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This branch is WIP towards a fairly non-standard syntax for natural deduction,
there is some examples, which augment the traditional natural deduction inference rules with placeholder the syntax, and some proofs in that syntax
It removes the existing AST while working on the parser since its a pain to fiddle with.
Natural deduction is weird, because it's got 'mid-line' which is some n-ary operator, and case expressions, also a n-ary operator.
It should be noted that this is not producing a very usable form of parse tree, hence experiment.
This is an attempt to use the
therefore sign ∴,
case analysis is done with '▸'.
'.' for discharge.
adds new tests
fix old tests for existing parser.
add new ast?
produces a nice usable parse tree?