The file Parser.cc, line 476, looks like this:
const int funtag = tos[src].get_tag() & ~TC_MASK | TC_FUN12;
Because & binds stronger than |, the compiler parses this as:
const int funtag = (tos[src].get_tag() & ~TC_MASK) | TC_FUN12;
I believe this is incorrect, and the intention is this instead:
const int funtag = tos[src].get_tag() & (~TC_MASK | TC_FUN12);
Even if the former is the intended form, I suggest adding parentheses to clarify this (enabling full warnings emits a warning about this).
Regards,
Elias