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diff --git a/src/pkg/container/vector/defs.go b/src/pkg/container/vector/defs.go
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+++ b/src/pkg/container/vector/defs.go
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+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package vector implements containers for managing sequences of elements.
+// Vectors grow and shrink dynamically as necessary.
+package vector
+
+// Vector is a container for numbered sequences of elements of type interface{}.
+// A vector's length and capacity adjusts automatically as necessary.
+// The zero value for Vector is an empty vector ready to use.
+type Vector []interface{}
+
+// IntVector is a container for numbered sequences of elements of type int.
+// A vector's length and capacity adjusts automatically as necessary.
+// The zero value for IntVector is an empty vector ready to use.
+type IntVector []int
+
+// StringVector is a container for numbered sequences of elements of type string.
+// A vector's length and capacity adjusts automatically as necessary.
+// The zero value for StringVector is an empty vector ready to use.
+type StringVector []string
+
+// Initial underlying array size
+const initialSize = 8
+
+// Partial sort.Interface support
+
+// LessInterface provides partial support of the sort.Interface.
+type LessInterface interface {
+	Less(y interface{}) bool
+}
+
+// Less returns a boolean denoting whether the i'th element is less than the j'th element.
+func (p *Vector) Less(i, j int) bool { return (*p)[i].(LessInterface).Less((*p)[j]) }
+
+// sort.Interface support
+
+// Less returns a boolean denoting whether the i'th element is less than the j'th element.
+func (p *IntVector) Less(i, j int) bool { return (*p)[i] < (*p)[j] }
+
+// Less returns a boolean denoting whether the i'th element is less than the j'th element.
+func (p *StringVector) Less(i, j int) bool { return (*p)[i] < (*p)[j] }