/* ***************************************** * * Your job is to finish the three functions below that model the derivation step * (in our big-step semantics from the slides in class) of the =>_A, =>_B, and =>_C * step functions. interp_A takes an arithmetic expression, like {form: ‘x’, x: ‘z’}, * and a state/store, like (x) => {if (x == ‘z’) return 7;}, and yields a number, like 7. * interp_B takes a boolean expression and a store to
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