That's pretty vague, but there's a better way of stating this - warnings are problems that don't prevent the parser from continuing to parse.

这样的定义是很模糊的。但是有一种更好的规定方法—警告表示不会阻止解析器继续解析的问题。

youdao

Module availability: Parse: : RecDescent may not be available, due to OS or system administration problems.

模块可用性：由于OS或系统管理问题，Parse： RecDescent可能不可用。

youdao

One expert on air traffic, Daniel A. Baker, a spokesman for FlightAware of Houston, said that it was always difficult to parse what had caused delays, but that some appeared to be coming from staffing problems.

FORBES: Flights Delayed Amid Furloughs Of Air Controllers