5898 - strengthen slice-empty? check

Anytime we create a slice, the first check tends to be whether it's empty.
If we handle ill-formed slices here where start > end, that provides a
measure of safety.

In the Mu translator (mu.subx) we often check for a trailing ':' or ','
and decrement slice->end to ignore it. But that could conceivably yield
ill-formed slices if the slice started out empty. Now we make sure we never
operate on such ill-formed slices.

1 files changed, 0 insertions, 0 deletions

diff --git a/apps/calls b/apps/calls
index 05ba61ef..d8e95bcd 100755
--- a/apps/calls
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