Don't drop actions depending on shrunk predecessors. #1
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Closes hedgehogqa#448. Suppose we have an Action list A 1 -> Var 0 B (Var 0) -> ... Then when we shrink A, we would previously get the list A 0 -> Var 1 B (Var 0) -> ... And then we'd drop B from this list, because `Var 0` no longer exists. Now shrinking will give A 0 -> Var 0 B (Var 0) -> ... which is fine. This means we now generate Vars even for actions whose `Require` fails.
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Upstream: hedgehogqa#453
Closes hedgehogqa#448. Suppose we have an Action list
Then when we shrink A, we would previously get the list
And then we'd drop B from this list, because
Var 0no longer exists.Now shrinking will give
which is fine.
This means we now generate Vars even for actions whose
Requirefails.