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> So call-with-current-continuation can only be unexpensive in scheme implemen- > tations that are not based on a C-written library, but implement themselves? It's more like: it's difficult to make call/cc efficient if you want functions written in C to be able to call functions written in Scheme and vice versa. You can do it, but then the C code has to be really twisted. Whether the implementation is written in C or not isn't so important.