vprat

For comparison, [Ohm](https://ohmjs.org/docs/syntax-reference#lookahead-) says lookahead is _usually_ used as part of a sequence, but it is not mandatory. Indeed, the string `"b"` is parsed by the following grammar in the...

We had a grammar where this occurred. Eventually, we managed to rewrite it to avoid the problem, but I am not sure this is always possible.