Something I missed. Right in the middle of a self-compile a whopping 15M chars are allocated in the heap (must be the result of an int_to_char conversion). That means about 32 * 15MB = 480MB of data is just sitting there whereas they should have been constants outside of the heap.
Moreover, almost every char is part of a list, which roughly means 48 bytes extra, and stop-and-copy means a factor two overhead too. So, the full formula is 2 * (32B + 48B) * 15M = 2.4GB....
Of course, this is bad news. The good news is that there should be an easy fix.
(Updated. I missed the line with 15MB of characters.)
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