I will take an example:
f x y= x+y
The program ask the user to enter two numbers and print the sum. If
the
user enter "1 2" "f 1 2=3" is stored and a gargage collector is used
to
remove this dandling expression later ?
It's not stored in any way.
If the user enter again "1 2", ghc search in dandling results to
try to find the result without computing it again ?
No, it wouldn't. It would calculate it another time.
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