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Also fix a few shellcheck warnings related to printf while doing so.
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Since Isabelle 2018, specifying the same directory both on the command
line and persistently in the user's ROOTS file is allowed, so we don't
have to choose between one or the other any more.
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Also use zero-initialised memory. Apparently some tests access unitialised
memory, and the default behaviour of the Lem shallow embedding is to fail in
this case.
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Use nondeterministic choice by default instead of a deterministic bitstream
generator in the state, which is slightly awkward to reason about, because
every use of undefined_boolS changes the state. The previous behaviour can be
implemented as Sail code, if desired.
Also add a default implementation of internal_pick that nondeterministically
chooses an element from a list.
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