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(OBSOLETE) A B Compiler for x86

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e.g. fnord -1; ...produces a syntax error. (Because the CON token only matches positive numbers.) What I did in my copy was to add a special case in `extdef()`: https://github.com/davidgiven/ack/commit/8b8910595a4f1652265737a0d8efd931c3e7d201#diff-001711b0da5eb4e0fdb5dd4d0bb2bcfc

It seems the PDP-11 version of B supported ~ and ^ --- I added support to my copy, mainly because I wanted to test code generation for not and xor....