Tokenizer.Raw is intended to provide the unmodified text of the current token --
http://godoc.org/code.google.com/p/go.net/html#Tokenizer.Raw
But, when a tokenization error occurs, the raw text may be duplicated. For example:
z := NewTokenizer(strings.NewReader("foo bar"))
tt := z.Next()
fmt.Printf("%v: %q\n", tt, string(z.Raw()))
tt = z.Next()
fmt.Printf("%v: %q\n", tt, string(z.Raw()))
duplicates "foo bar" in both a text and error token:
Text: "foo bar"
Error: "foo bar"
The concatenated results of z.Raw() should reproduce the original input without
duplication.
The fix is adjust the way Next updates the raw and data spans. I'll send a change for
this shortly.
