Finish special operators #7
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karlosz put it in early on but it had never been much tested, as Clasp does not use it yet.
Like CATCH, the instruction has been there, but was not used. Having UNBIND work on both PROGV and SPECIAL-BIND environments might be mildly annoying for a shallow binding implementation that might have to distinguish between two kinds of dynenvs. But at least it should be implementable.
That's all the standard special operators. An alternative design would be to inline the cleanup, and have the PROTECT instruction refer to a label. The cleanup would then end with a special resume instruction, that would either continue unwinding, or jump back to whatever local exit caused the cleanup. But that would be really complicated. Originally I was going to call the cleanup instruction "deprotect" as a chemistry joke, but I figure deprotect sounds like it's merely removing protection, rather than actually doing things.
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Implements
progv,catch,throw, andunwind-protect, and adds new ANSI tests for them. The first three were semi-implemented but not tested, and the last was not implemented at all. With these changes, the compiler handles all standard special operators.