Are you looking at the right "i" in the debugger? Since you reused the 
block argument name, there are two i's showing in the debugger. The 
first is 6 because that's how the first loop ended - when i was > 5. The 
second i will be the one for the second loop.

Cheers,
Bob


On 3/4/13 9:28 PM, R. Clayton wrote:
> I have an SUnit test:
>
>    testTriangle
>
>      | b n t |
>
>        b := Bag new
>      . n := 5
>
>      . 1 to: n do: [ :i |
>          i timesRepeat: [
>            b add: (IntervalTreeInterval from: i to: i + 1)
>            ]
>          ]
>      . t := IntervalTree withIntervals: b
>
>      . Transcript show: 'Start testing' ; cr
>      . 0 to: n do: [ :i |
>          b := t intervalsContaining: i + 0.5
>        . Transcript show: i ; cr ; flush
>        . self assert: b size = i
>        ]
>
> If I run this method with the last statement commented out (that is, without
> the assertion), the transcript shows
>
>    Start testing
>    0
>    1
>    2
>    3
>    4
>    5
>
> If I run the test with the last statement enabled (that is, with the
> assertion), the transcript shows
>
>    Start testing
>    0
>    1
>    2
>
> and testTriangle fails.  However, in the debugger I find that i is 6 and the
> bag b is empty, which is correct because there are no intervals containing 6.5
> (which makes the assertion fail the correct thing to do).  My question is: why
> is i = 6?  I would have expected the loop to stop after i = 5, as it did when
> there was no assertion.
>
> As a secondary question, why did the transcript stop at 2 for the failing test?
> I'm assuming it's a buffering problem, but I would have expected flush to push
> the buffer contents along.
>
> I'm running
>
>    Image
>    -----
>    /home/rclayton/projects/squeak/interval-tree/Squeak4.3.image
>    Squeak4.3
>    latest update: #11864
>    Current Change Set: Unnamed1
>
>    Virtual Machine
>    ---------------
>    /home/squeak-4.3/Contents/Linux-i686/lib/squeak/4.4.7-2357/squeakvm
>    Squeak4.1 of 17 April 2010 [latest update: #9957]
>    Unix built on Jan 23 2011 18:17:32 Compiler: 4.3.2
>    platform sources revision 2357
>    VMMaker versionString 4.4.7
>
>    Operating System/Hardware
>    -------------------------
>    unix linux i686
>
>    Operating System Details
>    ------------------------
>    Debian GNU/Linux 7.0 \n \l
>
>    FileDoesNotExistException: '/etc/lsb-release'Linux version 3.2.0-4-686-pae
>    (debian-kernel at lists.debian.org) (gcc version 4.6.3 (Debian 4.6.3-14) ) #1
>    SMP Debian 3.2.35-2
>
>
>

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