On Wed, Feb 17, 2021 at 12:52 AM Bakul Shah <bakul@iitbombay.org> wrote:
The goto operator is "-> label", while assignment is "var <- value"

I overstated the case.  However, goto is in fact "-> expression", where expression is an integer scalar referring to a line (implicitly numbered from 1 upwards) of the current definition; a goto to  a nonexistent line such as 0 exits the current definition or program.  Labels were added later, and are essentially local variables bound to the line number they appear on.  Modern APL uses structured-programming constructs like all other post-Ratfor languages.

John Cowan          http://vrici.lojban.org/~cowan        cowan@ccil.org
One of the oil men in heaven started a rumor of a gusher down in hell.  All
the other oil men left in a hurry for hell.  As he gets to thinking about
the rumor he had started he says to himself there might be something in
it after all.  So he leaves for hell in a hurry.    --Carl Sandburg