list x = ["A", "B", "C"];
string y;
default
{
state_entry()
{
y = llDumpList2String(x, ","); // sep char
llSay(0, y);
x = llDeleteSubList(x, -1, -1);
y = llDumpList2String(x, ","); // sep char
llSay(0,y);
}
}

produces "A, B, C" and should produce "A, B" for the second output line.

ok,

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reference http://bugs.meta7.com/view.php?id=185