[mercury-users] Debug messages

[Ian MacLarty]

On 18 Feb 2005, at 01:11, Elmar Haneke wrote:

> Hi,
>
> how can I make my program output some trace-data without using the 
> io_state?
>
> For debugging pruposes it is very much more convenient to place an 
> 'print("Was here")' to some code where no IO-state is passed or IO is 
> not possible due to backtracking..
>

Have you tried using the debugger?  It gives you more control than just 
inserting print statements - for example you can insert conditional 
breakpoints, retry already executed goals if you go to far, or browse 
large terms interactively.

Ian.

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