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let
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f = "f";
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o = "o";
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b = "b";
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func = {a ? f, b ? "a", c ? ""}: a+b+c; #only modify this line!
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in
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rec {
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foo = func {b="o"; c=o;}; #must evaluate to "foo"
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bar = func {a=b; c="r";}; #must evaluate to "bar"
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foobar = func {a=foo;b=bar;}; #must evaluate to "foobar"
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}
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