#3319 lsearch -start inconsistent return

[Anonymous]

The return for
lsearch -start X $list Value
is different when X >= end
and Value is the last or non-last list element.

set l {a b c d a b c d}

lsearch -start 5 $l d
returns 7, as expected
lsearch -start 999 $l d
returns 7
lsearch -start 999 $l c
returns -1

[Donal K. Fellows]

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Any opinion on whether to fix this for 8.4 or 8.5? Or should
it just be closed as "meant to work that way"?

Please assign back to me with the comment.

[Don Porter]

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I would expect that

lsearch -start $x $l $i

with $x an integer would
either return -1 (not found)
or would return an integer
greater than or equal to $x .

[lsearch -start 999 $l d] => 7

goes against my expectations,
and suggests the search did
not start at index 999 as
instructed, but started at
index 7 instead.

This looks like a bug to me,
and as such ought to be fixed
for 8.4.13.

I'm willing to be talked
out of that if this "feature"
enables some particularly
elegant coding of some particularly
useful algorithm. In that case,
I'd want really good documentation.

[Donal K. Fellows]

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Fixed in HEAD and 8.4 branch (looking off the end of a list
always finds nothing)