diff --git a/compiler/kernel-primitives.rkt b/compiler/kernel-primitives.rkt
index 472cd09..d207226 100644
--- a/compiler/kernel-primitives.rkt
+++ b/compiler/kernel-primitives.rkt
@@ -93,7 +93,8 @@
                                     'make-hash
                                     'make-hasheqv
                                     'make-hasheq
-                                    
+                                    'hash-ref
+                                    'hash-set!
                                     ))
 (define-predicate KernelPrimitiveName? KernelPrimitiveName)
 
diff --git a/js-assembler/runtime-src/baselib-boxes.js b/js-assembler/runtime-src/baselib-boxes.js
index 023ea0b..7f495ab 100644
--- a/js-assembler/runtime-src/baselib-boxes.js
+++ b/js-assembler/runtime-src/baselib-boxes.js
@@ -59,6 +59,15 @@
         return ((other instanceof Box) &&
 	        baselib.equality.equals(this.val, other.val, aUnionFind));
     };
+
+    Box.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("Box");
+        k = baselib.hashes.hashMix(k);
+        k += baselib.hashes.getEqualHashCode(this.val, depth);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
+
     
     var makeBox = function(x) { 
         return new Box(x, true); 
diff --git a/js-assembler/runtime-src/baselib-bytes.js b/js-assembler/runtime-src/baselib-bytes.js
index 507e0dd..a8500c2 100644
--- a/js-assembler/runtime-src/baselib-bytes.js
+++ b/js-assembler/runtime-src/baselib-bytes.js
@@ -60,6 +60,16 @@
         return true;
     };
 
+    Bytes.prototype.hashCode = function(depth) {
+        var i;
+        var k = baselib.hashes.getEqualHashCode('Bytes');
+        for (i = 0; i < n; i++) {
+            k += this.bytes[i];
+            k = baselib.hashes.hashMix(k);
+        }
+        return k;
+    };
+
 
     Bytes.prototype.toString = function(cache) {
 	var ret = [], i;
diff --git a/js-assembler/runtime-src/baselib-chars.js b/js-assembler/runtime-src/baselib-chars.js
index de6bf90..d3a999d 100644
--- a/js-assembler/runtime-src/baselib-chars.js
+++ b/js-assembler/runtime-src/baselib-chars.js
@@ -67,7 +67,12 @@
         return other instanceof Char && this.val == other.val;
     };
 
-
+    Char.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode('Char');
+        k += this.val.charCodeAt(0);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
 
 
     exports.Char = Char;
diff --git a/js-assembler/runtime-src/baselib-hashes.js b/js-assembler/runtime-src/baselib-hashes.js
index 9f5a354..aa59f33 100644
--- a/js-assembler/runtime-src/baselib-hashes.js
+++ b/js-assembler/runtime-src/baselib-hashes.js
@@ -61,7 +61,7 @@
         return new WhalesongHashtable(
             "hash",
             function (x) {
-                return baselib.format.toWrittenString(x); 
+                return getEqualHashCode(x); 
             },
             function (x, y) {
                 return baselib.equality.equals(x, y, new baselib.UnionFind()); 
@@ -72,7 +72,7 @@
         return new WhalesongHashtable(
             "hasheqv",
             function (x) {
-                return baselib.format.toWrittenString(x); 
+                return getEqHashCode(x);
             },
             baselib.equality.eqv);
     };
@@ -134,7 +134,14 @@
         return true;
     };
 
-
+    WhalesongHashtable.prototype.hashCode = function(depth) {
+        var k = getEqualHashCode(this.type);
+        var keys = this.hash.keys(), i;
+        for (i = 0; i < keys.length; i++) {
+            k += hashMix(getEqualHashCode(this.hash.get(keys[i]), depth));
+        }
+        return hashMix(k);
+    };
 
 
 
@@ -159,9 +166,63 @@
     };
 
 
+
+
+
+
+
+
+    // Arbitrary magic number.  We have to cut off the hashing at some point.
+    var MAX_HASH_DEPTH = 128;
+
+    // Returns a JavaScript number.
+    var getEqualHashCode = function (x, depth) {
+        var i, t, k = 0;
+        if (depth === undefined) { depth = 0; }
+
+        if (depth > MAX_HASH_DEPTH) { return 0; }
+
+        if (baselib.numbers.isNumber(x)) {
+            return hashMix(baselib.numbers.toFixnum(x));
+        }
+
+        if (baselib.strings.isString(x)) {
+            t = x.toString();
+            for (i = 0; i < t.length; i++) {
+                k += t.charCodeAt(i);
+                k = hashMix(k);
+            }
+            return k;
+        }
+
+        if (x === undefined || x === null) {
+            return 1;
+        }
+
+        if (typeof (x) === 'object' && typeof (y) === 'object' &&
+            typeof(x.hashCode) === 'function') {
+            return x.hashCode(depth + 1);
+        }
+        return 0;
+    };
+
+
+    // Does some weird math on k.  Grabbed from Racket's implementation of hashes.
+    // References to: http://www.burtleburtle.net/bob/hash/doobs.html
+    var hashMix = function(k) {
+        k += (k << 10);
+        k ^= (k >> 6);
+        return k;
+    };
+
+
+
     //////////////////////////////////////////////////////////////////////
 
     exports.getEqHashCode = getEqHashCode;
+    exports.getEqualHashCode = getEqualHashCode;
+    exports.hashMix = hashMix;
+
     exports.makeEqHashCode = makeEqHashCode;
     exports.makeLowLevelEqHash = makeLowLevelEqHash;
 
diff --git a/js-assembler/runtime-src/baselib-keywords.js b/js-assembler/runtime-src/baselib-keywords.js
index 36068b3..0e70644 100644
--- a/js-assembler/runtime-src/baselib-keywords.js
+++ b/js-assembler/runtime-src/baselib-keywords.js
@@ -27,6 +27,13 @@
         return other instanceof Keyword &&
             this.val === other.val;
     };
+
+    Keyword.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("Keyword");
+        k += baselib.hashes.getEqualHashCode(this.val, depth);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
     
 
     Keyword.prototype.toString = function (cache) {
diff --git a/js-assembler/runtime-src/baselib-lists.js b/js-assembler/runtime-src/baselib-lists.js
index c18e571..b6ae8fd 100644
--- a/js-assembler/runtime-src/baselib-lists.js
+++ b/js-assembler/runtime-src/baselib-lists.js
@@ -20,6 +20,11 @@
         return other instanceof Empty;
     };
 
+    Empty.prototype.hashCode = function(depth) {
+        return baselib.hashes.getEqualHashCode("empty");
+    };
+
+
     Empty.prototype.reverse = function () {
         return this;
     };
@@ -85,6 +90,16 @@
                 baselib.equality.equals(this.rest, other.rest, aUnionFind));
     };
 
+    Cons.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("Cons");
+        k += baselib.hashes.getEqualHashCode(this.first);
+        k = baselib.hashes.hashMix(k);
+        k += baselib.hashes.getEqualHashCode(this.rest);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
+
+
 
     // Cons.append: (listof X) -> (listof X)
     Cons.prototype.append = function (b) {
diff --git a/js-assembler/runtime-src/baselib-paths.js b/js-assembler/runtime-src/baselib-paths.js
index 02ebfd8..231b6f0 100644
--- a/js-assembler/runtime-src/baselib-paths.js
+++ b/js-assembler/runtime-src/baselib-paths.js
@@ -16,6 +16,20 @@
         return "#<path:" + String(this.path) + ">";
     };
 
+
+    Path.prototype.equals = function(other, aUnionFind) {
+        return (other instanceof Path &&
+                this.path === other.path);
+    };
+
+    Path.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("path");
+        k += baselib.hashes.getEqualHashCode(this.path, depth);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
+
+
     //////////////////////////////////////////////////////////////////////
 
     var makePath = function (p) {
diff --git a/js-assembler/runtime-src/baselib-placeholders.js b/js-assembler/runtime-src/baselib-placeholders.js
index 1ea581d..4c9fd52 100644
--- a/js-assembler/runtime-src/baselib-placeholders.js
+++ b/js-assembler/runtime-src/baselib-placeholders.js
@@ -43,6 +43,12 @@
                 baselib.equality.equals(this.val, other.val, aUnionFind));
     };
 
+    Placeholder.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.hashCode("Placeholder");
+        k += baselib.hashes.hashCode(this.val, depth);
+        return baselib.hashes.hashMix(k);
+    };
+
 
     var makePlaceholder = function(v) {
         return new Placeholder(v);
diff --git a/js-assembler/runtime-src/baselib-primitives.js b/js-assembler/runtime-src/baselib-primitives.js
index f24d611..e9ce002 100644
--- a/js-assembler/runtime-src/baselib-primitives.js
+++ b/js-assembler/runtime-src/baselib-primitives.js
@@ -61,6 +61,7 @@
 
     // Exceptions and error handling.
     var raise = baselib.exceptions.raise;
+    var raiseContractError = baselib.exceptions.raiseContractError;
     var raiseArgumentTypeError = baselib.exceptions.raiseArgumentTypeError;
     var raiseArityMismatchError = baselib.exceptions.raiseArityMismatchError;
 
@@ -2558,13 +2559,14 @@
             } else {
                 if (M.a === 2) {
                     raiseContractError(
-                        plt.baselib.format("hash-ref: no value found for key: ~e",
+                        M,
+                        baselib.format.format("hash-ref: no value found for key: ~e",
                                            [key]));
                 } else {                    
                     M.p = thunk;
                     M.e.length -= M.a;
                     M.a = 0;
-                    baselib.functions.rawApply();
+                    baselib.functions.rawApply(M);
                 }
             }
         });
diff --git a/js-assembler/runtime-src/baselib-strings.js b/js-assembler/runtime-src/baselib-strings.js
index 23c3fbe..a22dbc5 100644
--- a/js-assembler/runtime-src/baselib-strings.js
+++ b/js-assembler/runtime-src/baselib-strings.js
@@ -107,6 +107,10 @@
 	return this.toString() === other.toString();
     };
 
+    Str.prototype.hashCode = function(depth) {
+        return baselib.hashes.getEqualHashCode(this.toString());
+    };
+
 
     Str.prototype.set = function (i, c) {
 	this.chars[i] = c;
diff --git a/js-assembler/runtime-src/baselib-structs.js b/js-assembler/runtime-src/baselib-structs.js
index cfa0455..29c89c8 100644
--- a/js-assembler/runtime-src/baselib-structs.js
+++ b/js-assembler/runtime-src/baselib-structs.js
@@ -60,6 +60,18 @@
         return true;
     };
 
+    Struct.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode(this.name);
+        var i;
+        k = baselib.hashes.hashMix(k);
+        for (i = 0; i < this._fields.length; i++) {
+            k += baselib.hashes.getEqualHashCode(this._fields[i]);
+            k = baselib.hashes.hashMix(k);
+        }
+        return k;
+    };
+
+
     Struct.prototype.type = Struct;
 
 
@@ -101,6 +113,13 @@
         return this === other;
     };
 
+    StructType.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("StructType");
+        k = baselib.hashes.hashMix(k);
+        k += baselib.hashes.getEqualHashCode(this.name);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
 
 
 
diff --git a/js-assembler/runtime-src/baselib-symbols.js b/js-assembler/runtime-src/baselib-symbols.js
index 1c20530..41d6841 100644
--- a/js-assembler/runtime-src/baselib-symbols.js
+++ b/js-assembler/runtime-src/baselib-symbols.js
@@ -30,6 +30,14 @@
         return other instanceof Symbol &&
             this.val === other.val;
     };
+
+    Symbol.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("Symbol");
+        k = baselib.hashes.hashMix(k);
+        k += baselib.hashes.getEqualHashCode(this.val);
+        k = baselib.hashes.hashMix(k);
+        return k;
+    };
     
 
     Symbol.prototype.toString = function (cache) {
diff --git a/js-assembler/runtime-src/baselib-vectors.js b/js-assembler/runtime-src/baselib-vectors.js
index 11030f8..c9d600d 100644
--- a/js-assembler/runtime-src/baselib-vectors.js
+++ b/js-assembler/runtime-src/baselib-vectors.js
@@ -56,6 +56,17 @@
         }
     };
 
+    Vector.prototype.hashCode = function(depth) {
+        var k = baselib.hashes.getEqualHashCode("Vector");
+        var i;
+        k = baselib.hashes.hashMix(k);
+        for (i = 0; i < this.elts.length; i++) {
+            k += baselib.hashes.getEqualHashCode(this.elts[i], depth);
+            k = baselib.hashes.hashMix(k);
+        }
+        return k;
+    };
+
     Vector.prototype.toList = function () {
         var ret = baselib.lists.EMPTY, i;
         for (i = this.length() - 1; i >= 0; i--) {
diff --git a/lang/kernel.rkt b/lang/kernel.rkt
index a79c723..2e751cd 100644
--- a/lang/kernel.rkt
+++ b/lang/kernel.rkt
@@ -153,7 +153,8 @@
          make-hash
          make-hasheqv
          make-hasheq
-         
+         hash-ref
+         hash-set!
 
 
          ;; Kernel inlinable
diff --git a/tests/more-tests/hash-code.rkt b/tests/more-tests/hash-code.rkt
new file mode 100644
index 0000000..e5b4739
--- /dev/null
+++ b/tests/more-tests/hash-code.rkt
@@ -0,0 +1,14 @@
+#lang planet dyoo/whalesong/base
+
+;; boxes
+;; bytes
+;; chars
+;; hashes
+;; keywords
+;; lists
+;; paths
+;; placeholders
+;; strings
+;; structs
+;; symbols
+;; vectors
\ No newline at end of file
diff --git a/tests/more-tests/hashes.rkt b/tests/more-tests/hashes.rkt
index d2e4089..5a815ff 100644
--- a/tests/more-tests/hashes.rkt
+++ b/tests/more-tests/hashes.rkt
@@ -33,4 +33,32 @@
 (make-hasheq '((1 . one)
                (2 . two)
                (3 . three)
-               (4 . four)))
\ No newline at end of file
+               (4 . four)))
+
+(hash-ref (make-hash '((1 . one)
+                       (2 . two)
+                       (3 . three)))
+          1)
+
+(hash-ref (make-hash '((1 . one)
+                       (2 . two)
+                       (3 . three)))
+          4
+          (lambda () 'not-found))
+
+
+
+(define words '("this" "is" "a" "test" "that" "is" "only" "a" "test!"))
+(define ht (make-hash))
+(for-each (lambda (w)
+            (hash-set! ht
+                       w
+                       (add1 (hash-ref ht w (lambda () 0)))))
+          words)
+(hash-ref ht "this")
+(hash-ref ht "is")
+(hash-ref ht "a")
+(hash-ref ht "test")
+(hash-ref ht "that")
+(hash-ref ht "only")
+(hash-ref ht "test!")
\ No newline at end of file