diff --git a/vlib/builtin/array.v b/vlib/builtin/array.v
index 01c7f4d100..34e0a330a6 100644
--- a/vlib/builtin/array.v
+++ b/vlib/builtin/array.v
@@ -94,7 +94,7 @@ pub fn (a mut array) insert(i int, val voidptr) {
 	if i >= a.len {
 		panic('array.insert: index larger than length')
 	}
-	a._push(val)
+	a.push(val)
 	size := a.element_size
 	C.memmove(a.data + (i + 1) * size, a.data + i * size, (a.len - i) * size)
 	a.set(i, val)
@@ -118,13 +118,6 @@ fn (a array) get(i int) voidptr {
 	return a.data + i * a.element_size
 }
 
-fn (a array) _get(i int) voidptr {
-	if i < 0 || i >= a.len {
-		panic('array index out of range: $i/$a.len')
-	}
-	return a.data + i * a.element_size
-}
-
 pub fn (a array) first() voidptr {
 	if a.len == 0 {
 		panic('array.first: empty array')
@@ -198,40 +191,6 @@ fn (arr mut array) push(val voidptr) {
 	arr.len++
 }
 
-fn (arr mut array) _push(val voidptr) {
-	if arr.len >= arr.cap - 1 {
-		cap := (arr.len + 1) * 2
-		// println('_push: realloc, new cap=$cap')
-		if arr.cap == 0 {
-			arr.data = calloc(cap * arr.element_size)
-		}
-		else {
-			arr.data = C.realloc(arr.data, cap * arr.element_size)
-		}
-		arr.cap = cap
-	}
-	C.memcpy(arr.data + arr.element_size * arr.len, val, arr.element_size)
-	arr.len++
-}
-
-// `val` is array.data
-// TODO make private, right now it's used by strings.Builder
-pub fn (arr mut array) _push_many(val voidptr, size int) {
-	if arr.len >= arr.cap - size {
-		cap := (arr.len + size) * 2
-		// println('_push: realloc, new cap=$cap')
-		if arr.cap == 0 {
-			arr.data = calloc(cap * arr.element_size)
-		}
-		else {
-			arr.data = C.realloc(arr.data, cap * arr.element_size)
-		}
-		arr.cap = cap
-	}
-	C.memcpy(arr.data + arr.element_size * arr.len, val, arr.element_size * size)
-	arr.len += size
-}
-
 // `val` is array.data
 // TODO make private, right now it's used by strings.Builder
 pub fn (arr mut array) push_many(val voidptr, size int) {
diff --git a/vlib/builtin/map.v b/vlib/builtin/map.v
index 7f6cb6c16e..55e75bf969 100644
--- a/vlib/builtin/map.v
+++ b/vlib/builtin/map.v
@@ -36,7 +36,7 @@ fn new_map_init(cap, elm_size int, keys &string, vals voidptr) map {
 		root: 0
 	}
 	for i in 0 .. cap {
-		res._set(keys[i], vals + i * elm_size)
+		res.set(keys[i], vals + i * elm_size)
 	}
 	return res
 }
@@ -116,15 +116,6 @@ fn (n & mapnode) find2(key string, element_size int) bool{
 	}
 }
 
-fn (m mut map) _set(key string, val voidptr) {
-	if isnil(m.root) {
-		m.root = new_node(key, val, m.element_size)
-		m.size++
-		return
-	}
-	m.insert(mut m.root, key, val)
-}
-
 fn (m mut map) set(key string, val voidptr) {
 	if isnil(m.root) {
 		m.root = new_node(key, val, m.element_size)
@@ -223,10 +214,6 @@ fn (m map) exists(key string) bool {
 	return !isnil(m.root) && m.root.find2(key, m.element_size)
 }
 
-fn (m map) _exists(key string) bool {
-	return !isnil(m.root) && m.root.find2(key, m.element_size)
-}
-
 pub fn (m map) print() {
 	println('<<<<<<<<')
 	//for i := 0; i < m.entries.len; i++ {
diff --git a/vlib/strings/builder_c.v b/vlib/strings/builder_c.v
index 10d68d2c9c..b26ca5e4ec 100644
--- a/vlib/strings/builder_c.v
+++ b/vlib/strings/builder_c.v
@@ -18,13 +18,13 @@ pub fn new_builder(initial_size int) Builder {
 }
 
 pub fn (b mut Builder) write(s string) {
-	b.buf._push_many(s.str, s.len)
+	b.buf.push_many(s.str, s.len)
 	//b.buf << []byte(s)  // TODO
 	b.len += s.len
 }
 
 pub fn (b mut Builder) writeln(s string) {
-	b.buf._push_many(s.str, s.len)
+	b.buf.push_many(s.str, s.len)
 	//b.buf << []byte(s)  // TODO
 	b.buf << `\n`
 	b.len += s.len + 1