fetch test: use more robust test for filtered objects

[git] / t / chainlint / arithmetic-expansion.test

(
        foo &&
# LINT: closing ")" of $((...)) not misinterpreted as subshell-closing ")"
        bar=$((42 + 1)) &&
        baz
) &&
(
# LINT: missing "&&" on $((...))
        bar=$((42 + 1))
        baz
)