[Jprogramming] a: is not <$0

[Henry Rich]

The Dictionary defines a: as <$0, but in fact the two are not 
interchangeable.

The challenge is to demonstrate this: write a verb that produces a 
result when applied to a:, but gives domain error when applied to <$0 .

   test a:

   test <$0
|domain error: test
|       test<$0


Then, give a correct definition of a: .

Henry Rich
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