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Merge upstream - #115
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Add support for ~ and ~_ relation symbols (sim and sim_). To avoid a grammar ambiguity between unary logical negation (~ e) and prefix relations without a left-hand side, introduce relop_prefix which excludes ~. In infix position (e1 ~ e2), ~ is parsed as a binary relation (Atom.Sim), while in prefix position (~ e), ~ remains parsed as unary negation (unop).
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