One of the concepts migrated to later metasyntaxes was the idea that giving the user multiple choices made it harder to write parsers for grammars defined by the syntax .
Computer languages in general have become more restrictive in how a quoted - literal is defined .
One of the concepts migrated to later metasyntaxes was the idea that giving the user multiple choices made it harder to write parsers for grammars defined by the syntax , so computer languages in general have become more restrictive in how a quoted - literal is defined .