Used to convert a processing error into a parse error so that it looks like the same as other parse errors to tests that search for the "Parse Error" string.
Used to convert a processing error into a parse error so that it looks like the same as other parse errors to tests that search for the "Parse Error" string.
Used to convert a processing error into a unparse error so that it looks like the same as other unparse errors to tests that search for the "Unparse Error" string.
Used to convert a processing error into a unparse error so that it looks like the same as other unparse errors to tests that search for the "Unparse Error" string.
Exception thrown if infoset doesn't have a child corresponding to the slot being probed. E.g., expression evaluation reaching to a forward sibling that has not yet been parsed.