change between es-0.84 and es-0.9-alpha1

[rittle@comm.mot.com (Loren James Rittle)]

; p = a || echo y
only prints 'y' under es-0.9-alpha1.

; {p = a; true} || echo y
is the workaround that works the same under both versions of es.

CHANGES from es-0.9-alpha1 said that 'pp = <={p = a}' now assigns a to
pp rather than 0.  I suspect that this change is what is affecting my
usage.

Of course, I didn't use something as simple as 'p = a || echo y' in es
programs.  I did use:
{~ $a test1 &&
  p = big_nasty_expression} ||
{~ $a test2 &&
  p = another_big_nasty_expression} ||
{~ $a test3 &&
  p = another_big_nasty_expression} ||
{default_big_nasty_expression}

as an idiom for a C-style switch statement.  Yes, I now know this thinking
was stylistically bad, thus I converted to a lisp-style 'if' form:
if {~ $a test1} \
     {p = big_nasty_expression} \
   {~ $a test2} \
     {p = another_big_nasty_expression} \
   {~ $a test3} \
     {p = another_big_nasty_expression} \
  {default_big_nasty_expression}

Loren