The "readme" file of the mini-Prolog interpreter says:
Unfortunately, typing a control C to interrupt a query with an infinite loop
will exit the Prolog interpreter completely -- sorry, but I don't know a way
around this at the moment.
-- A way to implement this, it seems me, is to design Hugs so that a ^C
generates a Haskell exception; an unhandled exception should then cause an
interrupt.
This way, it becomes possible for a program to handle an interrupt without
exiting.
Hans Aberg
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