You can just read the internals, but that doesn't mean that the criticism is wrong. Certain problems do suggest deeper internal issues. "Good error messages co

You can just read the internals, but that doesn't mean that the criticism is wrong. Certain problems do suggest deeper internal issues. "Good error messages cost a lot" and "They turned off yacc's 'produce better error messages' mode" seem to contradict one another. And no, in a lot of cases the parser emits weird error messages because the internal variables are named weird things. If you're telling me it's unreasonably difficult for PHP to produce a better error message than "Unexpected CONSTANT_NAME" than why name your constants unintuitively?