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The 
construct evaluates x and returns a pair 
. The value of e is 
if the value of x is an exception and 
otherwise. In the former case, v is the payload of the exception. In the latter case, v is the value of x. Some examples read:
The construct is the fourth example in this chapter of a construct which is not eager left-relaying. It is not eager left-relaying because it is not relaying.
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