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>>>>> "Tom" == Tom Lord <lord@xxxxxxx> writes: Tom> The SRFI is slightly unclear but I understand the section "Signalling Tom> errors from external code" to mean that a call to something like Tom> SCHEME_ARGUMENT_TYPE_ERROR does not return to its caller, but rather Tom> directly to Scheme. Tom> I gather also that SCHEME_CALL may result in a non-local exit past the Tom> caller. Correct. Tom> Since the mechanism of these non-local exits is not specified and can Tom> not be modified by C code, the FFI contains no provision for them to Tom> perform unwind protection --- that's a serious omission. But SCHEME_CALL takes you back to Scheme, where you can use DYNAMIC-WIND. I think I misunderstand your point. -- Cheers =8-} Mike Friede, Völkerverständigung und überhaupt blabla