This depends on the parser implementation. For example, https://github.com/yorickpeterse/ruby-ll https://github.com/yorickpeterse/ruby-ll lets you customize the

This depends on the parser implementation. For example, https://github.com/yorickpeterse/ruby-ll https://github.com/yorickpeterse/ruby-ll lets you customize the error messages as the default ones can be a little bit confusing at times. An example of this is https://github.com/YorickPeterse/oga/blob/0fd6fd8645e57ea4b2c29264d498b9bccbb43a04/lib/oga/xml/parser.rll#L268-L284 https://github.com/YorickPeterse/oga/blob/0fd6fd8645e57ea4b2... which changes messages from "unexpected T_FOO, expected T_BAR" to "unexpected end of input, expected element closing tag". Having said that, a hand written parser _will_ beat LL(1) (or any parser generator for that matter) when it comes to error reporting, though this depends on the amount of effort a programmer put in to the error reporting.