Hello!
What is a "hole"?
This program fails to compile:
main = _exit 0
I get this error message:
ex.hs:1:8:
Found hole ‘_exit’ with type: t
Where: ‘t’ is a rigid type variable bound by
the inferred type of main :: t at ex.hs:1:1
Relevant bindings include main :: t (bound at ex.hs:1:1)
In the expression: _exit
In an equation for ‘main’: main = _exit
When I replace "_exit" with "foo", it produces a "not in scope" error, as
expected. What is special about "_exit"? It doesn't occur in the Haskell
Hierarchical Libraries.
Bye
Volker
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