Just an arbitrary newbie question...
I note that the updated UnaryExpression BNF
codifies part of the behaviour of ES-262 implementations:
UnaryExpression ->
PostfixExpression
| delete PostfixExpression
| void UnaryExpression
| typeof UnaryExpression
| ++ PostfixExpression
| -- PostfixExpression
| + UnaryExpression
| - UnaryExpression
(etc)
So ++++a is ruled out at syntax level, and -++a is legal while ++-a isn't.
This matches (part of) behaviour of current implementations.
But is ++a++ going to become legal?
In IE ++a++ etc are reported as runtime errors.
Seamonkey code goes directly to MemberExpression after matching ++/--,
is this the intention? If so, why not in spec?
More generally, is there a reason for deferring to runtime
if it is knowable at parse time that a construct is anyway going to be an error?
(I'm thinking of detail issues like the above, but have no particular
examples at hand where seamonkey defers to runtime)
Thanks,
re
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