Comparable')));
   }
 
   static bool isStringOnlySupertype(Element element, Compiler compiler) {
     LibraryElement coreLibrary = compiler.coreLibrary;
     return element == coreLibrary.find(const SourceString('Pattern'));
   }
 
   static bool isListSupertype(Element element, Compiler compiler) {
     LibraryElement coreLibrary = compiler.coreLibrary;
     return (element == coreLibrary.find(const SourceString('Collection')))
@@ skipping 120 matching lines @@
 
   MetadataAnnotation ensureResolved(Compiler compiler) {
     if (resolutionState == STATE_NOT_STARTED) {
       compiler.resolver.resolveMetadataAnnotation(this);
     }
     return this;
   }
 
   String toString() => 'MetadataAnnotation($value, $resolutionState)';
 }