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drvPath=$($TOP/src/nix-instantiate/nix-instantiate fallback.nix)
echo "derivation is $drvPath"
outPath=$($TOP/src/nix-store/nix-store -q --fallback "$drvPath")
echo "output path is $outPath"
# Register a non-existant substitute
(echo $outPath && echo "" && echo $TOP/no-such-program && echo 0 && echo 0) | $TOP/src/nix-store/nix-store --substitute
# Build the derivation
$TOP/src/nix-store/nix-store -r --fallback "$drvPath"
text=$(cat "$outPath"/hello)
if test "$text" != "Hello World!"; then exit 1; fi
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