PL/I has the data types label constant and label variable and of
course permits them to be passed as arguments. (The PL/I mapping of
{formal parameter, actual parameter} is {parameter, argument}.) I
use such a label in, for example, a routine that searches a binary
tree recursively With success, however defined, control is returned
from the block/recursive invocation in which it occurs directly to the
instance of the label in the block from which the search entry was
first invoked, the stack being cleaned appropriately.
John Gilmore, Ashland, MA 01721 - USA
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