[Newbies] Debug within an error catching block

Clinton Blackmore clinton.blackmore at gmail.com
Sat Dec 11 04:33:57 UTC 2010

That works perfectly in the example code, thank you.

I'm surprised as I thought I'd tried it and I thought that 'error' sends

Putting a 'self halt' in the problem area doesn't bring up the debugger in
my real code.  I suspect now that the function in which I'm trying to put a
breakpoint is not actually being called, and so I'll have to dig deeper to
figure out where the error message I am seeing is coming from.

(Perhaps I'll see if I can find out where the error is being trapped, remove
the trap, and hope to get a debugger in the locus of the problem.)

I appreciate the help.
Clinton Blackmore

On Fri, Dec 10, 2010 at 6:55 PM, Bert Freudenberg <bert at freudenbergs.de>wrote:

> On 10.12.2010, at 16:37, Clinton Blackmore wrote:
> Greetings.
> In one area of code, I need to set a break point and do some debugging.
>  This code is called deeply within a block that is wrapped up so that the
> end user does not see errors that occur.
> In very simplified form, it is like this:
> [ self error: 'Throwing an error' ] ifError: [:err :rcvr | Transcript show:
> 'Trapped error']
> When I 'do it', this example will always trap the error instead of breaking
> into the debugger (which, quit clearly, it is designed to do.)
> While I shudder to think of how easily it could be abused, there is no way
> to break into a debugger anyway, is there (without finding and disabling the
> outer block that is sent ifError)?  Perhaps a hypothetical self
> untrappableError or self bringUpTheDebuggerPlease?
> To set a breakpoint do "self halt":
> [ self halt. self error: 'Throwing an error' ] ifError: [:err :rcvr |
> Transcript show: 'Trapped error']
> - Bert -
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