cases:

    "move var":
        after:
            set mapvar("x"): arr: 1 2 0 F
            move mapvar("x"): 10 20
            assert debug: == mapvar("x") arr: 11 22 0 F

    "rot var":
        after:
            set mapvar("x"): arr: 1 2 0 F
            rot mapvar("x"): 3
            assert debug: == mapvar("x") arr: 1 2 3 F

    "turn var":
        after:
            set mapvar("x"): arr: 1 2 0 F
            turn mapvar("x")()
            assert debug: == mapvar("x") arr: 1 2 0 T

    "while":
        after:
            set mapvar("x"): 0
            while:
                expr: < mapvar("x") 5
            do:
                inc mapvar("x")
            assert: == mapvar("x") 5