probinson added a comment. We had the same thing happen downstream. One of our guys speculates that because some allocations are "owned" by the returned TokenStream, but the returned TokenStream is a temporary, the lifetimes might not be sufficient and some deallocations can happen. If I change the nested calls `stripComments(cook(lex(Code, Opts), Opts))` to separate calls stored to separate locals, the problem goes away.
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