vendor: upgrade github.com/hashicorp/hcl2

This includes a fix to the dynamic block extension so that nested dynamic
blocks can iterate over the temporary variables created by their ancestors.

go.mod

@@ -72,7 +72,7 @@ require (
 	github.com/hashicorp/go-version v1.0.0
 	github.com/hashicorp/golang-lru v0.5.0 // indirect
 	github.com/hashicorp/hcl v0.0.0-20170504190234-a4b07c25de5f
-	github.com/hashicorp/hcl2 v0.0.0-20181219235215-291f7fbe431d
+	github.com/hashicorp/hcl2 v0.0.0-20181220012050-6631d7cd0a68
 	github.com/hashicorp/hil v0.0.0-20170627220502-fa9f258a9250
 	github.com/hashicorp/logutils v0.0.0-20150609070431-0dc08b1671f3
 	github.com/hashicorp/memberlist v0.1.0 // indirect

go.sum

@@ -171,6 +171,8 @@ github.com/hashicorp/hcl2 v0.0.0-20181219223929-62acf2ce821d h1:sd9/19rMHTRn7UTY
 github.com/hashicorp/hcl2 v0.0.0-20181219223929-62acf2ce821d/go.mod h1:ShfpTh661oAaxo7VcNxg0zcZW6jvMa7Moy2oFx7e5dE=
 github.com/hashicorp/hcl2 v0.0.0-20181219235215-291f7fbe431d h1:/htY6cNUFEn929uHLoI/5rYUHcaKLXZpbE6zEOymf78=
 github.com/hashicorp/hcl2 v0.0.0-20181219235215-291f7fbe431d/go.mod h1:ShfpTh661oAaxo7VcNxg0zcZW6jvMa7Moy2oFx7e5dE=
+github.com/hashicorp/hcl2 v0.0.0-20181220012050-6631d7cd0a68 h1:d2VhAXrdo8KXWFsn8lNHp5IL0OUXmXMIIlcZBmZa1iU=
+github.com/hashicorp/hcl2 v0.0.0-20181220012050-6631d7cd0a68/go.mod h1:ShfpTh661oAaxo7VcNxg0zcZW6jvMa7Moy2oFx7e5dE=
 github.com/hashicorp/hil v0.0.0-20170627220502-fa9f258a9250 h1:fooK5IvDL/KIsi4LxF/JH68nVdrBSiGNPhS2JAQjtjo=
 github.com/hashicorp/hil v0.0.0-20170627220502-fa9f258a9250/go.mod h1:KHvg/R2/dPtaePb16oW4qIyzkMxXOL38xjRN64adsts=
 github.com/hashicorp/logutils v0.0.0-20150609070431-0dc08b1671f3 h1:oD64EFjELI9RY9yoWlfua58r+etdnoIC871z+rr6lkA=

vendor/github.com/hashicorp/hcl2/ext/dynblock/expand_body.go

@@ -234,7 +234,8 @@ func (b *expandBody) expandBlocks(schema *hcl.BodySchema, rawBlocks hcl.Blocks,
 }
 
 func (b *expandBody) expandChild(child hcl.Body, i *iteration) hcl.Body {
-	ret := Expand(child, b.forEachCtx)
+	chiCtx := i.EvalContext(b.forEachCtx)
+	ret := Expand(child, chiCtx)
 	ret.(*expandBody).iteration = i
 	return ret
 }

vendor/github.com/hashicorp/hcl2/ext/dynblock/expand_spec.go

@@ -41,11 +41,14 @@ func (b *expandBody) decodeSpec(blockS *hcl.BlockHeaderSchema, rawSpec *hcl.Bloc
 	eachVal, eachDiags := eachAttr.Expr.Value(b.forEachCtx)
 	diags = append(diags, eachDiags...)
 
-	if !eachVal.CanIterateElements() {
+	if !eachVal.CanIterateElements() && eachVal.Type() != cty.DynamicPseudoType {
+		// We skip this error for DynamicPseudoType because that means we either
+		// have a null (which is checked immediately below) or an unknown
+		// (which is handled in the expandBody Content methods).
 		diags = append(diags, &hcl.Diagnostic{
 			Severity:    hcl.DiagError,
 			Summary:     "Invalid dynamic for_each value",
-			Detail:      fmt.Sprintf("Cannot use a value of type %s in for_each. An iterable collection is required.", eachVal.Type()),
+			Detail:      fmt.Sprintf("Cannot use a %s value in for_each. An iterable collection is required.", eachVal.Type().FriendlyName()),
 			Subject:     eachAttr.Expr.Range().Ptr(),
 			Expression:  eachAttr.Expr,
 			EvalContext: b.forEachCtx,

vendor/github.com/hashicorp/hcl2/ext/dynblock/iteration.go

@@ -30,12 +30,14 @@ func (i *iteration) Object() cty.Value {
 
 func (i *iteration) EvalContext(base *hcl.EvalContext) *hcl.EvalContext {
 	new := base.NewChild()
-	new.Variables = map[string]cty.Value{}
 
+	if i != nil {
+		new.Variables = map[string]cty.Value{}
 		for name, otherIt := range i.Inherited {
 			new.Variables[name] = otherIt.Object()
 		}
 		new.Variables[i.IteratorName] = i.Object()
+	}
 
 	return new
 }

vendor/modules.txt

@@ -351,7 +351,7 @@ github.com/hashicorp/hcl/hcl/scanner
 github.com/hashicorp/hcl/hcl/strconv
 github.com/hashicorp/hcl/json/scanner
 github.com/hashicorp/hcl/json/token
-# github.com/hashicorp/hcl2 v0.0.0-20181219235215-291f7fbe431d
+# github.com/hashicorp/hcl2 v0.0.0-20181220012050-6631d7cd0a68
 github.com/hashicorp/hcl2/hcl
 github.com/hashicorp/hcl2/hcl/hclsyntax
 github.com/hashicorp/hcl2/hcldec