Issue #18, but syntax is: foreach (variable) => (expression) {...}.

src/tokenizer/tokenizer.go

@@ -47,7 +47,8 @@ var keywords = []string{
 	"catch",
 	"exitwith",
 	"waituntil",
-	"code"}
+	"code",
+	"in"}
 
 var whitespace = []byte{' ', '\n', '\t', '\r'}
 var identifier = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_"