Parse empty tablet symbol - #142
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We had a notion of an empty tablet in the runtime, signified by
[=]but didn't actually have support for it in the compiler's parser.Adding this should have been straight forward, but it forced us to deal with the difference between lists and tablets a bit more systematically. The previous approach of representing a tablet as a list of pairs was cute, but dealing with them properly actually simplified the code.
The literal
[=]is now supported by the Technique compiler.