Did the same thing to interfaces

parser/face.go

@@ -32,7 +32,7 @@ func (parser *ParsingOperation) parseFaceSection () (
 	if err != nil { return }
 	err = parser.nextToken(lexer.TokenKindName)
 	if err != nil { return }
-	section.inherits = parser.token.Value().(string)
+	section.inherits, err = parser.parseIdentifier()
 	if err != nil { return }
 	err = parser.nextToken(lexer.TokenKindNewline)
 	if err != nil { return }

parser/tree-tostring.go

@@ -367,7 +367,7 @@ func (section *FaceSection) ToString (indent int) (output string) {
 		"face ",
 		section.permission.ToString(), " ",
 		section.name, ":",
-		section.inherits, "\n")
+		section.inherits.ToString(), "\n")
 
 	for _, name := range sortMapKeysAlphabetically(section.behaviors) {
 		behavior := section.behaviors[name]

parser/tree.go

@@ -190,7 +190,6 @@ type ObjtSection struct {
 	location file.Location
 	name     string
 
-	// TODO: make this Identifier instead of Type
 	inherits     Identifier
 	permission   types.Permission
 	// TODO: order matters here we need to store these in an array
@@ -226,8 +225,7 @@ type FaceBehavior struct {
 type FaceSection struct {
 	location file.Location
 	name     string
-	// TODO: make this Identifier instead of string
-	inherits string
+	inherits Identifier
 	
 	permission types.Permission
 	behaviors  map[string] FaceBehavior