:COME FROM: /n./ A semi-mythical language construct dual to the
`go to'; `COME FROM' would cause the referenced label
to act as a sort of trapdoor, so that if the program ever reached
it control would quietly and {automagically} be transferred to
the statement following the `COME FROM'. `COME FROM'
was first proposed in R. Lawrence Clark's "A Linguistic
Contribution to GOTO-less programming", which appeared in a 1973
{Datamation} issue (and was reprinted in the April 1984 issue of
"Communications of the ACM"). This parodied the then-raging
`structured programming' {holy wars} (see {considered
harmful}). Mythically, some variants are the `assigned COME
FROM' and the `computed COME FROM' (parodying some nasty control
constructs in FORTRAN and some extended BASICs). Of course,
multi-tasking (or non-determinism) could be implemented by having
more than one `COME FROM' statement coming from the same
label.

In some ways the FORTRAN `DO' looks like a `COME FROM'
statement. After the terminating statement number/`CONTINUE'
is reached, control continues at the statement following the DO.
Some generous FORTRANs would allow arbitrary statements (other than
`CONTINUE') for the statement, leading to examples like:

DO 10 I=1,LIMIT
C imagine many lines of code here, leaving the
C original DO statement lost in the spaghetti...
WRITE(6,10) I,FROB(I)
10 FORMAT(1X,I5,G10.4)

in which the trapdoor is just after the statement labeled 10.