Implemented for loops

src/token/Kind.go

@@ -69,6 +69,7 @@ const (
 	Const                             // const
 	Else                              // else
 	Extern                            // extern
+	For                               // for
 	If                                // if
 	Import                            // import
 	Loop                              // loop

src/token/Tokenize_test.go

@@ -25,15 +25,16 @@ func TestFunction(t *testing.T) {
 }
 
 func TestKeyword(t *testing.T) {
-	tokens := token.Tokenize([]byte("assert const if import else extern loop return struct switch"))
+	tokens := token.Tokenize([]byte("assert const else extern if import for loop return struct switch"))
 
 	expected := []token.Kind{
 		token.Assert,
 		token.Const,
-		token.If,
-		token.Import,
 		token.Else,
 		token.Extern,
+		token.If,
+		token.Import,
+		token.For,
 		token.Loop,
 		token.Return,
 		token.Struct,

src/token/identifier.go

@@ -23,6 +23,8 @@ func identifier(tokens List, buffer []byte, i Position) (List, Position) {
 		kind = Else
 	case "extern":
 		kind = Extern
+	case "for":
+		kind = For
 	case "import":
 		kind = Import
 	case "loop":