zap-to-char
Now that we have seen how search-forward and progn work,
we can see how the zap-to-char function works as a whole.
The first argument to kill-region is the position of the cursor
when the zap-to-char command is given--the value of point at
that time. Within the progn, the search function then moves
point to just after the zapped-to-character and point returns the
value of this location. The kill-region function puts together
these two values of point, the first one as the beginning of the region
and the second one as the end of the region, and removes the region.
The progn function is necessary because the kill-region
command takes two arguments; and it would fail if search-forward
and point expressions were written in sequence as two
additional arguments. The progn expression is a single argument
to kill-region and returns the one value that kill-region
needs for its second argument.
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