Make sure z to be not nil
#100
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`Digraph#traverse` push argment first. This means while loop stops before stack to be empty because it will be break if argment is popped. Checking the result of `@stack.pop` in while condition expr, so that we can ensure `z` to be not nil on semantics level.
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This is a follow up of #99. |
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Digraph#traversepush argment first. This means while loop stops before stack to be empty because it will be break if argment is popped. Checking the result of@stack.popin while condition expr, so that we can ensurezto be not nil on semantics level.