diff --git a/ast/ast.go b/ast/ast.go
index 51a9b4a..84ebd5e 100644
--- a/ast/ast.go
+++ b/ast/ast.go
@@ -42,7 +42,7 @@ type Visitor interface {
 // syntax level.
 type ObjectNode struct {
 	K    string
-	Elem []KeyedNode
+	Elem []AssignmentNode
 }
 
 // AssignmentNode represents a direct assignment with an equals
@@ -82,12 +82,7 @@ func (n ObjectNode) Get(k string, insensitive bool) []Node {
 			}
 		}
 
-		switch n := elem.(type) {
-		case AssignmentNode:
-			result = append(result, n.Value)
-		default:
-			panic("unknown type")
-		}
+		result = append(result, elem.Value)
 	}
 
 	return result
@@ -121,6 +116,19 @@ func (n ListNode) Accept(v Visitor) {
 	}
 }
 
+func (n ListNode) Flatten() ListNode {
+	var elem []Node
+	for _, e := range n.Elem {
+		if ln, ok := e.(ListNode); ok {
+			elem = append(elem, ln.Flatten().Elem...)
+		} else {
+			elem = append(elem, e)
+		}
+	}
+
+	return ListNode{Elem: elem}
+}
+
 func (n LiteralNode) Accept(v Visitor) {
 	v.Visit(n)
 }
diff --git a/ast/ast_test.go b/ast/ast_test.go
index 16d4881..d4ff289 100644
--- a/ast/ast_test.go
+++ b/ast/ast_test.go
@@ -49,7 +49,7 @@ func TestListNode_accept(t *testing.T) {
 func TestObjectNode_accept(t *testing.T) {
 	n := ObjectNode{
 		K: "foo",
-		Elem: []KeyedNode{
+		Elem: []AssignmentNode{
 			AssignmentNode{K: "foo", Value: LiteralNode{Value: "foo"}},
 			AssignmentNode{K: "bar", Value: LiteralNode{Value: "bar"}},
 		},
@@ -58,9 +58,9 @@ func TestObjectNode_accept(t *testing.T) {
 	expected := []Node{
 		n,
 		n.Elem[0],
-		n.Elem[0].(AssignmentNode).Value,
+		n.Elem[0].Value,
 		n.Elem[1],
-		n.Elem[1].(AssignmentNode).Value,
+		n.Elem[1].Value,
 	}
 
 	v := new(MockVisitor)
@@ -74,7 +74,7 @@ func TestObjectNode_accept(t *testing.T) {
 func TestObjectNodeGet(t *testing.T) {
 	n := ObjectNode{
 		K: "foo",
-		Elem: []KeyedNode{
+		Elem: []AssignmentNode{
 			AssignmentNode{K: "foo", Value: LiteralNode{Value: "foo"}},
 			AssignmentNode{K: "bar", Value: LiteralNode{Value: "bar"}},
 			AssignmentNode{K: "foo", Value: LiteralNode{Value: "baz"}},
diff --git a/decoder.go b/decoder.go
index 5676821..08634fc 100644
--- a/decoder.go
+++ b/decoder.go
@@ -202,8 +202,7 @@ func (d *decoder) decodeMap(name string, raw ast.Node, result reflect.Value) err
 	}
 
 	// Go through each element and decode it.
-	for _, elem := range obj.Elem {
-		n := elem.(ast.AssignmentNode)
+	for _, n := range obj.Elem {
 		objValue := n.Value
 
 		// If we have an object node, expand to a list of objects
diff --git a/hcl/parse.y b/hcl/parse.y
index 8300c4c..07470fe 100644
--- a/hcl/parse.y
+++ b/hcl/parse.y
@@ -15,8 +15,8 @@ import (
 %union {
 	item     ast.Node
 	list     []ast.Node
-	klist    []ast.KeyedNode
-	kitem    ast.KeyedNode
+	alist    []ast.AssignmentNode
+	aitem    ast.AssignmentNode
 	listitem ast.Node
 	num      int
 	obj      ast.ObjectNode
@@ -25,8 +25,8 @@ import (
 
 %type   <item> number
 %type   <list> list
-%type   <klist> objectlist
-%type   <kitem> objectitem block
+%type   <alist> objectlist
+%type   <aitem> objectitem block
 %type   <listitem> listitem
 %type   <num> int
 %type   <obj> object
@@ -50,7 +50,7 @@ top:
 objectlist:
 	objectitem
 	{
-		$$ = []ast.KeyedNode{$1}
+		$$ = []ast.AssignmentNode{$1}
 	}
 |	objectitem objectlist
 	{
@@ -118,7 +118,7 @@ block:
 	{
 		obj := ast.ObjectNode{
 			K:    $2.Key(),
-			Elem: []ast.KeyedNode{$2},
+			Elem: []ast.AssignmentNode{$2},
 		}
 
 		$$ = ast.AssignmentNode{
diff --git a/hcl/y.go b/hcl/y.go
index f7d28ec..c7a81fb 100644
--- a/hcl/y.go
+++ b/hcl/y.go
@@ -16,8 +16,8 @@ type hclSymType struct {
 	yys      int
 	item     ast.Node
 	list     []ast.Node
-	klist    []ast.KeyedNode
-	kitem    ast.KeyedNode
+	alist    []ast.AssignmentNode
+	aitem    ast.AssignmentNode
 	listitem ast.Node
 	num      int
 	obj      ast.ObjectNode
@@ -363,23 +363,23 @@ hcldefault:
 		{
 			hclResult = &ast.ObjectNode{
 				K:    "",
-				Elem: hclS[hclpt-0].klist,
+				Elem: hclS[hclpt-0].alist,
 			}
 		}
 	case 2:
 		//line parse.y:52
 		{
-			hclVAL.klist = []ast.KeyedNode{hclS[hclpt-0].kitem}
+			hclVAL.alist = []ast.AssignmentNode{hclS[hclpt-0].aitem}
 		}
 	case 3:
 		//line parse.y:56
 		{
-			hclVAL.klist = append(hclS[hclpt-0].klist, hclS[hclpt-1].kitem)
+			hclVAL.alist = append(hclS[hclpt-0].alist, hclS[hclpt-1].aitem)
 		}
 	case 4:
 		//line parse.y:62
 		{
-			hclVAL.obj = ast.ObjectNode{Elem: hclS[hclpt-1].klist}
+			hclVAL.obj = ast.ObjectNode{Elem: hclS[hclpt-1].alist}
 		}
 	case 5:
 		//line parse.y:66
@@ -389,7 +389,7 @@ hcldefault:
 	case 6:
 		//line parse.y:72
 		{
-			hclVAL.kitem = ast.AssignmentNode{
+			hclVAL.aitem = ast.AssignmentNode{
 				K:     hclS[hclpt-2].str,
 				Value: hclS[hclpt-0].item,
 			}
@@ -397,7 +397,7 @@ hcldefault:
 	case 7:
 		//line parse.y:79
 		{
-			hclVAL.kitem = ast.AssignmentNode{
+			hclVAL.aitem = ast.AssignmentNode{
 				K: hclS[hclpt-2].str,
 				Value: ast.LiteralNode{
 					Type:  ast.ValueTypeString,
@@ -408,7 +408,7 @@ hcldefault:
 	case 8:
 		//line parse.y:89
 		{
-			hclVAL.kitem = ast.AssignmentNode{
+			hclVAL.aitem = ast.AssignmentNode{
 				K:     hclS[hclpt-2].str,
 				Value: hclS[hclpt-0].obj,
 			}
@@ -416,7 +416,7 @@ hcldefault:
 	case 9:
 		//line parse.y:96
 		{
-			hclVAL.kitem = ast.AssignmentNode{
+			hclVAL.aitem = ast.AssignmentNode{
 				K:     hclS[hclpt-4].str,
 				Value: ast.ListNode{Elem: hclS[hclpt-1].list},
 			}
@@ -424,12 +424,12 @@ hcldefault:
 	case 10:
 		//line parse.y:103
 		{
-			hclVAL.kitem = hclS[hclpt-0].kitem
+			hclVAL.aitem = hclS[hclpt-0].aitem
 		}
 	case 11:
 		//line parse.y:109
 		{
-			hclVAL.kitem = ast.AssignmentNode{
+			hclVAL.aitem = ast.AssignmentNode{
 				K: hclS[hclpt-1].str,
 				Value: ast.ListNode{
 					Elem: []ast.Node{hclS[hclpt-0].obj},
@@ -440,11 +440,11 @@ hcldefault:
 		//line parse.y:118
 		{
 			obj := ast.ObjectNode{
-				K:    hclS[hclpt-0].kitem.Key(),
-				Elem: []ast.KeyedNode{hclS[hclpt-0].kitem},
+				K:    hclS[hclpt-0].aitem.Key(),
+				Elem: []ast.AssignmentNode{hclS[hclpt-0].aitem},
 			}
 
-			hclVAL.kitem = ast.AssignmentNode{
+			hclVAL.aitem = ast.AssignmentNode{
 				K: hclS[hclpt-1].str,
 				Value: ast.ListNode{
 					Elem: []ast.Node{obj},
diff --git a/json/parse.y b/json/parse.y
index bb06be1..a1c565f 100644
--- a/json/parse.y
+++ b/json/parse.y
@@ -16,7 +16,7 @@ import (
 	array    ast.ListNode
 	assign   ast.AssignmentNode
 	item     ast.Node
-	klist    []ast.KeyedNode
+	klist    []ast.AssignmentNode
 	list     []ast.Node
 	num      int
 	str      string
@@ -59,7 +59,7 @@ object:
 members:
 	pair
 	{
-		$$ = []ast.KeyedNode{$1}
+		$$ = []ast.AssignmentNode{$1}
 	}
 |	pair COMMA members
 	{
diff --git a/json/y.go b/json/y.go
index 1a2ed97..4d31508 100644
--- a/json/y.go
+++ b/json/y.go
@@ -17,7 +17,7 @@ type jsonSymType struct {
 	array  ast.ListNode
 	assign ast.AssignmentNode
 	item   ast.Node
-	klist  []ast.KeyedNode
+	klist  []ast.AssignmentNode
 	list   []ast.Node
 	num    int
 	str    string
@@ -385,7 +385,7 @@ jsondefault:
 	case 4:
 		//line parse.y:61
 		{
-			jsonVAL.klist = []ast.KeyedNode{jsonS[jsonpt-0].assign}
+			jsonVAL.klist = []ast.AssignmentNode{jsonS[jsonpt-0].assign}
 		}
 	case 5:
 		//line parse.y:65