From 0de1a391de875bd4701a17422306977ee4e97a50 Mon Sep 17 00:00:00 2001
From: James Nugent <james@jen20.com>
Date: Fri, 26 Feb 2016 14:56:07 -0500
Subject: [PATCH] dependencies: Update github.com/hashicorp/hil

---
 Godeps/Godeps.json                            |   4 +-
 vendor/github.com/hashicorp/hil/.gitignore    |   2 +
 vendor/github.com/hashicorp/hil/ast/ast.go    |   1 +
 vendor/github.com/hashicorp/hil/ast/index.go  |  68 +++++++++
 vendor/github.com/hashicorp/hil/ast/scope.go  |  25 ++++
 .../hashicorp/hil/ast/type_string.go          |   4 +
 .../github.com/hashicorp/hil/check_types.go   |  52 +++++++
 vendor/github.com/hashicorp/hil/eval.go       |  49 ++++++
 vendor/github.com/hashicorp/hil/lang.y        |  12 ++
 vendor/github.com/hashicorp/hil/lex.go        |   4 +
 vendor/github.com/hashicorp/hil/y.go          | 114 ++++++++------
 vendor/github.com/hashicorp/hil/y.output      | 139 +++++++++++-------
 12 files changed, 374 insertions(+), 100 deletions(-)
 create mode 100644 vendor/github.com/hashicorp/hil/ast/index.go

diff --git a/Godeps/Godeps.json b/Godeps/Godeps.json
index ab45f39b8..6b5158124 100644
--- a/Godeps/Godeps.json
+++ b/Godeps/Godeps.json
@@ -666,11 +666,11 @@
 		},
 		{
 			"ImportPath": "github.com/hashicorp/hil",
-			"Rev": "42518c6f01625b5e6948a6a0e6a0792df126c548"
+			"Rev": "0457360d54ca4d081a769eaa1617e0462153fd70"
 		},
 		{
 			"ImportPath": "github.com/hashicorp/hil/ast",
-			"Rev": "42518c6f01625b5e6948a6a0e6a0792df126c548"
+			"Rev": "0457360d54ca4d081a769eaa1617e0462153fd70"
 		},
 		{
 			"ImportPath": "github.com/hashicorp/logutils",
diff --git a/vendor/github.com/hashicorp/hil/.gitignore b/vendor/github.com/hashicorp/hil/.gitignore
index e43b0f988..9d6e5df38 100644
--- a/vendor/github.com/hashicorp/hil/.gitignore
+++ b/vendor/github.com/hashicorp/hil/.gitignore
@@ -1 +1,3 @@
 .DS_Store
+.idea
+*.iml
diff --git a/vendor/github.com/hashicorp/hil/ast/ast.go b/vendor/github.com/hashicorp/hil/ast/ast.go
index 1d784c78a..f1a88d58c 100644
--- a/vendor/github.com/hashicorp/hil/ast/ast.go
+++ b/vendor/github.com/hashicorp/hil/ast/ast.go
@@ -52,4 +52,5 @@ const (
 	TypeString
 	TypeInt
 	TypeFloat
+	TypeList
 )
diff --git a/vendor/github.com/hashicorp/hil/ast/index.go b/vendor/github.com/hashicorp/hil/ast/index.go
new file mode 100644
index 000000000..4d3313510
--- /dev/null
+++ b/vendor/github.com/hashicorp/hil/ast/index.go
@@ -0,0 +1,68 @@
+package ast
+
+import (
+	"fmt"
+	"strings"
+)
+
+// Index represents an indexing operation into another data structure
+type Index struct {
+	Target Node
+	Key    Node
+	Posx   Pos
+}
+
+func (n *Index) Accept(v Visitor) Node {
+	return v(n)
+}
+
+func (n *Index) Pos() Pos {
+	return n.Posx
+}
+
+func (n *Index) String() string {
+	return fmt.Sprintf("Index(%s, %s)", n.Target, n.Key)
+}
+
+func (n *Index) Type(s Scope) (Type, error) {
+	variableAccess, ok := n.Target.(*VariableAccess)
+	if !ok {
+		return TypeInvalid, fmt.Errorf("target is not a variable")
+	}
+
+	variable, ok := s.LookupVar(variableAccess.Name)
+	if !ok {
+		return TypeInvalid, fmt.Errorf("unknown variable accessed: %s", variableAccess.Name)
+	}
+	if variable.Type != TypeList {
+		return TypeInvalid, fmt.Errorf("invalid index operation into non-indexable type: %s", variable.Type)
+	}
+
+	list := variable.Value.([]Variable)
+
+	// Ensure that the types of the list elements are homogenous
+	listTypes := make(map[Type]struct{})
+	for _, v := range list {
+		if _, ok := listTypes[v.Type]; ok {
+			continue
+		}
+		listTypes[v.Type] = struct{}{}
+	}
+
+	if len(listTypes) != 1 {
+		typesFound := make([]string, len(listTypes))
+		i := 0
+		for k, _ := range listTypes {
+			typesFound[0] = k.String()
+			i++
+		}
+		types := strings.Join(typesFound, ", ")
+		return TypeInvalid, fmt.Errorf("list %q does not have homogenous types. found %s", variableAccess.Name, types)
+	}
+
+	return list[0].Type, nil
+}
+
+func (n *Index) GoString() string {
+	return fmt.Sprintf("*%#v", *n)
+}
diff --git a/vendor/github.com/hashicorp/hil/ast/scope.go b/vendor/github.com/hashicorp/hil/ast/scope.go
index 77c3ee79a..7a975d999 100644
--- a/vendor/github.com/hashicorp/hil/ast/scope.go
+++ b/vendor/github.com/hashicorp/hil/ast/scope.go
@@ -1,5 +1,10 @@
 package ast
 
+import (
+	"fmt"
+	"reflect"
+)
+
 // Scope is the interface used to look up variables and functions while
 // evaluating. How these functions/variables are defined are up to the caller.
 type Scope interface {
@@ -14,6 +19,26 @@ type Variable struct {
 	Type  Type
 }
 
+// NewVariable creates a new Variable for the given value. This will
+// attempt to infer the correct type. If it can't, an error will be returned.
+func NewVariable(v interface{}) (result Variable, err error) {
+	switch v := reflect.ValueOf(v); v.Kind() {
+	case reflect.String:
+		result.Type = TypeString
+	default:
+		err = fmt.Errorf("Unknown type: %s", v.Kind())
+	}
+
+	result.Value = v
+	return
+}
+
+// String implements Stringer on Variable, displaying the type and value
+// of the Variable.
+func (v Variable) String() string {
+	return fmt.Sprintf("{Variable (%s): %+v}", v.Type, v.Value)
+}
+
 // Function defines a function that can be executed by the engine.
 // The type checker will validate that the proper types will be called
 // to the callback.
diff --git a/vendor/github.com/hashicorp/hil/ast/type_string.go b/vendor/github.com/hashicorp/hil/ast/type_string.go
index 5410e011e..32bfde840 100644
--- a/vendor/github.com/hashicorp/hil/ast/type_string.go
+++ b/vendor/github.com/hashicorp/hil/ast/type_string.go
@@ -10,6 +10,7 @@ const (
 	_Type_name_2 = "TypeString"
 	_Type_name_3 = "TypeInt"
 	_Type_name_4 = "TypeFloat"
+	_Type_name_5 = "TypeList"
 )
 
 var (
@@ -18,6 +19,7 @@ var (
 	_Type_index_2 = [...]uint8{0, 10}
 	_Type_index_3 = [...]uint8{0, 7}
 	_Type_index_4 = [...]uint8{0, 9}
+	_Type_index_5 = [...]uint8{0, 8}
 )
 
 func (i Type) String() string {
@@ -32,6 +34,8 @@ func (i Type) String() string {
 		return _Type_name_3
 	case i == 16:
 		return _Type_name_4
+	case i == 32:
+		return _Type_name_5
 	default:
 		return fmt.Sprintf("Type(%d)", i)
 	}
diff --git a/vendor/github.com/hashicorp/hil/check_types.go b/vendor/github.com/hashicorp/hil/check_types.go
index 563591cf1..afffffcf1 100644
--- a/vendor/github.com/hashicorp/hil/check_types.go
+++ b/vendor/github.com/hashicorp/hil/check_types.go
@@ -61,6 +61,9 @@ func (v *TypeCheck) visit(raw ast.Node) ast.Node {
 	case *ast.Call:
 		tc := &typeCheckCall{n}
 		result, err = tc.TypeCheck(v)
+	case *ast.Index:
+		tc := &typeCheckIndex{n}
+		result, err = tc.TypeCheck(v)
 	case *ast.Concat:
 		tc := &typeCheckConcat{n}
 		result, err = tc.TypeCheck(v)
@@ -285,6 +288,55 @@ func (tc *typeCheckVariableAccess) TypeCheck(v *TypeCheck) (ast.Node, error) {
 	return tc.n, nil
 }
 
+type typeCheckIndex struct {
+	n *ast.Index
+}
+
+func (tc *typeCheckIndex) TypeCheck(v *TypeCheck) (ast.Node, error) {
+
+	value, err := tc.n.Key.Type(v.Scope)
+	if err != nil {
+		return nil, err
+	}
+	if value != ast.TypeInt {
+		return nil, fmt.Errorf("key of an index must be an int, was %s", value)
+	}
+
+	// Ensure we have a VariableAccess as the target
+	varAccessNode, ok := tc.n.Target.(*ast.VariableAccess)
+	if !ok {
+		return nil, fmt.Errorf("target of an index must be a VariableAccess node, was %T", tc.n.Target)
+	}
+
+	// Get the variable
+	variable, ok := v.Scope.LookupVar(varAccessNode.Name)
+	if !ok {
+		return nil, fmt.Errorf("unknown variable accessed: %s", varAccessNode.Name)
+	}
+	if variable.Type != ast.TypeList {
+		return nil, fmt.Errorf("invalid index operation into non-indexable type: %s", variable.Type)
+	}
+
+	list := variable.Value.([]ast.Variable)
+
+	// Ensure that the types of the list elements are homogenous
+	listTypes := make(map[ast.Type]struct{})
+	for _, v := range list {
+		if _, ok := listTypes[v.Type]; ok {
+			continue
+		}
+		listTypes[v.Type] = struct{}{}
+	}
+
+	if len(listTypes) != 1 {
+		return nil, fmt.Errorf("list %q does not have homogenous types (%s)", varAccessNode.Name)
+	}
+
+	// This is the type since the list is homogenous in type
+	v.StackPush(list[0].Type)
+	return tc.n, nil
+}
+
 func (v *TypeCheck) ImplicitConversion(
 	actual ast.Type, expected ast.Type, n ast.Node) ast.Node {
 	if v.Implicit == nil {
diff --git a/vendor/github.com/hashicorp/hil/eval.go b/vendor/github.com/hashicorp/hil/eval.go
index edc2d0128..6b81c760b 100644
--- a/vendor/github.com/hashicorp/hil/eval.go
+++ b/vendor/github.com/hashicorp/hil/eval.go
@@ -140,6 +140,8 @@ func (v *evalVisitor) visit(raw ast.Node) ast.Node {
 // types as well as any other EvalNode implementations.
 func evalNode(raw ast.Node) (EvalNode, error) {
 	switch n := raw.(type) {
+	case *ast.Index:
+		return &evalIndex{n}, nil
 	case *ast.Call:
 		return &evalCall{n}, nil
 	case *ast.Concat:
@@ -184,6 +186,53 @@ func (v *evalCall) Eval(s ast.Scope, stack *ast.Stack) (interface{}, ast.Type, e
 	return result, function.ReturnType, nil
 }
 
+type evalIndex struct{ *ast.Index }
+
+func (v *evalIndex) Eval(scope ast.Scope, stack *ast.Stack) (interface{}, ast.Type, error) {
+	evalVarAccess, err := evalNode(v.Target)
+	if err != nil {
+		return nil, ast.TypeInvalid, err
+	}
+	target, targetType, err := evalVarAccess.Eval(scope, stack)
+
+	evalKey, err := evalNode(v.Key)
+	if err != nil {
+		return nil, ast.TypeInvalid, err
+	}
+	key, keyType, err := evalKey.Eval(scope, stack)
+
+	// Last sanity check
+	if targetType != ast.TypeList {
+		return nil, ast.TypeInvalid, fmt.Errorf("target for indexing must be ast.TypeList, is %s", targetType)
+	}
+	if keyType != ast.TypeInt {
+		return nil, ast.TypeInvalid, fmt.Errorf("key for indexing must be ast.TypeInt, is %s", keyType)
+	}
+
+	list, ok := target.([]ast.Variable)
+	if !ok {
+		return nil, ast.TypeInvalid, fmt.Errorf("cannot cast target to []Variable")
+	}
+
+	keyInt, ok := key.(int)
+	if !ok {
+		return nil, ast.TypeInvalid, fmt.Errorf("cannot cast key to int")
+	}
+
+	if len(list) == 0 {
+		return nil, ast.TypeInvalid, fmt.Errorf("list is empty")
+	}
+
+	if keyInt < 0 || len(list) < keyInt+1 {
+		return nil, ast.TypeInvalid, fmt.Errorf("index %d out of range (max %d)", keyInt, len(list))
+	}
+
+	returnVal := list[keyInt].Value
+	returnType := list[keyInt].Type
+
+	return returnVal, returnType, nil
+}
+
 type evalConcat struct{ *ast.Concat }
 
 func (v *evalConcat) Eval(s ast.Scope, stack *ast.Stack) (interface{}, ast.Type, error) {
diff --git a/vendor/github.com/hashicorp/hil/lang.y b/vendor/github.com/hashicorp/hil/lang.y
index 296ebeb92..6dc15f0d8 100644
--- a/vendor/github.com/hashicorp/hil/lang.y
+++ b/vendor/github.com/hashicorp/hil/lang.y
@@ -21,6 +21,7 @@ import (
 %token  <str> PROGRAM_BRACKET_LEFT PROGRAM_BRACKET_RIGHT
 %token  <str> PROGRAM_STRING_START PROGRAM_STRING_END
 %token  <str> PAREN_LEFT PAREN_RIGHT COMMA
+%token  <str> SQUARE_BRACKET_LEFT SQUARE_BRACKET_RIGHT
 
 %token <token> ARITH_OP IDENTIFIER INTEGER FLOAT STRING
 
@@ -157,6 +158,17 @@ expr:
     {
         $$ = &ast.Call{Func: $1.Value.(string), Args: $3, Posx: $1.Pos}
     }
+|   IDENTIFIER SQUARE_BRACKET_LEFT expr SQUARE_BRACKET_RIGHT
+    {
+        $$ = &ast.Index{
+                Target: &ast.VariableAccess{
+                    Name: $1.Value.(string),
+                    Posx: $1.Pos,
+                },
+                Key: $3,
+                Posx: $1.Pos,
+            }
+    }
 
 args:
 	{
diff --git a/vendor/github.com/hashicorp/hil/lex.go b/vendor/github.com/hashicorp/hil/lex.go
index 8db6e13c8..a66694641 100644
--- a/vendor/github.com/hashicorp/hil/lex.go
+++ b/vendor/github.com/hashicorp/hil/lex.go
@@ -166,6 +166,10 @@ func (x *parserLex) lexModeInterpolation(yylval *parserSymType) int {
 			return PAREN_LEFT
 		case ')':
 			return PAREN_RIGHT
+		case '[':
+			return SQUARE_BRACKET_LEFT
+		case ']':
+			return SQUARE_BRACKET_RIGHT
 		case ',':
 			return COMMA
 		case '+':
diff --git a/vendor/github.com/hashicorp/hil/y.go b/vendor/github.com/hashicorp/hil/y.go
index fee7aaafb..bf4ca1bc3 100644
--- a/vendor/github.com/hashicorp/hil/y.go
+++ b/vendor/github.com/hashicorp/hil/y.go
@@ -24,11 +24,13 @@ const PROGRAM_STRING_END = 57349
 const PAREN_LEFT = 57350
 const PAREN_RIGHT = 57351
 const COMMA = 57352
-const ARITH_OP = 57353
-const IDENTIFIER = 57354
-const INTEGER = 57355
-const FLOAT = 57356
-const STRING = 57357
+const SQUARE_BRACKET_LEFT = 57353
+const SQUARE_BRACKET_RIGHT = 57354
+const ARITH_OP = 57355
+const IDENTIFIER = 57356
+const INTEGER = 57357
+const FLOAT = 57358
+const STRING = 57359
 
 var parserToknames = [...]string{
 	"$end",
@@ -41,6 +43,8 @@ var parserToknames = [...]string{
 	"PAREN_LEFT",
 	"PAREN_RIGHT",
 	"COMMA",
+	"SQUARE_BRACKET_LEFT",
+	"SQUARE_BRACKET_RIGHT",
 	"ARITH_OP",
 	"IDENTIFIER",
 	"INTEGER",
@@ -53,7 +57,7 @@ const parserEofCode = 1
 const parserErrCode = 2
 const parserMaxDepth = 200
 
-//line lang.y:184
+//line lang.y:196
 
 //line yacctab:1
 var parserExca = [...]int{
@@ -62,52 +66,57 @@ var parserExca = [...]int{
 	-2, 0,
 }
 
-const parserNprod = 20
+const parserNprod = 21
 const parserPrivate = 57344
 
 var parserTokenNames []string
 var parserStates []string
 
-const parserLast = 34
+const parserLast = 37
 
 var parserAct = [...]int{
 
-	9, 7, 3, 16, 22, 8, 17, 17, 20, 17,
-	1, 18, 6, 23, 8, 19, 25, 26, 21, 11,
-	2, 24, 7, 4, 5, 0, 10, 27, 0, 14,
-	15, 12, 13, 6,
+	9, 7, 29, 17, 23, 16, 17, 3, 17, 20,
+	8, 18, 21, 17, 6, 19, 27, 28, 22, 8,
+	1, 25, 26, 7, 11, 2, 24, 10, 4, 30,
+	5, 0, 14, 15, 12, 13, 6,
 }
 var parserPact = [...]int{
 
-	-3, -1000, -3, -1000, -1000, -1000, -1000, 18, -1000, -2,
-	18, -3, -1000, -1000, 18, 0, -1000, 18, -5, -1000,
-	18, -1000, -1000, 7, -4, -1000, 18, -4,
+	-3, -1000, -3, -1000, -1000, -1000, -1000, 19, -1000, 0,
+	19, -3, -1000, -1000, 19, 1, -1000, 19, -5, -1000,
+	19, 19, -1000, -1000, 7, -7, -10, -1000, 19, -1000,
+	-7,
 }
 var parserPgo = [...]int{
 
-	0, 0, 24, 23, 19, 2, 13, 10,
+	0, 0, 30, 28, 24, 7, 26, 20,
 }
 var parserR1 = [...]int{
 
 	0, 7, 7, 4, 4, 5, 5, 2, 1, 1,
-	1, 1, 1, 1, 1, 1, 6, 6, 6, 3,
+	1, 1, 1, 1, 1, 1, 1, 6, 6, 6,
+	3,
 }
 var parserR2 = [...]int{
 
 	0, 0, 1, 1, 2, 1, 1, 3, 3, 1,
-	1, 1, 2, 3, 1, 4, 0, 3, 1, 1,
+	1, 1, 2, 3, 1, 4, 4, 0, 3, 1,
+	1,
 }
 var parserChk = [...]int{
 
-	-1000, -7, -4, -5, -3, -2, 15, 4, -5, -1,
-	8, -4, 13, 14, 11, 12, 5, 11, -1, -1,
-	8, -1, 9, -6, -1, 9, 10, -1,
+	-1000, -7, -4, -5, -3, -2, 17, 4, -5, -1,
+	8, -4, 15, 16, 13, 14, 5, 13, -1, -1,
+	8, 11, -1, 9, -6, -1, -1, 9, 10, 12,
+	-1,
 }
 var parserDef = [...]int{
 
-	1, -2, 2, 3, 5, 6, 19, 0, 4, 0,
+	1, -2, 2, 3, 5, 6, 20, 0, 4, 0,
 	0, 9, 10, 11, 0, 14, 7, 0, 0, 12,
-	16, 13, 8, 0, 18, 15, 0, 17,
+	17, 0, 13, 8, 0, 19, 0, 15, 0, 16,
+	18,
 }
 var parserTok1 = [...]int{
 
@@ -116,7 +125,7 @@ var parserTok1 = [...]int{
 var parserTok2 = [...]int{
 
 	2, 3, 4, 5, 6, 7, 8, 9, 10, 11,
-	12, 13, 14, 15,
+	12, 13, 14, 15, 16, 17,
 }
 var parserTok3 = [...]int{
 	0,
@@ -464,7 +473,7 @@ parserdefault:
 
 	case 1:
 		parserDollar = parserS[parserpt-0 : parserpt+1]
-		//line lang.y:35
+		//line lang.y:36
 		{
 			parserResult = &ast.LiteralNode{
 				Value: "",
@@ -474,7 +483,7 @@ parserdefault:
 		}
 	case 2:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:43
+		//line lang.y:44
 		{
 			parserResult = parserDollar[1].node
 
@@ -497,13 +506,13 @@ parserdefault:
 		}
 	case 3:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:66
+		//line lang.y:67
 		{
 			parserVAL.node = parserDollar[1].node
 		}
 	case 4:
 		parserDollar = parserS[parserpt-2 : parserpt+1]
-		//line lang.y:70
+		//line lang.y:71
 		{
 			var result []ast.Node
 			if c, ok := parserDollar[1].node.(*ast.Concat); ok {
@@ -519,37 +528,37 @@ parserdefault:
 		}
 	case 5:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:86
+		//line lang.y:87
 		{
 			parserVAL.node = parserDollar[1].node
 		}
 	case 6:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:90
+		//line lang.y:91
 		{
 			parserVAL.node = parserDollar[1].node
 		}
 	case 7:
 		parserDollar = parserS[parserpt-3 : parserpt+1]
-		//line lang.y:96
+		//line lang.y:97
 		{
 			parserVAL.node = parserDollar[2].node
 		}
 	case 8:
 		parserDollar = parserS[parserpt-3 : parserpt+1]
-		//line lang.y:102
+		//line lang.y:103
 		{
 			parserVAL.node = parserDollar[2].node
 		}
 	case 9:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:106
+		//line lang.y:107
 		{
 			parserVAL.node = parserDollar[1].node
 		}
 	case 10:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:110
+		//line lang.y:111
 		{
 			parserVAL.node = &ast.LiteralNode{
 				Value: parserDollar[1].token.Value.(int),
@@ -559,7 +568,7 @@ parserdefault:
 		}
 	case 11:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:118
+		//line lang.y:119
 		{
 			parserVAL.node = &ast.LiteralNode{
 				Value: parserDollar[1].token.Value.(float64),
@@ -569,7 +578,7 @@ parserdefault:
 		}
 	case 12:
 		parserDollar = parserS[parserpt-2 : parserpt+1]
-		//line lang.y:126
+		//line lang.y:127
 		{
 			// This is REALLY jank. We assume that a singular ARITH_OP
 			// means 0 ARITH_OP expr, which... is weird. We don't want to
@@ -590,7 +599,7 @@ parserdefault:
 		}
 	case 13:
 		parserDollar = parserS[parserpt-3 : parserpt+1]
-		//line lang.y:145
+		//line lang.y:146
 		{
 			parserVAL.node = &ast.Arithmetic{
 				Op:    parserDollar[2].token.Value.(ast.ArithmeticOp),
@@ -600,37 +609,50 @@ parserdefault:
 		}
 	case 14:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:153
+		//line lang.y:154
 		{
 			parserVAL.node = &ast.VariableAccess{Name: parserDollar[1].token.Value.(string), Posx: parserDollar[1].token.Pos}
 		}
 	case 15:
 		parserDollar = parserS[parserpt-4 : parserpt+1]
-		//line lang.y:157
+		//line lang.y:158
 		{
 			parserVAL.node = &ast.Call{Func: parserDollar[1].token.Value.(string), Args: parserDollar[3].nodeList, Posx: parserDollar[1].token.Pos}
 		}
 	case 16:
-		parserDollar = parserS[parserpt-0 : parserpt+1]
+		parserDollar = parserS[parserpt-4 : parserpt+1]
 		//line lang.y:162
+		{
+			parserVAL.node = &ast.Index{
+				Target: &ast.VariableAccess{
+					Name: parserDollar[1].token.Value.(string),
+					Posx: parserDollar[1].token.Pos,
+				},
+				Key:  parserDollar[3].node,
+				Posx: parserDollar[1].token.Pos,
+			}
+		}
+	case 17:
+		parserDollar = parserS[parserpt-0 : parserpt+1]
+		//line lang.y:174
 		{
 			parserVAL.nodeList = nil
 		}
-	case 17:
+	case 18:
 		parserDollar = parserS[parserpt-3 : parserpt+1]
-		//line lang.y:166
+		//line lang.y:178
 		{
 			parserVAL.nodeList = append(parserDollar[1].nodeList, parserDollar[3].node)
 		}
-	case 18:
+	case 19:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:170
+		//line lang.y:182
 		{
 			parserVAL.nodeList = append(parserVAL.nodeList, parserDollar[1].node)
 		}
-	case 19:
+	case 20:
 		parserDollar = parserS[parserpt-1 : parserpt+1]
-		//line lang.y:176
+		//line lang.y:188
 		{
 			parserVAL.node = &ast.LiteralNode{
 				Value: parserDollar[1].token.Value.(string),
diff --git a/vendor/github.com/hashicorp/hil/y.output b/vendor/github.com/hashicorp/hil/y.output
index 92c1ff4bc..26df788c5 100644
--- a/vendor/github.com/hashicorp/hil/y.output
+++ b/vendor/github.com/hashicorp/hil/y.output
@@ -5,7 +5,7 @@ state 0
 
 	PROGRAM_BRACKET_LEFT  shift 7
 	STRING  shift 6
-	.  reduce 1 (src line 34)
+	.  reduce 1 (src line 35)
 
 	interpolation  goto 5
 	literal  goto 4
@@ -26,7 +26,7 @@ state 2
 
 	PROGRAM_BRACKET_LEFT  shift 7
 	STRING  shift 6
-	.  reduce 2 (src line 42)
+	.  reduce 2 (src line 43)
 
 	interpolation  goto 5
 	literal  goto 4
@@ -35,25 +35,25 @@ state 2
 state 3
 	literalModeTop:  literalModeValue.    (3)
 
-	.  reduce 3 (src line 64)
+	.  reduce 3 (src line 65)
 
 
 state 4
 	literalModeValue:  literal.    (5)
 
-	.  reduce 5 (src line 84)
+	.  reduce 5 (src line 85)
 
 
 state 5
 	literalModeValue:  interpolation.    (6)
 
-	.  reduce 6 (src line 89)
+	.  reduce 6 (src line 90)
 
 
 state 6
-	literal:  STRING.    (19)
+	literal:  STRING.    (20)
 
-	.  reduce 19 (src line 174)
+	.  reduce 20 (src line 186)
 
 
 state 7
@@ -77,7 +77,7 @@ state 7
 state 8
 	literalModeTop:  literalModeTop literalModeValue.    (4)
 
-	.  reduce 4 (src line 69)
+	.  reduce 4 (src line 70)
 
 
 state 9
@@ -113,7 +113,7 @@ state 11
 
 	PROGRAM_BRACKET_LEFT  shift 7
 	STRING  shift 6
-	.  reduce 9 (src line 105)
+	.  reduce 9 (src line 106)
 
 	interpolation  goto 5
 	literal  goto 4
@@ -122,13 +122,13 @@ state 11
 state 12
 	expr:  INTEGER.    (10)
 
-	.  reduce 10 (src line 109)
+	.  reduce 10 (src line 110)
 
 
 state 13
 	expr:  FLOAT.    (11)
 
-	.  reduce 11 (src line 117)
+	.  reduce 11 (src line 118)
 
 
 state 14
@@ -152,15 +152,17 @@ state 14
 state 15
 	expr:  IDENTIFIER.    (14)
 	expr:  IDENTIFIER.PAREN_LEFT args PAREN_RIGHT 
+	expr:  IDENTIFIER.SQUARE_BRACKET_LEFT expr SQUARE_BRACKET_RIGHT 
 
 	PAREN_LEFT  shift 20
-	.  reduce 14 (src line 152)
+	SQUARE_BRACKET_LEFT  shift 21
+	.  reduce 14 (src line 153)
 
 
 state 16
 	interpolation:  PROGRAM_BRACKET_LEFT expr PROGRAM_BRACKET_RIGHT.    (7)
 
-	.  reduce 7 (src line 94)
+	.  reduce 7 (src line 95)
 
 
 state 17
@@ -175,7 +177,7 @@ state 17
 	STRING  shift 6
 	.  error
 
-	expr  goto 21
+	expr  goto 22
 	interpolation  goto 5
 	literal  goto 4
 	literalModeTop  goto 11
@@ -185,7 +187,7 @@ state 18
 	expr:  PAREN_LEFT expr.PAREN_RIGHT 
 	expr:  expr.ARITH_OP expr 
 
-	PAREN_RIGHT  shift 22
+	PAREN_RIGHT  shift 23
 	ARITH_OP  shift 17
 	.  error
 
@@ -194,12 +196,12 @@ state 19
 	expr:  ARITH_OP expr.    (12)
 	expr:  expr.ARITH_OP expr 
 
-	.  reduce 12 (src line 125)
+	.  reduce 12 (src line 126)
 
 
 state 20
 	expr:  IDENTIFIER PAREN_LEFT.args PAREN_RIGHT 
-	args: .    (16)
+	args: .    (17)
 
 	PROGRAM_BRACKET_LEFT  shift 7
 	PAREN_LEFT  shift 10
@@ -208,52 +210,79 @@ state 20
 	INTEGER  shift 12
 	FLOAT  shift 13
 	STRING  shift 6
-	.  reduce 16 (src line 161)
+	.  reduce 17 (src line 173)
 
-	expr  goto 24
+	expr  goto 25
 	interpolation  goto 5
 	literal  goto 4
 	literalModeTop  goto 11
 	literalModeValue  goto 3
-	args  goto 23
+	args  goto 24
 
 state 21
+	expr:  IDENTIFIER SQUARE_BRACKET_LEFT.expr SQUARE_BRACKET_RIGHT 
+
+	PROGRAM_BRACKET_LEFT  shift 7
+	PAREN_LEFT  shift 10
+	ARITH_OP  shift 14
+	IDENTIFIER  shift 15
+	INTEGER  shift 12
+	FLOAT  shift 13
+	STRING  shift 6
+	.  error
+
+	expr  goto 26
+	interpolation  goto 5
+	literal  goto 4
+	literalModeTop  goto 11
+	literalModeValue  goto 3
+
+state 22
 	expr:  expr.ARITH_OP expr 
 	expr:  expr ARITH_OP expr.    (13)
 
-	.  reduce 13 (src line 144)
-
-
-state 22
-	expr:  PAREN_LEFT expr PAREN_RIGHT.    (8)
-
-	.  reduce 8 (src line 100)
+	.  reduce 13 (src line 145)
 
 
 state 23
-	expr:  IDENTIFIER PAREN_LEFT args.PAREN_RIGHT 
-	args:  args.COMMA expr 
+	expr:  PAREN_LEFT expr PAREN_RIGHT.    (8)
 
-	PAREN_RIGHT  shift 25
-	COMMA  shift 26
-	.  error
+	.  reduce 8 (src line 101)
 
 
 state 24
-	expr:  expr.ARITH_OP expr 
-	args:  expr.    (18)
+	expr:  IDENTIFIER PAREN_LEFT args.PAREN_RIGHT 
+	args:  args.COMMA expr 
 
-	ARITH_OP  shift 17
-	.  reduce 18 (src line 169)
+	PAREN_RIGHT  shift 27
+	COMMA  shift 28
+	.  error
 
 
 state 25
-	expr:  IDENTIFIER PAREN_LEFT args PAREN_RIGHT.    (15)
+	expr:  expr.ARITH_OP expr 
+	args:  expr.    (19)
 
-	.  reduce 15 (src line 156)
+	ARITH_OP  shift 17
+	.  reduce 19 (src line 181)
 
 
 state 26
+	expr:  expr.ARITH_OP expr 
+	expr:  IDENTIFIER SQUARE_BRACKET_LEFT expr.SQUARE_BRACKET_RIGHT 
+
+	SQUARE_BRACKET_RIGHT  shift 29
+	ARITH_OP  shift 17
+	.  error
+
+
+state 27
+	expr:  IDENTIFIER PAREN_LEFT args PAREN_RIGHT.    (15)
+
+	.  reduce 15 (src line 157)
+
+
+state 28
 	args:  args COMMA.expr 
 
 	PROGRAM_BRACKET_LEFT  shift 7
@@ -265,29 +294,35 @@ state 26
 	STRING  shift 6
 	.  error
 
-	expr  goto 27
+	expr  goto 30
 	interpolation  goto 5
 	literal  goto 4
 	literalModeTop  goto 11
 	literalModeValue  goto 3
 
-state 27
+state 29
+	expr:  IDENTIFIER SQUARE_BRACKET_LEFT expr SQUARE_BRACKET_RIGHT.    (16)
+
+	.  reduce 16 (src line 161)
+
+
+state 30
 	expr:  expr.ARITH_OP expr 
-	args:  args COMMA expr.    (17)
+	args:  args COMMA expr.    (18)
 
 	ARITH_OP  shift 17
-	.  reduce 17 (src line 165)
+	.  reduce 18 (src line 177)
 
 
-15 terminals, 8 nonterminals
-20 grammar rules, 28/2000 states
+17 terminals, 8 nonterminals
+21 grammar rules, 31/2000 states
 0 shift/reduce, 0 reduce/reduce conflicts reported
 57 working sets used
-memory: parser 40/30000
-23 extra closures
-57 shift entries, 1 exceptions
-15 goto entries
-27 entries saved by goto default
-Optimizer space used: output 34/30000
-34 table entries, 2 zero
-maximum spread: 15, maximum offset: 26
+memory: parser 45/30000
+26 extra closures
+67 shift entries, 1 exceptions
+16 goto entries
+31 entries saved by goto default
+Optimizer space used: output 37/30000
+37 table entries, 1 zero
+maximum spread: 17, maximum offset: 28