Permit tests for the null string in arbitrary positions in the argument list, not just at the end (the null string test is a crock; why couldn't we just have -n string?). Added test to ensure that t
Permit tests for the null string in arbitrary positions in the argument list, not just at the end (the null string test is a crock; why couldn't we just have -n string?). Added test to ensure that the argument list is exhausted when the expression has been parsed. Made some lint hacks.
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