hcl/parser: error on bare object keys in object

hcl/parser/parser.go

@@ -128,6 +128,13 @@ func (p *Parser) objectItem() (*ast.ObjectItem, error) {
 		// receive a value (but we did receive a key) for the item.
 		err = nil
 	}
+	if len(keys) > 0 && err != nil && p.tok.Type == token.RBRACE {
+		// Object key with no value in an object
+		err = nil
+
+		// Reset the token type so we don't think it completed fine.
+		p.tok.Type = token.EOF
+	}
 	if err != nil {
 		return nil, err
 	}
@@ -215,7 +222,7 @@ func (p *Parser) objectKey() ([]*ast.ObjectKey, error) {
 		case token.ILLEGAL:
 			fmt.Println("illegal")
 		default:
-			return nil, &PosError{
+			return keys, &PosError{
 				Pos: p.tok.Pos,
 				Err: fmt.Errorf("expected: IDENT | STRING | ASSIGN | LBRACE got: %s", p.tok.Type),
 			}

hcl/parser/parser_test.go

@@ -311,6 +311,10 @@ func TestParse(t *testing.T) {
 			"key_without_value.hcl",
 			true,
 		},
+		{
+			"object_key_without_value.hcl",
+			true,
+		},
 	}
 
 	const fixtureDir = "./test-fixtures"

hcl/parser/test-fixtures/object_key_without_value.hcl

@@ -0,0 +1,3 @@
+foo {
+  bar
+}