Removing the space in `a+ +b`?

Waldemar Horwat waldemar at
Fri Jun 28 21:01:25 UTC 2019

On 6/28/19 8:41 AM, Isiah Meadows wrote:
> Currently, the production `a+ +b` requires a space to disambiguate it from the increment operator. However, `a++b` is not itself valid, as the postfix increment cannot be immediately followed by a bare identifier on the same line, nor can a prefix operator be preceded by one on the same line. Could the grammar be amended to include this production and make it evaluate equivalently to `a+ +b`
> AdditionExpression :: AdditionExpression `++` [no LineTerminator here] UnaryExpression

Maybe it could, but the extra complexity really doesn't seem worth it, particularly since you'd need the unusual line terminator restriction to avoid breaking existing code.  Other uses of + don't have line terminator restrictions.


More information about the es-discuss mailing list