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< Existence Tests
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<   All numbers exist
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<   All strings exist
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<   All expressions exist
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<   Blah Exists
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<   Foo Exists
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<   Blooey doesn't exist
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<   Blooey doesn't exist
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<   Blooey doesn't exist (implied)
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<   Blooey doesn't exist (implied negative)
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<   CORRECT boolean test, blooey doesn't exist, testif == 0 so its false
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<   explicit existence test
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< testing not op
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<   Testing not zero
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<   Testing not one
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<   Testing not exist var one
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<   not expression existence test
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<   not expression test
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<   not expression test
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<  array exists test 
< 0
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<  PASS
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< array element exists test
< Mon
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<  PASS
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< array element exists test false
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<  PASS
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