diff --git a/src/pkg/container/vector/Makefile b/src/pkg/container/vector/Makefile
index ffd8937a789..c456c6a6c13 100644
--- a/src/pkg/container/vector/Makefile
+++ b/src/pkg/container/vector/Makefile
@@ -44,6 +44,7 @@ generate: vector.go vector_test.go
 	| gofmt -r='TestDo -> TestIntDo'\
 	| gofmt -r='TestIter -> TestIntIter'\
 	| gofmt -r='TestVectorData -> TestIntVectorData'\
+	| gofmt -r='interface{} -> int'\
 	> intvector_test.go\
 	
 	< vector_test.go cat\
@@ -66,4 +67,5 @@ generate: vector.go vector_test.go
 	| gofmt -r='TestDo -> TestStrDo'\
 	| gofmt -r='TestIter -> TestStrIter'\
 	| gofmt -r='TestVectorData -> TestStrVectorData'\
+	| gofmt -r='interface{} -> string'\
 	> stringvector_test.go
diff --git a/src/pkg/container/vector/defs.go b/src/pkg/container/vector/defs.go
index 7502865c9cc..a2febb6deeb 100644
--- a/src/pkg/container/vector/defs.go
+++ b/src/pkg/container/vector/defs.go
@@ -49,30 +49,3 @@ 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] }
-
-
-// Do calls function f for each element of the vector, in order.
-// The behavior of Do is undefined if f changes *p.
-func (p *Vector) Do(f func(elem interface{})) {
-	for _, e := range *p {
-		f(e)
-	}
-}
-
-
-// Do calls function f for each element of the vector, in order.
-// The behavior of Do is undefined if f changes *p.
-func (p *IntVector) Do(f func(elem int)) {
-	for _, e := range *p {
-		f(e)
-	}
-}
-
-
-// Do calls function f for each element of the vector, in order.
-// The behavior of Do is undefined if f changes *p.
-func (p *StringVector) Do(f func(elem string)) {
-	for _, e := range *p {
-		f(e)
-	}
-}
diff --git a/src/pkg/container/vector/intvector.go b/src/pkg/container/vector/intvector.go
index 708108b1839..6aad358e3d3 100644
--- a/src/pkg/container/vector/intvector.go
+++ b/src/pkg/container/vector/intvector.go
@@ -214,3 +214,12 @@ func (p *IntVector) Iter() <-chan int {
 	go p.iterate(c)
 	return c
 }
+
+
+// Do calls function f for each element of the vector, in order.
+// The behavior of Do is undefined if f changes *p.
+func (p *IntVector) Do(f func(elem int)) {
+	for _, e := range *p {
+		f(e)
+	}
+}
diff --git a/src/pkg/container/vector/intvector_test.go b/src/pkg/container/vector/intvector_test.go
index b8900478b25..c80dd52cca0 100644
--- a/src/pkg/container/vector/intvector_test.go
+++ b/src/pkg/container/vector/intvector_test.go
@@ -279,8 +279,9 @@ func TestIntDo(t *testing.T) {
 		a.Set(i, int2IntValue(salt*i))
 	}
 	count := 0
-	a.Do(func(i int) {
-		if i != count*salt {
+	a.Do(func(e int) {
+		i := intf2IntValue(e)
+		if i != int2IntValue(count*salt) {
 			t.Error(tname(a), "value at", count, "should be", count*salt, "not", i)
 		}
 		count++
@@ -294,8 +295,9 @@ func TestIntDo(t *testing.T) {
 		(*b)[i] = int2IntValue(salt * i)
 	}
 	count = 0
-	b.Do(func(i int) {
-		if i != count*salt {
+	b.Do(func(e int) {
+		i := intf2IntValue(e)
+		if i != int2IntValue(count*salt) {
 			t.Error(tname(b), "b) value at", count, "should be", count*salt, "not", i)
 		}
 		count++
@@ -310,8 +312,9 @@ func TestIntDo(t *testing.T) {
 		c[i] = int2IntValue(salt * i)
 	}
 	count = 0
-	c.Do(func(i int) {
-		if i != count*salt {
+	c.Do(func(e int) {
+		i := intf2IntValue(e)
+		if i != int2IntValue(count*salt) {
 			t.Error(tname(c), "c) value at", count, "should be", count*salt, "not", i)
 		}
 		count++
diff --git a/src/pkg/container/vector/stringvector.go b/src/pkg/container/vector/stringvector.go
index 86563ca2034..ddc030f817d 100644
--- a/src/pkg/container/vector/stringvector.go
+++ b/src/pkg/container/vector/stringvector.go
@@ -214,3 +214,12 @@ func (p *StringVector) Iter() <-chan string {
 	go p.iterate(c)
 	return c
 }
+
+
+// Do calls function f for each element of the vector, in order.
+// The behavior of Do is undefined if f changes *p.
+func (p *StringVector) Do(f func(elem string)) {
+	for _, e := range *p {
+		f(e)
+	}
+}
diff --git a/src/pkg/container/vector/stringvector_test.go b/src/pkg/container/vector/stringvector_test.go
index 5bc8a626bff..859dac2fde5 100644
--- a/src/pkg/container/vector/stringvector_test.go
+++ b/src/pkg/container/vector/stringvector_test.go
@@ -279,9 +279,10 @@ func TestStrDo(t *testing.T) {
 		a.Set(i, int2StrValue(salt*i))
 	}
 	count := 0
-	a.Do(func(s string) {
-		if s != int2StrValue(count*salt) {
-			t.Error(tname(a), "value at", count, "should be", count*salt, "not", s)
+	a.Do(func(e string) {
+		i := intf2StrValue(e)
+		if i != int2StrValue(count*salt) {
+			t.Error(tname(a), "value at", count, "should be", count*salt, "not", i)
 		}
 		count++
 	})
@@ -294,9 +295,10 @@ func TestStrDo(t *testing.T) {
 		(*b)[i] = int2StrValue(salt * i)
 	}
 	count = 0
-	b.Do(func(s string) {
-		if s != int2StrValue(count*salt) {
-			t.Error(tname(b), "b) value at", count, "should be", count*salt, "not", s)
+	b.Do(func(e string) {
+		i := intf2StrValue(e)
+		if i != int2StrValue(count*salt) {
+			t.Error(tname(b), "b) value at", count, "should be", count*salt, "not", i)
 		}
 		count++
 	})
@@ -310,9 +312,10 @@ func TestStrDo(t *testing.T) {
 		c[i] = int2StrValue(salt * i)
 	}
 	count = 0
-	c.Do(func(s string) {
-		if s != int2StrValue(count*salt) {
-			t.Error(tname(c), "c) value at", count, "should be", count*salt, "not", s)
+	c.Do(func(e string) {
+		i := intf2StrValue(e)
+		if i != int2StrValue(count*salt) {
+			t.Error(tname(c), "c) value at", count, "should be", count*salt, "not", i)
 		}
 		count++
 	})
diff --git a/src/pkg/container/vector/vector.go b/src/pkg/container/vector/vector.go
index 07717209654..986321b14b7 100644
--- a/src/pkg/container/vector/vector.go
+++ b/src/pkg/container/vector/vector.go
@@ -214,3 +214,12 @@ func (p *Vector) Iter() <-chan interface{} {
 	go p.iterate(c)
 	return c
 }
+
+
+// Do calls function f for each element of the vector, in order.
+// The behavior of Do is undefined if f changes *p.
+func (p *Vector) Do(f func(elem interface{})) {
+	for _, e := range *p {
+		f(e)
+	}
+}