rust: Allow IN_NIX_SHELL to be undefined
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# Fix 'failed to open: /homeless-shelter/.cargo/.package-cache' in rust 1.36.
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if [[ -z $IN_NIX_SHELL && -z $CARGO_HOME ]]; then
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if [[ -z ${IN_NIX_SHELL-} && -z ${CARGO_HOME-} ]]; then
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export CARGO_HOME=$TMPDIR
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fi
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