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deque-blog/dsl_arithmetic_1_enhanced_eval_test.hs

Created January 17, 2017 17:37
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dsl_arithmetic_1_enhanced_eval_test.hs
> let e = add [ cst(1)
, cst(2)
, mul [cst(0), var("x"), var("y")]
, mul [cst(1), var("y"), cst(2)]
, add [cst(0), var("x") ]]
> let env = Map.fromList [("x", 1)]
> eval' env e
*** Exception: Missing vars: fromList ["y"]
> eval' Map.empty e
*** Exception: Missing vars: fromList ["x","y"]
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