shellcheck: test_rust.sh issues
In test_rust.sh line 19:
"${CARGO:-cargo}" test ${CARGO_ONLINE-"--frozen"} \
^-- SC2086: Double quote to prevent globbing and word splitting.
In test_rust.sh line 21:
--target $rustc_host \
^-- SC2086: Double quote to prevent globbing and word splitting.
In test_rust.sh line 22:
${EXTRA_CARGO_OPTIONS} \
^-- SC2086: Double quote to prevent globbing and word splitting.