Failing test-case #1: ./test -n -a -n
fails and outputs ./test: extra argument ‘-n’ Expected behaviour is silent success, as seen in Bash's implementation. Explanation: -a has higher precedence than -n. Therefore the test is equivalent to ./test -n && ./test -n. ./test -n shall succeed because it is not an operator, but rather a non-empty string. Failing test-case #2: ./test ! '' -a '' shall fail (exit value 1), but in this implementation it succeeds. Explanation: ! has higher precedence than -a, therefore the test shall be equivalent to ./test ! '' && ./test '', not ! ./test '' -a ''.
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