PIR did parse since quite a time instructions like:
$I0 = defined $P0
but these were handled with explicite rules. And I found me often writing:
len = length $S0
which wasn't a valid syntax.
I've now tossed the special handling of defined and clone. Instead PIR
lhs = PARROT_OP args
so these instructions:
$I0 = defined a
are now (amongst many more) valid PIR syntax. There are currently no
PARROT_OP lhs[, args]
So you can write:
$I0 = add 10, 20
where it really gets ugly. We could of course limit this syntax to more
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