Repaired a fatal compiler error in the debug build: it's not clear what
this was trying to assert, but the name it referenced didn't exist.
diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index 6b37b31..b1a9ee1 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -503,7 +503,7 @@
if (!check_bom(buf_getc, buf_ungetc, buf_setreadl, tok))
return NULL;
str = tok->str; /* string after BOM if any */
- assert(r);
+ assert(str);
if (tok->enc != NULL) {
utf8 = translate_into_utf8(str, tok->enc);
if (utf8 == NULL)